OpenSSL Security Advisory

[Matt Caswell]

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Hash: SHA256

OpenSSL Security Advisory [27th June 2024]
==

SSL_select_next_proto buffer overread (CVE-2024-5535)
=

Severity: Low

Issue summary: Calling the OpenSSL API function SSL_select_next_proto with an
empty supported client protocols buffer may cause a crash or memory contents to
be sent to the peer.

Impact summary: A buffer overread can have a range of potential consequences
such as unexpected application beahviour or a crash. In particular this issue
could result in up to 255 bytes of arbitrary private data from memory being sent
to the peer leading to a loss of confidentiality. However, only applications
that directly call the SSL_select_next_proto function with a 0 length list of
supported client protocols are affected by this issue. This would normally never
be a valid scenario and is typically not under attacker control but may occur by
accident in the case of a configuration or programming error in the calling
application.

The OpenSSL API function SSL_select_next_proto is typically used by TLS
applications that support ALPN (Application Layer Protocol Negotiation) or NPN
(Next Protocol Negotiation). NPN is older, was never standardised and
is deprecated in favour of ALPN. We believe that ALPN is significantly more
widely deployed than NPN. The SSL_select_next_proto function accepts a list of
protocols from the server and a list of protocols from the client and returns
the first protocol that appears in the server list that also appears in the
client list. In the case of no overlap between the two lists it returns the
first item in the client list. In either case it will signal whether an overlap
between the two lists was found. In the case where SSL_select_next_proto is
called with a zero length client list it fails to notice this condition and
returns the memory immediately following the client list pointer (and reports
that there was no overlap in the lists).

This function is typically called from a server side application callback for
ALPN or a client side application callback for NPN. In the case of ALPN the list
of protocols supplied by the client is guaranteed by libssl to never be zero in
length. The list of server protocols comes from the application and should never
normally be expected to be of zero length. In this case if the
SSL_select_next_proto function has been called as expected (with the list
supplied by the client passed in the client/client_len parameters), then the
application will not be vulnerable to this issue. If the application has
accidentally been configured with a zero length server list, and has
accidentally passed that zero length server list in the client/client_len
parameters, and has additionally failed to correctly handle a "no overlap"
response (which would normally result in a handshake failure in ALPN) then it
will be vulnerable to this problem.

In the case of NPN, the protocol permits the client to opportunistically select
a protocol when there is no overlap. OpenSSL returns the first client protocol
in the no overlap case in support of this. The list of client protocols comes
from the application and should never normally be expected to be of zero length.
However if the SSL_select_next_proto function is accidentally called with a
client_len of 0 then an invalid memory pointer will be returned instead. If the
application uses this output as the opportunistic protocol then the loss of
confidentiality will occur.

This issue has been assessed as Low severity because applications are most
likely to be vulnerable if they are using NPN instead of ALPN - but NPN is not
widely used. It also requires an application configuration or programming error.
Finally, this issue would not typically be under attacker control making active
exploitation unlikely.

The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this issue.

OpenSSL 3.3, 3.2, 3.1, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.

OpenSSL 3.3 users should upgrade to OpenSSL 3.3.2 once it is released.

OpenSSL 3.2 users should upgrade to OpenSSL 3.2.3 once it is released.

OpenSSL 3.1 users should upgrade to OpenSSL 3.1.7 once it is released.

OpenSSL 3.0 users should upgrade to OpenSSL 3.0.15 once it is released.

OpenSSL 1.1.1 users should upgrade to OpenSSL 1.1.1za once it is released
(premium support customers only).

OpenSSL 1.0.2 users should upgrade to OpenSSL 1.0.2zk once it is released
(premium support customers only).

Due to the low severity of this issue we are not issuing new releases of
OpenSSL at this time. The fix will be included in the next releases when they
become available. The fix is also available in commit e86ac436f0 (for 3.3),
commit 99fb785a5f (for 3.2), commit 4ada436a19 (for 3.1) and commit cf6f91f612
(for 3.0) in the OpenSSL git repository. It is available to premium support
customers in commit b78ec0824d (for 1.1.1) 

OpenSSL Security Advisory

[Matt Caswell]

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Hash: SHA256

OpenSSL Security Advisory [28th May 2024]
=

Use After Free with SSL_free_buffers (CVE-2024-4741)


Severity: Low

Issue summary: Calling the OpenSSL API function SSL_free_buffers may cause
memory to be accessed that was previously freed in some situations

Impact summary: A use after free can have a range of potential consequences such
as the corruption of valid data, crashes or execution of arbitrary code.
However, only applications that directly call the SSL_free_buffers function are
affected by this issue. Applications that do not call this function are not
vulnerable. Our investigations indicate that this function is rarely used by
applications.

The SSL_free_buffers function is used to free the internal OpenSSL buffer used
when processing an incoming record from the network. The call is only expected
to succeed if the buffer is not currently in use. However, two scenarios have
been identified where the buffer is freed even when still in use.

The first scenario occurs where a record header has been received from the
network and processed by OpenSSL, but the full record body has not yet arrived.
In this case calling SSL_free_buffers will succeed even though a record has only
been partially processed and the buffer is still in use.

The second scenario occurs where a full record containing application data has
been received and processed by OpenSSL but the application has only read part of
this data. Again a call to SSL_free_buffers will succeed even though the buffer
is still in use.

While these scenarios could occur accidentally during normal operation a
malicious attacker could attempt to engineer a stituation where this occurs.
We are not aware of this issue being actively exploited.

The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this issue.

OpenSSL 1.0.2 is also not affected by this issue.

OpenSSL 3.3, 3.2, 3.1, 3.0 and 1.1.1 are vulnerable to this issue.

OpenSSL 3.3 users should upgrade to OpenSSL 3.3.1 once it is released.

OpenSSL 3.2 users should upgrade to OpenSSL 3.2.2 once it is released.

OpenSSL 3.1 users should upgrade to OpenSSL 3.1.6 once it is released.

OpenSSL 3.0 users should upgrade to OpenSSL 3.0.14 once it is released.

OpenSSL 1.1.1 users should upgrade to OpenSSL 1.1.1y once it is released
(premium support customers only).

Due to the low severity of this issue we are not issuing new releases of
OpenSSL at this time. The fix will be included in the next releases when they
become available. The fix is also available in commit e5093133c3 (for 3.3),
commit c88c3de510 (for 3.2), commit 704f725b96 (for 3.1) and commit b3f0eb0a29
(for 3.0) in the OpenSSL git repository. It is available to premium support
customers in commit f7a045f314 (for 1.1.1).

This issue was reported on 10th April 2024 by William Ahern (Akamai). The fix
was developed by Matt Caswell and Watson Ladd (Akamai).

General Advisory Notes
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20240528.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory [corrected CVE id]

[Tomas Mraz]

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Hash: SHA256

OpenSSL Security Advisory [16th May 2024]
=

Excessive time spent checking DSA keys and parameters (CVE-2024-4603)
=

Severity: Low

Issue summary: Checking excessively long DSA keys or parameters may be very
slow.

Impact summary: Applications that use the functions EVP_PKEY_param_check()
or EVP_PKEY_public_check() to check a DSA public key or DSA parameters may
experience long delays. Where the key or parameters that are being checked
have been obtained from an untrusted source this may lead to a Denial of
Service.

The functions EVP_PKEY_param_check() or EVP_PKEY_public_check() perform
various checks on DSA parameters. Some of those computations take a long time
if the modulus ("p" parameter) is too large.

Trying to use a very large modulus is slow and OpenSSL will not allow using
public keys with a modulus which is over 10,000 bits in length for signature
verification. However the key and parameter check functions do not limit
the modulus size when performing the checks.

An application that calls EVP_PKEY_param_check() or EVP_PKEY_public_check()
and supplies a key or parameters obtained from an untrusted source could be
vulnerable to a Denial of Service attack.

These functions are not called by OpenSSL itself on untrusted DSA keys so
only applications that directly call these functions may be vulnerable.

Also vulnerable are the OpenSSL pkey and pkeyparam command line applications
when using the "-check" option.

The OpenSSL SSL/TLS implementation is not affected by this issue.

The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.

OpenSSL 3.3, 3.2, 3.1 and 3.0 are vulnerable to this issue.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

Due to the low severity of this issue we are not issuing new releases of
OpenSSL at this time. The fix will be included in the next releases when they
become available. The fix is also available in commit 53ea0648 (for 3.3),
commit da343d06 (for 3.2), commit 9c39b385 (for 3.1) and commit 3559e868
(for 3.0) in the OpenSSL git repository.

OSSfuzz first detected and automatically reported this issue on 13th February
2024 using a fuzzer recently added to OpenSSL written by Kurt Roeckx. The fix
was developed by Tomas Mraz.

General Advisory Notes
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20240516.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[Tomas Mraz]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [16th May 2024]
=

Excessive time spent checking DSA keys and parameters (CVE-2023-3446)
=

Severity: Low

Issue summary: Checking excessively long DSA keys or parameters may be very
slow.

Impact summary: Applications that use the functions EVP_PKEY_param_check()
or EVP_PKEY_public_check() to check a DSA public key or DSA parameters may
experience long delays. Where the key or parameters that are being checked
have been obtained from an untrusted source this may lead to a Denial of
Service.

The functions EVP_PKEY_param_check() or EVP_PKEY_public_check() perform
various checks on DSA parameters. Some of those computations take a long time
if the modulus ("p" parameter) is too large.

Trying to use a very large modulus is slow and OpenSSL will not allow using
public keys with a modulus which is over 10,000 bits in length for signature
verification. However the key and parameter check functions do not limit
the modulus size when performing the checks.

An application that calls EVP_PKEY_param_check() or EVP_PKEY_public_check()
and supplies a key or parameters obtained from an untrusted source could be
vulnerable to a Denial of Service attack.

These functions are not called by OpenSSL itself on untrusted DSA keys so
only applications that directly call these functions may be vulnerable.

Also vulnerable are the OpenSSL pkey and pkeyparam command line applications
when using the "-check" option.

The OpenSSL SSL/TLS implementation is not affected by this issue.

The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.

OpenSSL 3.3, 3.2, 3.1 and 3.0 are vulnerable to this issue.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

Due to the low severity of this issue we are not issuing new releases of
OpenSSL at this time. The fix will be included in the next releases when they
become available. The fix is also available in commit 53ea0648 (for 3.3),
commit da343d06 (for 3.2), commit 9c39b385 (for 3.1) and commit 3559e868
(for 3.0) in the OpenSSL git repository.

OSSfuzz first detected and automatically reported this issue on 13th February
2024 using a fuzzer recently added to OpenSSL written by Kurt Roeckx. The fix
was developed by Tomas Mraz.

General Advisory Notes
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20240516.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[OpenSSL]

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Hash: SHA256

OpenSSL Security Advisory [01 November 2022]


X.509 Email Address 4-byte Buffer Overflow (CVE-2022-3602)
==

Severity: High

A buffer overrun can be triggered in X.509 certificate verification,
specifically in name constraint checking. Note that this occurs
after certificate chain signature verification and requires either a
CA to have signed the malicious certificate or for the application to
continue certificate verification despite failure to construct a path
to a trusted issuer. An attacker can craft a malicious email address
to overflow four attacker-controlled bytes on the stack. This buffer
overflow could result in a crash (causing a denial of service) or
potentially remote code execution.

Many platforms implement stack overflow protections which would mitigate
against the risk of remote code execution. The risk may be further
mitigated based on stack layout for any given platform/compiler.

Pre-announcements of CVE-2022-3602 described this issue as CRITICAL.
Further analysis based on some of the mitigating factors described above
have led this to be downgraded to HIGH. Users are still encouraged to
upgrade to a new version as soon as possible.

In a TLS client, this can be triggered by connecting to a malicious
server. In a TLS server, this can be triggered if the server requests
client authentication and a malicious client connects.

OpenSSL versions 3.0.0 to 3.0.6 are vulnerable to this issue.

OpenSSL 3.0 users should upgrade to OpenSSL 3.0.7.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

This issue was reported to OpenSSL on 17th October 2022 by Polar Bear.
The fixes were developed by Dr Paul Dale.

We are not aware of any working exploit that could lead to code execution,
and we have no evidence of this issue being exploited as of the time of
release of this advisory (November 1st 2022).

X.509 Email Address Variable Length Buffer Overflow (CVE-2022-3786)
===

Severity: High

A buffer overrun can be triggered in X.509 certificate verification,
specifically in name constraint checking. Note that this occurs after
certificate chain signature verification and requires either a CA to
have signed a malicious certificate or for an application to continue
certificate verification despite failure to construct a path to a trusted
issuer. An attacker can craft a malicious email address in a certificate
to overflow an arbitrary number of bytes containing the `.' character
(decimal 46) on the stack. This buffer overflow could result in a crash
(causing a denial of service).

In a TLS client, this can be triggered by connecting to a malicious
server. In a TLS server, this can be triggered if the server requests
client authentication and a malicious client connects.

OpenSSL versions 3.0.0 to 3.0.6 are vulnerable to this issue.

OpenSSL 3.0 users should upgrade to OpenSSL 3.0.7.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

This issue was discovered on 18th October 2022 by Viktor Dukhovni while
researching CVE-2022-3602. The fixes were developed by Dr Paul Dale.

We have no evidence of this issue being exploited as of the time of
release of this advisory (November 1st 2022).

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20221101.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[Matt Caswell]

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Hash: SHA256

OpenSSL Security Advisory [11 October 2022]
===

Using a Custom Cipher with NID_undef may lead to NULL encryption (CVE-2022-3358)


Severity: Low

OpenSSL supports creating a custom cipher via the legacy EVP_CIPHER_meth_new()
function and associated function calls. This function was deprecated in OpenSSL
3.0 and application authors are instead encouraged to use the new provider
mechanism in order to implement custom ciphers.

OpenSSL versions 3.0.0 to 3.0.5 incorrectly handle legacy custom ciphers passed
to the EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() and EVP_CipherInit_ex2()
functions (as well as other similarly named encryption and decryption
initialisation functions). Instead of using the custom cipher directly it
incorrectly tries to fetch an equivalent cipher from the available providers.
An equivalent cipher is found based on the NID passed to EVP_CIPHER_meth_new().
This NID is supposed to represent the unique NID for a given cipher. However it
is possible for an application to incorrectly pass NID_undef as this value in
the call to EVP_CIPHER_meth_new(). When NID_undef is used in this way the
OpenSSL encryption/decryption initialisation function will match the NULL cipher
as being equivalent and will fetch this from the available providers. This will
succeed if the default provider has been loaded (or if a third party provider
has been loaded that offers this cipher). Using the NULL cipher means that the
plaintext is emitted as the ciphertext.

Applications are only affected by this issue if they call EVP_CIPHER_meth_new()
using NID_undef and subsequently use it in a call to an encryption/decryption
initialisation function. Applications that only use SSL/TLS are not impacted by
this issue.

OpenSSL 3.0 users should upgrade to OpenSSL 3.0.6.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

This issue was reported to OpenSSL on 9th August 2022 by Chris Rapier of the
Pittsburgh Supercomputing Center. The fix was developed by Matt Caswell.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20221011.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html

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OpenSSL Security Advisory

[OpenSSL]

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Hash: SHA512

OpenSSL Security Advisory [5 July 2022]
===

Heap memory corruption with RSA private key operation (CVE-2022-2274)
=

Severity: High

The OpenSSL 3.0.4 release introduced a serious bug in the RSA
implementation for X86_64 CPUs supporting the AVX512IFMA instructions.
This issue makes the RSA implementation with 2048 bit private keys
incorrect on such machines and memory corruption will happen during
the computation. As a consequence of the memory corruption an attacker
may be able to trigger a remote code execution on the machine performing
the computation.

SSL/TLS servers or other servers using 2048 bit RSA private keys running
on machines supporting AVX512IFMA instructions of the X86_64 architecture
are affected by this issue.

Note that on a vulnerable machine, proper testing of OpenSSL would fail and
should be noticed before deployment.

Users of the OpenSSL 3.0.4 version should upgrade to OpenSSL 3.0.5.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

This issue was reported to OpenSSL on 22nd June 2022 by Xi Ruoyao. The
fix was developed by Xi Ruoyao.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20220705.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html

AES OCB fails to encrypt some bytes (CVE-2022-2097)
===

Severity: MODERATE

AES OCB mode for 32-bit x86 platforms using the AES-NI assembly optimised
implementation will not encrypt the entirety of the data under some
circumstances.  This could reveal sixteen bytes of data that was
preexisting in the memory that wasn't written.  In the special case of
"in place" encryption, sixteen bytes of the plaintext would be revealed.

Since OpenSSL does not support OCB based cipher suites for TLS and DTLS,
they are both unaffected.

This issue affects versions 1.1.1 and 3.0.  It was addressed in the
releases of 1.1.1q and 3.0.5 on the 5th July 2022.

OpenSSL 1.1.1 users should upgrade to 1.1.1q
OpenSSL 3.0 users should upgrade to 3.0.5

This issue was reported to OpenSSL on the 15th June 2022 by Alex
Chernyakhovsky from Google. The fix was developed by Alex Chernyakhovsky,
David Benjamin and Alejandro Sedeño from Google.
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OpenSSL Security Advisory

[Matt Caswell]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [21 June 2022]


The c_rehash script allows command injection (CVE-2022-2068)


Severity: Moderate

In addition to the c_rehash shell command injection identified in
CVE-2022-1292, further circumstances where the c_rehash script does not
properly sanitise shell metacharacters to prevent command injection were
found by code review.

When the CVE-2022-1292 was fixed it was not discovered that there
are other places in the script where the file names of certificates
being hashed were possibly passed to a command executed through the shell.

This script is distributed by some operating systems in a manner where
it is automatically executed.  On such operating systems, an attacker
could execute arbitrary commands with the privileges of the script.

Use of the c_rehash script is considered obsolete and should be replaced
by the OpenSSL rehash command line tool.

This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.

OpenSSL 1.0.2 users should upgrade to 1.0.2zf (premium support customers only)
OpenSSL 1.1.1 users should upgrade to 1.1.1p
OpenSSL 3.0 users should upgrade to 3.0.4

This issue was reported to OpenSSL on the 20th May 2022.  It was found by
Chancen of Qingteng 73lab.  A further instance of the issue was found by
Daniel Fiala of OpenSSL during a code review of the script.  The fix for
these issues was developed by Daniel Fiala and Tomas Mraz from OpenSSL.

Note


OpenSSL 1.0.2 is out of support and no longer receiving public updates. Extended
support is available for premium support customers:
https://www.openssl.org/support/contracts.html

OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind.
The impact of these issues on OpenSSL 1.1.0 has not been analysed.

Users of these versions should upgrade to OpenSSL 3.0 or 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20220621.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[Matt Caswell]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [03 May 2022]
===

The c_rehash script allows command injection (CVE-2022-1292)


Severity: Moderate

The c_rehash script does not properly sanitise shell metacharacters to
prevent command injection.  This script is distributed by some operating
systems in a manner where it is automatically executed.  On such operating
systems, an attacker could execute arbitrary commands with the privileges
of the script.

Use of the c_rehash script is considered obsolete and should be replaced
by the OpenSSL rehash command line tool.

This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.

OpenSSL 1.0.2 users should upgrade to 1.0.2ze (premium support customers only)
OpenSSL 1.1.1 users should upgrade to 1.1.1o
OpenSSL 3.0 users should upgrade to 3.0.3

This issue was reported to OpenSSL on the 2nd April 2022.  It was found by
Elison Niven of Sophos.  The fix was developed by Tomas Mraz from OpenSSL.

OCSP_basic_verify may incorrectly verify the response signing certificate 
(CVE-2022-1343)
=

Severity: Moderate

The function `OCSP_basic_verify` verifies the signer certificate on an OCSP
response. In the case where the (non-default) flag OCSP_NOCHECKS is used then
the response will be positive (meaning a successful verification) even in the
case where the response signing certificate fails to verify.

It is anticipated that most users of `OCSP_basic_verify` will not use the
OCSP_NOCHECKS flag. In this case the `OCSP_basic_verify` function will return
a negative value (indicating a fatal error) in the case of a certificate
verification failure. The normal expected return value in this case would be 0.

This issue also impacts the command line OpenSSL "ocsp" application. When
verifying an ocsp response with the "-no_cert_checks" option the command line
application will report that the verification is successful even though it has
in fact failed. In this case the incorrect successful response will also be
accompanied by error messages showing the failure and contradicting the
apparently successful result.

This issue affects OpenSSL version 3.0.

OpenSSL 3.0 users should upgrade to 3.0.3

This issue was reported to OpenSSL on the 6th April 2022 by Raul Metsma. The fix
was developed by Matt Caswell from OpenSSL.

Incorrect MAC key used in the RC4-MD5 ciphersuite (CVE-2022-1434)
=

Severity: Low

The OpenSSL 3.0 implementation of the RC4-MD5 ciphersuite incorrectly uses the
AAD data as the MAC key. This makes the MAC key trivially predictable.

An attacker could exploit this issue by performing a man-in-the-middle attack to
modify data being sent from one endpoint to an OpenSSL 3.0 recipient such that
the modified data would still pass the MAC integrity check.

Note that data sent from an OpenSSL 3.0 endpoint to a non-OpenSSL 3.0 endpoint
will always be rejected by the recipient and the connection will fail at that
point. Many application protocols require data to be sent from the client to the
server first. Therefore, in such a case, only an OpenSSL 3.0 server would be
impacted when talking to a non-OpenSSL 3.0 client.

If both endpoints are OpenSSL 3.0 then the attacker could modify data being
sent in both directions. In this case both clients and servers could be
affected, regardless of the application protocol.

Note that in the absence of an attacker this bug means that an OpenSSL 3.0
endpoint communicating with a non-OpenSSL 3.0 endpoint will fail to complete the
handshake when using this ciphersuite.

The confidentiality of data is not impacted by this issue, i.e. an attacker
cannot decrypt data that has been encrypted using this ciphersuite - they can
only modify it.

In order for this attack to work both endpoints must legitimately negotiate the
RC4-MD5 ciphersuite. This ciphersuite is not compiled by default in OpenSSL 3.0,
and is not available within the default provider or the default ciphersuite
list. This ciphersuite will never be used if TLSv1.3 has been negotiated. In
order for an OpenSSL 3.0 endpoint to use this ciphersuite the following must
have occurred:

1) OpenSSL must have been compiled with the (non-default) compile time option
   enable-weak-ssl-ciphers

2) OpenSSL must have had the legacy provider explicitly loaded (either through
   application code or via configuration)

3) The ciphersuite must have been explicitly added to the ciphersuite list

4) The libssl security level must have been set to 0 (default is 1)

5) A version of SSL/TLS below TLSv1.3 must have been negotiated

6) Both endpoints must negotiate the RC4-MD5 ciphersuite in preference to any
   others that both endpoints have in common

This issue affects OpenSSL version 3.0.

OpenSSL 3.0 

OpenSSL Security Advisory

[Matt Caswell]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [15 March 2022]


Infinite loop in BN_mod_sqrt() reachable when parsing certificates 
(CVE-2022-0778)
==

Severity: High

The BN_mod_sqrt() function, which computes a modular square root, contains
a bug that can cause it to loop forever for non-prime moduli.

Internally this function is used when parsing certificates that contain
elliptic curve public keys in compressed form or explicit elliptic curve
parameters with a base point encoded in compressed form.

It is possible to trigger the infinite loop by crafting a certificate that
has invalid explicit curve parameters.

Since certificate parsing happens prior to verification of the certificate
signature, any process that parses an externally supplied certificate may thus
be subject to a denial of service attack. The infinite loop can also be
reached when parsing crafted private keys as they can contain explicit
elliptic curve parameters.

Thus vulnerable situations include:

 - TLS clients consuming server certificates
 - TLS servers consuming client certificates
 - Hosting providers taking certificates or private keys from customers
 - Certificate authorities parsing certification requests from subscribers
 - Anything else which parses ASN.1 elliptic curve parameters

Also any other applications that use the BN_mod_sqrt() where the attacker
can control the parameter values are vulnerable to this DoS issue.

In the OpenSSL 1.0.2 version the public key is not parsed during initial
parsing of the certificate which makes it slightly harder to trigger
the infinite loop. However any operation which requires the public key
from the certificate will trigger the infinite loop. In particular the
attacker can use a self-signed certificate to trigger the loop during
verification of the certificate signature.

This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.  It was
addressed in the releases of 1.1.1n and 3.0.2 on the 15th March 2022.

OpenSSL 1.0.2 users should upgrade to 1.0.2zd (premium support customers only)
OpenSSL 1.1.1 users should upgrade to 1.1.1n
OpenSSL 3.0 users should upgrade to 3.0.2

This issue was reported to OpenSSL on the 24th February 2022 by Tavis Ormandy
from Google. The fix was developed by David Benjamin from Google and Tomáš Mráz
from OpenSSL.

Note


OpenSSL 1.0.2 is out of support and no longer receiving public updates. Extended
support is available for premium support customers:
https://www.openssl.org/support/contracts.html

OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind.
It is affected by the issue.

Users of these versions should upgrade to OpenSSL 3.0 or 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20220315.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[Matt Caswell]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [28 January 2022]
===

BN_mod_exp may produce incorrect results on MIPS (CVE-2021-4160)


Severity: Moderate

There is a carry propagation bug in the MIPS32 and MIPS64 squaring
procedure.  Many EC algorithms are affected, including some of the
TLS 1.3 default curves.  Impact was not analyzed in detail, because the
pre-requisites for attack are considered unlikely and include reusing
private keys.  Analysis suggests that attacks against RSA and DSA as
a result of this defect would be very difficult to perform and are
not believed likely.  Attacks against DH are considered just feasible
(although very difficult) because most of the work necessary to deduce
information about a private key may be performed offline.  The amount of
resources required for such an attack would be significant.  However,
for an attack on TLS to be meaningful, the server would have to share
the DH private key among multiple clients, which is no longer an option
since CVE-2016-0701.

This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.0.  It was
addressed in the releases of 1.1.1m and 3.0.1 on the 15th of December 2021. For
the 1.0.2 release it is addressed in git commit 6fc1aaaf3 that is available to
premium support customers only. It will be made available in 1.0.2zc when it is
released.

The issue only affects OpenSSL on MIPS platforms. If that applies then:

OpenSSL 1.0.2 users should apply git commit 6fc1aaaf3 (premium support
customers only)
OpenSSL 1.1.1 users should upgrade to 1.1.1m
OpenSSL 3.0.0 users should upgrade to 3.0.1

This issue was found on the 10th of December 2021 and subsequently fixed
by Bernd Edlinger.

Note


OpenSSL 1.0.2 is out of support and no longer receiving public updates. Extended
support is available for premium support customers:
https://www.openssl.org/support/contracts.html

OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind.
The impact of these issues on OpenSSL 1.1.0 has not been analysed.

Users of these versions should upgrade to OpenSSL 3.0 or 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20220128.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[Matt Caswell]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [14 December 2021]


Invalid handling of X509_verify_cert() internal errors in libssl (CVE-2021-4044)


Severity: Moderate

Internally libssl in OpenSSL calls X509_verify_cert() on the client side to
verify a certificate supplied by a server. That function may return a negative
return value to indicate an internal error (for example out of memory). Such a
negative return value is mishandled by OpenSSL and will cause an IO function
(such as SSL_connect() or SSL_do_handshake()) to not indicate success and a
subsequent call to SSL_get_error() to return the value
SSL_ERROR_WANT_RETRY_VERIFY. This return value is only supposed to be returned
by OpenSSL if the application has previously called
SSL_CTX_set_cert_verify_callback(). Since most applications do not do this the
SSL_ERROR_WANT_RETRY_VERIFY return value from SSL_get_error() will be totally
unexpected and applications may not behave correctly as a result. The exact
behaviour will depend on the application but it could result in crashes,
infinite loops or other similar incorrect responses.

This issue is made more serious in combination with a separate bug in OpenSSL
3.0 that will cause X509_verify_cert() to indicate an internal error when
processing a certificate chain. This will occur where a certificate does not
include the Subject Alternative Name extension but where a Certificate Authority
has enforced name constraints. This issue can occur even with valid chains.

By combining the two issues an attacker could induce incorrect, application
dependent behaviour.

OpenSSL 3.0.0 SSL/TLS clients are affected by this issue. Users of this version
should upgrade to OpenSSL 3.0.1.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

This issue was reported to OpenSSL on 29th November 2021 by Tobias Nießen. The
fix was developed by Matt Caswell and Tobias Nießen.

Note


OpenSSL 1.0.2 is out of support and no longer receiving public updates. Extended
support is available for premium support customers:
https://www.openssl.org/support/contracts.html

OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind.
The impact of these issues on OpenSSL 1.1.0 has not been analysed.

Users of these versions should upgrade to OpenSSL 3.0 or 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20211214.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[Matt Caswell]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [24 August 2021]
==

SM2 Decryption Buffer Overflow (CVE-2021-3711)
==

Severity: High

In order to decrypt SM2 encrypted data an application is expected to call the
API function EVP_PKEY_decrypt(). Typically an application will call this
function twice. The first time, on entry, the "out" parameter can be NULL and,
on exit, the "outlen" parameter is populated with the buffer size required to
hold the decrypted plaintext. The application can then allocate a sufficiently
sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non-NULL
value for the "out" parameter.

A bug in the implementation of the SM2 decryption code means that the
calculation of the buffer size required to hold the plaintext returned by the
first call to EVP_PKEY_decrypt() can be smaller than the actual size required by
the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is
called by the application a second time with a buffer that is too small.

A malicious attacker who is able present SM2 content for decryption to an
application could cause attacker chosen data to overflow the buffer by up to a
maximum of 62 bytes altering the contents of other data held after the
buffer, possibly changing application behaviour or causing the application to
crash. The location of the buffer is application dependent but is typically
heap allocated.

OpenSSL versions 1.1.1k and below are affected by this issue. Users of these
versions should upgrade to OpenSSL 1.1.1l.

OpenSSL 1.0.2 is not impacted by this issue.

OpenSSL 3.0 alpha/beta releases are also affected but this issue will be
addressed before the final release.

This issue was reported to OpenSSL on 12th August 2021 by John Ouyang. The fix
was developed by Matt Caswell.

Read buffer overruns processing ASN.1 strings (CVE-2021-3712)
=

Severity: Moderate

ASN.1 strings are represented internally within OpenSSL as an ASN1_STRING
structure which contains a buffer holding the string data and a field holding
the buffer length. This contrasts with normal C strings which are repesented as
a buffer for the string data which is terminated with a NUL (0) byte.

Although not a strict requirement, ASN.1 strings that are parsed using OpenSSL's
own "d2i" functions (and other similar parsing functions) as well as any string
whose value has been set with the ASN1_STRING_set() function will additionally
NUL terminate the byte array in the ASN1_STRING structure.

However, it is possible for applications to directly construct valid ASN1_STRING
structures which do not NUL terminate the byte array by directly setting the
"data" and "length" fields in the ASN1_STRING array. This can also happen by
using the ASN1_STRING_set0() function.

Numerous OpenSSL functions that print ASN.1 data have been found to assume that
the ASN1_STRING byte array will be NUL terminated, even though this is not
guaranteed for strings that have been directly constructed. Where an application
requests an ASN.1 structure to be printed, and where that ASN.1 structure
contains ASN1_STRINGs that have been directly constructed by the application
without NUL terminating the "data" field, then a read buffer overrun can occur.

The same thing can also occur during name constraints processing of certificates
(for example if a certificate has been directly constructed by the application
instead of loading it via the OpenSSL parsing functions, and the certificate
contains non NUL terminated ASN1_STRING structures). It can also occur in the
X509_get1_email(), X509_REQ_get1_email() and X509_get1_ocsp() functions.

If a malicious actor can cause an application to directly construct an
ASN1_STRING and then process it through one of the affected OpenSSL functions
then this issue could be hit. This might result in a crash (causing a Denial of
Service attack). It could also result in the disclosure of private memory
contents (such as private keys, or sensitive plaintext).

OpenSSL versions 1.1.1k and below are affected by this issue. Users of these
versions should upgrade to OpenSSL 1.1.1l.

OpenSSL versions 1.0.2y and below are affected by this issue. However OpenSSL
1.0.2 is out of support and no longer receiving public updates. Premium support
customers of OpenSSL 1.0.2 should upgrade to 1.0.2za. Other users should upgrade
to 1.1.1l.

An initial instance of this issue in the X509_aux_print() function was reported
to OpenSSL on 18th July 2021 by Ingo Schwarze. The bugfix was developed by Ingo
Schwarze and first publicly released in OpenBSD-current on 10th July 2021 and
subsequently in OpenSSL on 20th July 2021 (commit d9d838ddc). Subsequent
analysis by David Benjamin on 17th August 2021 identified more instances of 

OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [25 March 2021]
=

CA certificate check bypass with X509_V_FLAG_X509_STRICT (CVE-2021-3450)


Severity: High

The X509_V_FLAG_X509_STRICT flag enables additional security checks of the
certificates present in a certificate chain. It is not set by default.

Starting from OpenSSL version 1.1.1h a check to disallow certificates in
the chain that have explicitly encoded elliptic curve parameters was added
as an additional strict check.

An error in the implementation of this check meant that the result of a
previous check to confirm that certificates in the chain are valid CA
certificates was overwritten. This effectively bypasses the check
that non-CA certificates must not be able to issue other certificates.

If a "purpose" has been configured then there is a subsequent opportunity
for checks that the certificate is a valid CA.  All of the named "purpose"
values implemented in libcrypto perform this check.  Therefore, where
a purpose is set the certificate chain will still be rejected even when the
strict flag has been used. A purpose is set by default in libssl client and
server certificate verification routines, but it can be overridden or
removed by an application.

In order to be affected, an application must explicitly set the
X509_V_FLAG_X509_STRICT verification flag and either not set a purpose
for the certificate verification or, in the case of TLS client or server
applications, override the default purpose.

OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these
versions should upgrade to OpenSSL 1.1.1k.

OpenSSL 1.0.2 is not impacted by this issue.

This issue was reported to OpenSSL on 18th March 2021 by Benjamin Kaduk
from Akamai and was discovered by Xiang Ding and others at Akamai. The fix was
developed by Tomáš Mráz.


NULL pointer deref in signature_algorithms processing (CVE-2021-3449)
=

Severity: High

An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation
ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits
the signature_algorithms extension (where it was present in the initial
ClientHello), but includes a signature_algorithms_cert extension then a NULL
pointer dereference will result, leading to a crash and a denial of service
attack.

A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which
is the default configuration). OpenSSL TLS clients are not impacted by this
issue.

All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions
should upgrade to OpenSSL 1.1.1k.

OpenSSL 1.0.2 is not impacted by this issue.

This issue was reported to OpenSSL on 17th March 2021 by Nokia. The fix was
developed by Peter Kästle and Samuel Sapalski from Nokia.

Note


OpenSSL 1.0.2 is out of support and no longer receiving public updates. Extended
support is available for premium support customers:
https://www.openssl.org/support/contracts.html

OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind.
The impact of these issues on OpenSSL 1.1.0 has not been analysed.

Users of these versions should upgrade to OpenSSL 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20210325.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [16 February 2021]


Null pointer deref in X509_issuer_and_serial_hash() (CVE-2021-23841)


Severity: Moderate

The OpenSSL public API function X509_issuer_and_serial_hash() attempts to
create a unique hash value based on the issuer and serial number data contained
within an X509 certificate. However it fails to correctly handle any errors
that may occur while parsing the issuer field (which might occur if the issuer
field is maliciously constructed). This may subsequently result in a NULL
pointer deref and a crash leading to a potential denial of service attack.

The function X509_issuer_and_serial_hash() is never directly called by OpenSSL
itself so applications are only vulnerable if they use this function directly
and they use it on certificates that may have been obtained from untrusted
sources.

OpenSSL versions 1.1.1i and below are affected by this issue. Users of these
versions should upgrade to OpenSSL 1.1.1j.

OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL
1.0.2 is out of support and no longer receiving public updates. Premium support
customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade
to 1.1.1j.

This issue was reported to OpenSSL on 15th December 2020 by Tavis Ormandy from
Google. The fix was developed by Matt Caswell.

Incorrect SSLv2 rollback protection (CVE-2021-23839)


Severity: Low

OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a
server that is configured to support both SSLv2 and more recent SSL and TLS
versions then a check is made for a version rollback attack when unpadding an
RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are
supposed to use a special form of padding. A server that supports greater than
SSLv2 is supposed to reject connection attempts from a client where this special
form of padding is present, because this indicates that a version rollback has
occurred (i.e. both client and server support greater than SSLv2, and yet this
is the version that is being requested).

The implementation of this padding check inverted the logic so that the
connection attempt is accepted if the padding is present, and rejected if it
is absent. This means that such as server will accept a connection if a version
rollback attack has occurred. Further the server will erroneously reject a
connection if a normal SSLv2 connection attempt is made.

Only OpenSSL 1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this
issue. In order to be vulnerable a 1.0.2 server must:

1) have configured SSLv2 support at compile time (this is off by default),
2) have configured SSLv2 support at runtime (this is off by default),
3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite
   list)

OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to
this issue. The underlying error is in the implementation of the
RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING
padding mode used by various other functions. Although 1.1.1 does not support
SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the
RSA_SSLV23_PADDING padding mode. Applications that directly call that function
or use that padding mode will encounter this issue. However since there is no
support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a
security issue in that version.

OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium
support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should
upgrade to 1.1.1j.

This issue was reported to OpenSSL on 21st January 2021 by D. Katz and Joel
Luellwitz from Trustwave. The fix was developed by Matt Caswell.

Integer overflow in CipherUpdate (CVE-2021-23840)
=

Severity: Low

Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow
the output length argument in some cases where the input length is close to the
maximum permissable length for an integer on the platform. In such cases the
return value from the function call will be 1 (indicating success), but the
output length value will be negative. This could cause applications to behave
incorrectly or crash.

OpenSSL versions 1.1.1i and below are affected by this issue. Users of these
versions should upgrade to OpenSSL 1.1.1j.

OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL
1.0.2 is out of support and no longer receiving public updates. Premium support
customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade
to 1.1.1j.

This issue was reported to OpenSSL on 13th December 2020 by Paul Kehrer. The fix
was developed by Matt Caswell.

Note

OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [08 December 2020]


EDIPARTYNAME NULL pointer de-reference (CVE-2020-1971)
==

Severity: High

The X.509 GeneralName type is a generic type for representing different types
of names. One of those name types is known as EDIPartyName. OpenSSL provides a
function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME
to see if they are equal or not. This function behaves incorrectly when both
GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash
may occur leading to a possible denial of service attack.

OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes:
1) Comparing CRL distribution point names between an available CRL and a CRL
   distribution point embedded in an X509 certificate
2) When verifying that a timestamp response token signer matches the timestamp
   authority name (exposed via the API functions TS_RESP_verify_response and
   TS_RESP_verify_token)

If an attacker can control both items being compared then that attacker could
trigger a crash. For example if the attacker can trick a client or server into
checking a malicious certificate against a malicious CRL then this may occur.
Note that some applications automatically download CRLs based on a URL embedded
in a certificate. This checking happens prior to the signatures on the
certificate and CRL being verified. OpenSSL's s_server, s_client and verify
tools have support for the "-crl_download" option which implements automatic
CRL downloading and this attack has been demonstrated to work against those
tools.

Note that an unrelated bug means that affected versions of OpenSSL cannot parse
or construct correct encodings of EDIPARTYNAME. However it is possible to
construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence
trigger this attack.

All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL
releases are out of support and have not been checked.

OpenSSL 1.1.1 users should upgrade to 1.1.1i.

OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium
support customers of OpenSSL 1.0.2 should upgrade to 1.0.2x. Other users should
upgrade to OpenSSL 1.1.1i.

This issue was reported to OpenSSL on 9th November 2020 by David Benjamin
(Google). Initial analysis was performed by David Benjamin with additional
analysis by Matt Caswell (OpenSSL). The fix was developed by Matt Caswell.

Note


OpenSSL 1.0.2 is out of support and no longer receiving public updates. Extended
support is available for premium support customers:
https://www.openssl.org/support/contracts.html

OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind.
The impact of this issue on OpenSSL 1.1.0 has not been analysed.

Users of these versions should upgrade to OpenSSL 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20201208.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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Re: OpenSSL Security Advisory

[Dmitry Belyavsky]

Many thanks!

On Wed, Sep 9, 2020 at 4:16 PM Mark J Cox  wrote:

> I just spotted it via twitter, https://raccoon-attack.com/
>
> Mark
>
> On Wed, Sep 9, 2020 at 2:08 PM Dmitry Belyavsky  wrote:
> >
> > Could you please let me know when it is available?
> >
> > On Wed, Sep 9, 2020 at 3:51 PM Mark J Cox  wrote:
> >>
> >> They should be releasing their paper very soon (today).
> >>
> >> Regards, Mark
> >>
> >> On Wed, Sep 9, 2020 at 1:45 PM Dmitry Belyavsky 
> wrote:
> >> >
> >> > Is the description of the attack publicly available?
> >> >
> >> > On Wed, Sep 9, 2020 at 3:39 PM OpenSSL  wrote:
> >> >>
> >> >> -BEGIN PGP SIGNED MESSAGE-
> >> >> Hash: SHA512
> >> >>
> >> >> OpenSSL Security Advisory [09 September 2020]
> >> >> =
> >> >>
> >> >> Raccoon Attack (CVE-2020-1968)
> >> >> ==
> >> >>
> >> >> Severity: Low
> >> >>
> >> >> The Raccoon attack exploits a flaw in the TLS specification which
> can lead to
> >> >> an attacker being able to compute the pre-master secret in
> connections which
> >> >> have used a Diffie-Hellman (DH) based ciphersuite. In such a case
> this would
> >> >> result in the attacker being able to eavesdrop on all encrypted
> communications
> >> >> sent over that TLS connection. The attack can only be exploited if an
> >> >> implementation re-uses a DH secret across multiple TLS connections.
> Note that
> >> >> this issue only impacts DH ciphersuites and not ECDH ciphersuites.
> >> >>
> >> >> OpenSSL 1.1.1 is not vulnerable to this issue: it never reuses a DH
> secret and
> >> >> does not implement any "static" DH ciphersuites.
> >> >>
> >> >> OpenSSL 1.0.2f and above will only reuse a DH secret if a "static" DH
> >> >> ciphersuite is used. These static "DH" ciphersuites are ones that
> start with the
> >> >> text "DH-" (for example "DH-RSA-AES256-SHA"). The standard IANA
> names for these
> >> >> ciphersuites all start with "TLS_DH_" but excludes those that start
> with
> >> >> "TLS_DH_anon_".
> >> >>
> >> >> OpenSSL 1.0.2e and below would reuse the DH secret across multiple
> TLS
> >> >> connections in server processes unless the SSL_OP_SINGLE_DH_USE
> option was
> >> >> explicitly configured. Therefore all ciphersuites that use DH in
> servers
> >> >> (including ephemeral DH) are vulnerable in these versions. In
> OpenSSL 1.0.2f
> >> >> SSL_OP_SINGLE_DH_USE was made the default and it could not be turned
> off as a
> >> >> response to CVE-2016-0701.
> >> >>
> >> >> Since the vulnerability lies in the TLS specification, fixing the
> affected
> >> >> ciphersuites is not viable. For this reason 1.0.2w moves the affected
> >> >> ciphersuites into the "weak-ssl-ciphers" list. Support for the
> >> >> "weak-ssl-ciphers" is not compiled in by default. This is unlikely
> to cause
> >> >> interoperability problems in most cases since use of these
> ciphersuites is rare.
> >> >> Support for the "weak-ssl-ciphers" can be added back by configuring
> OpenSSL at
> >> >> compile time with the "enable-weak-ssl-ciphers" option. This is not
> recommended.
> >> >>
> >> >> OpenSSL 1.0.2 is out of support and no longer receiving public
> updates.
> >> >>
> >> >> Premium support customers of OpenSSL 1.0.2 should upgrade to
> 1.0.2w.  If
> >> >> upgrading is not viable then users of OpenSSL 1.0.2v or below should
> ensure
> >> >> that affected ciphersuites are disabled through runtime
> configuration. Also
> >> >> note that the affected ciphersuites are only available on the server
> side if a
> >> >> DH certificate has been configured. These certificates are very
> rarely used and
> >> >> for this reason this issue has been classified as LOW severity.
> >> >>
> >> >> This issue was found by Robert Merget, Marcus Brinkmann, Nimrod
> Aviram and Juraj
> >> >> Somorovsky and report

Re: OpenSSL Security Advisory

[Mark J Cox]

I just spotted it via twitter, https://raccoon-attack.com/

Mark

On Wed, Sep 9, 2020 at 2:08 PM Dmitry Belyavsky  wrote:
>
> Could you please let me know when it is available?
>
> On Wed, Sep 9, 2020 at 3:51 PM Mark J Cox  wrote:
>>
>> They should be releasing their paper very soon (today).
>>
>> Regards, Mark
>>
>> On Wed, Sep 9, 2020 at 1:45 PM Dmitry Belyavsky  wrote:
>> >
>> > Is the description of the attack publicly available?
>> >
>> > On Wed, Sep 9, 2020 at 3:39 PM OpenSSL  wrote:
>> >>
>> >> -BEGIN PGP SIGNED MESSAGE-
>> >> Hash: SHA512
>> >>
>> >> OpenSSL Security Advisory [09 September 2020]
>> >> =
>> >>
>> >> Raccoon Attack (CVE-2020-1968)
>> >> ==
>> >>
>> >> Severity: Low
>> >>
>> >> The Raccoon attack exploits a flaw in the TLS specification which can 
>> >> lead to
>> >> an attacker being able to compute the pre-master secret in connections 
>> >> which
>> >> have used a Diffie-Hellman (DH) based ciphersuite. In such a case this 
>> >> would
>> >> result in the attacker being able to eavesdrop on all encrypted 
>> >> communications
>> >> sent over that TLS connection. The attack can only be exploited if an
>> >> implementation re-uses a DH secret across multiple TLS connections. Note 
>> >> that
>> >> this issue only impacts DH ciphersuites and not ECDH ciphersuites.
>> >>
>> >> OpenSSL 1.1.1 is not vulnerable to this issue: it never reuses a DH 
>> >> secret and
>> >> does not implement any "static" DH ciphersuites.
>> >>
>> >> OpenSSL 1.0.2f and above will only reuse a DH secret if a "static" DH
>> >> ciphersuite is used. These static "DH" ciphersuites are ones that start 
>> >> with the
>> >> text "DH-" (for example "DH-RSA-AES256-SHA"). The standard IANA names for 
>> >> these
>> >> ciphersuites all start with "TLS_DH_" but excludes those that start with
>> >> "TLS_DH_anon_".
>> >>
>> >> OpenSSL 1.0.2e and below would reuse the DH secret across multiple TLS
>> >> connections in server processes unless the SSL_OP_SINGLE_DH_USE option was
>> >> explicitly configured. Therefore all ciphersuites that use DH in servers
>> >> (including ephemeral DH) are vulnerable in these versions. In OpenSSL 
>> >> 1.0.2f
>> >> SSL_OP_SINGLE_DH_USE was made the default and it could not be turned off 
>> >> as a
>> >> response to CVE-2016-0701.
>> >>
>> >> Since the vulnerability lies in the TLS specification, fixing the affected
>> >> ciphersuites is not viable. For this reason 1.0.2w moves the affected
>> >> ciphersuites into the "weak-ssl-ciphers" list. Support for the
>> >> "weak-ssl-ciphers" is not compiled in by default. This is unlikely to 
>> >> cause
>> >> interoperability problems in most cases since use of these ciphersuites 
>> >> is rare.
>> >> Support for the "weak-ssl-ciphers" can be added back by configuring 
>> >> OpenSSL at
>> >> compile time with the "enable-weak-ssl-ciphers" option. This is not 
>> >> recommended.
>> >>
>> >> OpenSSL 1.0.2 is out of support and no longer receiving public updates.
>> >>
>> >> Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2w.  If
>> >> upgrading is not viable then users of OpenSSL 1.0.2v or below should 
>> >> ensure
>> >> that affected ciphersuites are disabled through runtime configuration. 
>> >> Also
>> >> note that the affected ciphersuites are only available on the server side 
>> >> if a
>> >> DH certificate has been configured. These certificates are very rarely 
>> >> used and
>> >> for this reason this issue has been classified as LOW severity.
>> >>
>> >> This issue was found by Robert Merget, Marcus Brinkmann, Nimrod Aviram 
>> >> and Juraj
>> >> Somorovsky and reported to OpenSSL on 28th May 2020 under embargo in 
>> >> order to
>> >> allow co-ordinated disclosure with other implementations.
>> >>
>> >> Note
>> >> 

Re: OpenSSL Security Advisory

[Dmitry Belyavsky]

Could you please let me know when it is available?

On Wed, Sep 9, 2020 at 3:51 PM Mark J Cox  wrote:

> They should be releasing their paper very soon (today).
>
> Regards, Mark
>
> On Wed, Sep 9, 2020 at 1:45 PM Dmitry Belyavsky  wrote:
> >
> > Is the description of the attack publicly available?
> >
> > On Wed, Sep 9, 2020 at 3:39 PM OpenSSL  wrote:
> >>
> >> -BEGIN PGP SIGNED MESSAGE-----
> >> Hash: SHA512
> >>
> >> OpenSSL Security Advisory [09 September 2020]
> >> =
> >>
> >> Raccoon Attack (CVE-2020-1968)
> >> ==
> >>
> >> Severity: Low
> >>
> >> The Raccoon attack exploits a flaw in the TLS specification which can
> lead to
> >> an attacker being able to compute the pre-master secret in connections
> which
> >> have used a Diffie-Hellman (DH) based ciphersuite. In such a case this
> would
> >> result in the attacker being able to eavesdrop on all encrypted
> communications
> >> sent over that TLS connection. The attack can only be exploited if an
> >> implementation re-uses a DH secret across multiple TLS connections.
> Note that
> >> this issue only impacts DH ciphersuites and not ECDH ciphersuites.
> >>
> >> OpenSSL 1.1.1 is not vulnerable to this issue: it never reuses a DH
> secret and
> >> does not implement any "static" DH ciphersuites.
> >>
> >> OpenSSL 1.0.2f and above will only reuse a DH secret if a "static" DH
> >> ciphersuite is used. These static "DH" ciphersuites are ones that start
> with the
> >> text "DH-" (for example "DH-RSA-AES256-SHA"). The standard IANA names
> for these
> >> ciphersuites all start with "TLS_DH_" but excludes those that start with
> >> "TLS_DH_anon_".
> >>
> >> OpenSSL 1.0.2e and below would reuse the DH secret across multiple TLS
> >> connections in server processes unless the SSL_OP_SINGLE_DH_USE option
> was
> >> explicitly configured. Therefore all ciphersuites that use DH in servers
> >> (including ephemeral DH) are vulnerable in these versions. In OpenSSL
> 1.0.2f
> >> SSL_OP_SINGLE_DH_USE was made the default and it could not be turned
> off as a
> >> response to CVE-2016-0701.
> >>
> >> Since the vulnerability lies in the TLS specification, fixing the
> affected
> >> ciphersuites is not viable. For this reason 1.0.2w moves the affected
> >> ciphersuites into the "weak-ssl-ciphers" list. Support for the
> >> "weak-ssl-ciphers" is not compiled in by default. This is unlikely to
> cause
> >> interoperability problems in most cases since use of these ciphersuites
> is rare.
> >> Support for the "weak-ssl-ciphers" can be added back by configuring
> OpenSSL at
> >> compile time with the "enable-weak-ssl-ciphers" option. This is not
> recommended.
> >>
> >> OpenSSL 1.0.2 is out of support and no longer receiving public updates.
> >>
> >> Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2w.  If
> >> upgrading is not viable then users of OpenSSL 1.0.2v or below should
> ensure
> >> that affected ciphersuites are disabled through runtime configuration.
> Also
> >> note that the affected ciphersuites are only available on the server
> side if a
> >> DH certificate has been configured. These certificates are very rarely
> used and
> >> for this reason this issue has been classified as LOW severity.
> >>
> >> This issue was found by Robert Merget, Marcus Brinkmann, Nimrod Aviram
> and Juraj
> >> Somorovsky and reported to OpenSSL on 28th May 2020 under embargo in
> order to
> >> allow co-ordinated disclosure with other implementations.
> >>
> >> Note
> >> 
> >>
> >> OpenSSL 1.0.2 is out of support and no longer receiving public updates.
> Extended
> >> support is available for premium support customers:
> >> https://www.openssl.org/support/contracts.html
> >>
> >> OpenSSL 1.1.0 is out of support and no longer receiving updates of any
> kind.
> >> The impact of this issue on OpenSSL 1.1.0 has not been analysed.
> >>
> >> Users of these versions should upgrade to OpenSSL 1.1.1.
> >>
> >> References
> >> ==
> >>
> >> URL for this Security Advisory:
> &

Re: OpenSSL Security Advisory

[Mark J Cox]

They should be releasing their paper very soon (today).

Regards, Mark

On Wed, Sep 9, 2020 at 1:45 PM Dmitry Belyavsky  wrote:
>
> Is the description of the attack publicly available?
>
> On Wed, Sep 9, 2020 at 3:39 PM OpenSSL  wrote:
>>
>> -BEGIN PGP SIGNED MESSAGE-
>> Hash: SHA512
>>
>> OpenSSL Security Advisory [09 September 2020]
>> =
>>
>> Raccoon Attack (CVE-2020-1968)
>> ==
>>
>> Severity: Low
>>
>> The Raccoon attack exploits a flaw in the TLS specification which can lead to
>> an attacker being able to compute the pre-master secret in connections which
>> have used a Diffie-Hellman (DH) based ciphersuite. In such a case this would
>> result in the attacker being able to eavesdrop on all encrypted 
>> communications
>> sent over that TLS connection. The attack can only be exploited if an
>> implementation re-uses a DH secret across multiple TLS connections. Note that
>> this issue only impacts DH ciphersuites and not ECDH ciphersuites.
>>
>> OpenSSL 1.1.1 is not vulnerable to this issue: it never reuses a DH secret 
>> and
>> does not implement any "static" DH ciphersuites.
>>
>> OpenSSL 1.0.2f and above will only reuse a DH secret if a "static" DH
>> ciphersuite is used. These static "DH" ciphersuites are ones that start with 
>> the
>> text "DH-" (for example "DH-RSA-AES256-SHA"). The standard IANA names for 
>> these
>> ciphersuites all start with "TLS_DH_" but excludes those that start with
>> "TLS_DH_anon_".
>>
>> OpenSSL 1.0.2e and below would reuse the DH secret across multiple TLS
>> connections in server processes unless the SSL_OP_SINGLE_DH_USE option was
>> explicitly configured. Therefore all ciphersuites that use DH in servers
>> (including ephemeral DH) are vulnerable in these versions. In OpenSSL 1.0.2f
>> SSL_OP_SINGLE_DH_USE was made the default and it could not be turned off as a
>> response to CVE-2016-0701.
>>
>> Since the vulnerability lies in the TLS specification, fixing the affected
>> ciphersuites is not viable. For this reason 1.0.2w moves the affected
>> ciphersuites into the "weak-ssl-ciphers" list. Support for the
>> "weak-ssl-ciphers" is not compiled in by default. This is unlikely to cause
>> interoperability problems in most cases since use of these ciphersuites is 
>> rare.
>> Support for the "weak-ssl-ciphers" can be added back by configuring OpenSSL 
>> at
>> compile time with the "enable-weak-ssl-ciphers" option. This is not 
>> recommended.
>>
>> OpenSSL 1.0.2 is out of support and no longer receiving public updates.
>>
>> Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2w.  If
>> upgrading is not viable then users of OpenSSL 1.0.2v or below should ensure
>> that affected ciphersuites are disabled through runtime configuration. Also
>> note that the affected ciphersuites are only available on the server side if 
>> a
>> DH certificate has been configured. These certificates are very rarely used 
>> and
>> for this reason this issue has been classified as LOW severity.
>>
>> This issue was found by Robert Merget, Marcus Brinkmann, Nimrod Aviram and 
>> Juraj
>> Somorovsky and reported to OpenSSL on 28th May 2020 under embargo in order to
>> allow co-ordinated disclosure with other implementations.
>>
>> Note
>> 
>>
>> OpenSSL 1.0.2 is out of support and no longer receiving public updates. 
>> Extended
>> support is available for premium support customers:
>> https://www.openssl.org/support/contracts.html
>>
>> OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind.
>> The impact of this issue on OpenSSL 1.1.0 has not been analysed.
>>
>> Users of these versions should upgrade to OpenSSL 1.1.1.
>>
>> References
>> ==
>>
>> URL for this Security Advisory:
>> https://www.openssl.org/news/secadv/20200909.txt
>>
>> Note: the online version of the advisory may be updated with additional 
>> details
>> over time.
>>
>> For details of OpenSSL severity classifications please see:
>> https://www.openssl.org/policies/secpolicy.html
>> -BEGIN PGP SIGNATURE-
>>
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>> =U7OO
>> -END PGP SIGNATURE-
>
>
>
> --
> SY, Dmitry Belyavsky

Re: OpenSSL Security Advisory

[Dmitry Belyavsky]

Is the description of the attack publicly available?

On Wed, Sep 9, 2020 at 3:39 PM OpenSSL  wrote:

> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA512
>
> OpenSSL Security Advisory [09 September 2020]
> =
>
> Raccoon Attack (CVE-2020-1968)
> ==
>
> Severity: Low
>
> The Raccoon attack exploits a flaw in the TLS specification which can lead
> to
> an attacker being able to compute the pre-master secret in connections
> which
> have used a Diffie-Hellman (DH) based ciphersuite. In such a case this
> would
> result in the attacker being able to eavesdrop on all encrypted
> communications
> sent over that TLS connection. The attack can only be exploited if an
> implementation re-uses a DH secret across multiple TLS connections. Note
> that
> this issue only impacts DH ciphersuites and not ECDH ciphersuites.
>
> OpenSSL 1.1.1 is not vulnerable to this issue: it never reuses a DH secret
> and
> does not implement any "static" DH ciphersuites.
>
> OpenSSL 1.0.2f and above will only reuse a DH secret if a "static" DH
> ciphersuite is used. These static "DH" ciphersuites are ones that start
> with the
> text "DH-" (for example "DH-RSA-AES256-SHA"). The standard IANA names for
> these
> ciphersuites all start with "TLS_DH_" but excludes those that start with
> "TLS_DH_anon_".
>
> OpenSSL 1.0.2e and below would reuse the DH secret across multiple TLS
> connections in server processes unless the SSL_OP_SINGLE_DH_USE option was
> explicitly configured. Therefore all ciphersuites that use DH in servers
> (including ephemeral DH) are vulnerable in these versions. In OpenSSL
> 1.0.2f
> SSL_OP_SINGLE_DH_USE was made the default and it could not be turned off
> as a
> response to CVE-2016-0701.
>
> Since the vulnerability lies in the TLS specification, fixing the affected
> ciphersuites is not viable. For this reason 1.0.2w moves the affected
> ciphersuites into the "weak-ssl-ciphers" list. Support for the
> "weak-ssl-ciphers" is not compiled in by default. This is unlikely to cause
> interoperability problems in most cases since use of these ciphersuites is
> rare.
> Support for the "weak-ssl-ciphers" can be added back by configuring
> OpenSSL at
> compile time with the "enable-weak-ssl-ciphers" option. This is not
> recommended.
>
> OpenSSL 1.0.2 is out of support and no longer receiving public updates.
>
> Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2w.  If
> upgrading is not viable then users of OpenSSL 1.0.2v or below should ensure
> that affected ciphersuites are disabled through runtime configuration. Also
> note that the affected ciphersuites are only available on the server side
> if a
> DH certificate has been configured. These certificates are very rarely
> used and
> for this reason this issue has been classified as LOW severity.
>
> This issue was found by Robert Merget, Marcus Brinkmann, Nimrod Aviram and
> Juraj
> Somorovsky and reported to OpenSSL on 28th May 2020 under embargo in order
> to
> allow co-ordinated disclosure with other implementations.
>
> Note
> 
>
> OpenSSL 1.0.2 is out of support and no longer receiving public updates.
> Extended
> support is available for premium support customers:
> https://www.openssl.org/support/contracts.html
>
> OpenSSL 1.1.0 is out of support and no longer receiving updates of any
> kind.
> The impact of this issue on OpenSSL 1.1.0 has not been analysed.
>
> Users of these versions should upgrade to OpenSSL 1.1.1.
>
> References
> ==
>
> URL for this Security Advisory:
> https://www.openssl.org/news/secadv/20200909.txt
>
> Note: the online version of the advisory may be updated with additional
> details
> over time.
>
> For details of OpenSSL severity classifications please see:
> https://www.openssl.org/policies/secpolicy.html
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> =U7OO
> -END PGP SIGNATURE-
>


-- 
SY, Dmitry Belyavsky

OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

OpenSSL Security Advisory [09 September 2020]
=

Raccoon Attack (CVE-2020-1968)
==

Severity: Low

The Raccoon attack exploits a flaw in the TLS specification which can lead to
an attacker being able to compute the pre-master secret in connections which
have used a Diffie-Hellman (DH) based ciphersuite. In such a case this would
result in the attacker being able to eavesdrop on all encrypted communications
sent over that TLS connection. The attack can only be exploited if an
implementation re-uses a DH secret across multiple TLS connections. Note that
this issue only impacts DH ciphersuites and not ECDH ciphersuites.

OpenSSL 1.1.1 is not vulnerable to this issue: it never reuses a DH secret and
does not implement any "static" DH ciphersuites.

OpenSSL 1.0.2f and above will only reuse a DH secret if a "static" DH
ciphersuite is used. These static "DH" ciphersuites are ones that start with the
text "DH-" (for example "DH-RSA-AES256-SHA"). The standard IANA names for these
ciphersuites all start with "TLS_DH_" but excludes those that start with
"TLS_DH_anon_".

OpenSSL 1.0.2e and below would reuse the DH secret across multiple TLS
connections in server processes unless the SSL_OP_SINGLE_DH_USE option was
explicitly configured. Therefore all ciphersuites that use DH in servers
(including ephemeral DH) are vulnerable in these versions. In OpenSSL 1.0.2f
SSL_OP_SINGLE_DH_USE was made the default and it could not be turned off as a
response to CVE-2016-0701.

Since the vulnerability lies in the TLS specification, fixing the affected
ciphersuites is not viable. For this reason 1.0.2w moves the affected
ciphersuites into the "weak-ssl-ciphers" list. Support for the
"weak-ssl-ciphers" is not compiled in by default. This is unlikely to cause
interoperability problems in most cases since use of these ciphersuites is rare.
Support for the "weak-ssl-ciphers" can be added back by configuring OpenSSL at
compile time with the "enable-weak-ssl-ciphers" option. This is not recommended.

OpenSSL 1.0.2 is out of support and no longer receiving public updates.

Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2w.  If
upgrading is not viable then users of OpenSSL 1.0.2v or below should ensure
that affected ciphersuites are disabled through runtime configuration. Also
note that the affected ciphersuites are only available on the server side if a
DH certificate has been configured. These certificates are very rarely used and
for this reason this issue has been classified as LOW severity.

This issue was found by Robert Merget, Marcus Brinkmann, Nimrod Aviram and Juraj
Somorovsky and reported to OpenSSL on 28th May 2020 under embargo in order to
allow co-ordinated disclosure with other implementations.

Note


OpenSSL 1.0.2 is out of support and no longer receiving public updates. Extended
support is available for premium support customers:
https://www.openssl.org/support/contracts.html

OpenSSL 1.1.0 is out of support and no longer receiving updates of any kind.
The impact of this issue on OpenSSL 1.1.0 has not been analysed.

Users of these versions should upgrade to OpenSSL 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20200909.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [21 April 2020]
=

Segmentation fault in SSL_check_chain (CVE-2020-1967)
=

Severity: High

Server or client applications that call the SSL_check_chain() function during or
after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a
result of incorrect handling of the "signature_algorithms_cert" TLS extension.
The crash occurs if an invalid or unrecognised signature algorithm is received
from the peer. This could be exploited by a malicious peer in a Denial of
Service attack.

OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue.  This
issue did not affect OpenSSL versions prior to 1.1.1d.

Affected OpenSSL 1.1.1 users should upgrade to 1.1.1g

This issue was found by Bernd Edlinger and reported to OpenSSL on 7th April
2020. It was found using the new static analysis pass being implemented in GCC,
- -fanalyzer. Additional analysis was performed by Matt Caswell and Benjamin
Kaduk.

Note
=

This issue did not affect OpenSSL 1.0.2 however these versions are out of
support and no longer receiving public updates. Extended support is available
for premium support customers: https://www.openssl.org/support/contracts.html

This issue did not affect OpenSSL 1.1.0 however these versions are out of
support and no longer receiving updates.

Users of these versions should upgrade to OpenSSL 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20200421.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

OpenSSL Security Advisory [6 December 2019]
===

rsaz_512_sqr overflow bug on x86_64 (CVE-2019-1551)
===

Severity: Low

There is an overflow bug in the x64_64 Montgomery squaring procedure used in
exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis
suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a
result of this defect would be very difficult to perform and are not believed
likely. Attacks against DH512 are considered just feasible. However, for an
attack the target would have to re-use the DH512 private key, which is not
recommended anyway. Also applications directly using the low level API
BN_mod_exp may be affected if they use BN_FLG_CONSTTIME.

OpenSSL versions 1.1.1 and 1.0.2 are affected by this issue. However due to the
low severity of this issue we are not creating new releases at this time. The
1.1.1 mitigation for this issue can be found in commit 419102400. The 1.0.2
mitigation for this issue can be found in commit f1c5eea8a.

This issue was found by OSS-Fuzz and Guido Vranken and reported to OpenSSL on
12th September 2019. The fix was developed by Andy Polyakov with additional
analysis by Bernd Edlinger.

Note
=

OpenSSL 1.0.2 is currently only receiving security updates. Support for 1.0.2
will end on 31st December 2019. Extended support is available for premium
support customers: https://www.openssl.org/support/contracts.html

OpenSSL 1.1.0 is out of support and no longer receiving updates. It is unknown
whether issues in this advisory affect it.

Users of these versions should upgrade to OpenSSL 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20191206.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

OpenSSL Security Advisory [10 September 2019]
=

ECDSA remote timing attack (CVE-2019-1547)
==

Severity: Low

Normally in OpenSSL EC groups always have a co-factor present and this is used
in side channel resistant code paths. However, in some cases, it is possible to
construct a group using explicit parameters (instead of using a named curve). In
those cases it is possible that such a group does not have the cofactor present.
This can occur even where all the parameters match a known named curve.

If such a curve is used then OpenSSL falls back to non-side channel resistant
code paths which may result in full key recovery during an ECDSA signature
operation.

In order to be vulnerable an attacker would have to have the ability to time
the creation of a large number of signatures where explicit parameters with no
co-factor present are in use by an application using libcrypto.

For the avoidance of doubt libssl is not vulnerable because explicit parameters
are never used.

OpenSSL versions 1.1.1, 1.1.0 and 1.0.2 are affected by this issue.

OpenSSL 1.1.1 users should upgrade to 1.1.1d
OpenSSL 1.1.0 users should upgrade to 1.1.0l
OpenSSL 1.0.2 users should upgrade to 1.0.2t

This issue was reported by Cesar Pereida García, Sohaib ul Hassan,
Nicola Tuveri, Iaroslav Gridin, Alejandro Cabrera Aldaya, and Billy Brumley. The
fix was developed by Billy Brumley. It was reported to OpenSSL on 5th August
2019.


Fork Protection (CVE-2019-1549)
===

Severity: Low

OpenSSL 1.1.1 introduced a rewritten random number generator (RNG). This was
intended to include protection in the event of a fork() system call in order to
ensure that the parent and child processes did not share the same RNG state.
However this protection was not being used in the default case.

A partial mitigation for this issue is that the output from a high precision
timer is mixed into the RNG state so the likelihood of a parent and child
process sharing state is significantly reduced.

If an application already calls OPENSSL_init_crypto() explicitly using
OPENSSL_INIT_ATFORK then this problem does not occur at all.

OpenSSL version 1.1.1 is affected by this issue.

OpenSSL 1.1.1 users should upgrade to 1.1.1d

This issue was reported by Matt Caswell. The fix was developed by Matthias
St. Pierre. It was reported to OpenSSL on 27th May 2019.


Padding Oracle in PKCS7_dataDecode and CMS_decrypt_set1_pkey (CVE-2019-1563)


Severity: Low

In situations where an attacker receives automated notification of the success
or failure of a decryption attempt an attacker, after sending a very large
number of messages to be decrypted, can recover a CMS/PKCS7 transported
encryption key or decrypt any RSA encrypted message that was encrypted with the
public RSA key, using a Bleichenbacher padding oracle attack. Applications are
not affected if they use a certificate together with the private RSA key to the
CMS_decrypt or PKCS7_decrypt functions to select the correct recipient info to
decrypt.

OpenSSL 1.1.1 users should upgrade to 1.1.1d
OpenSSL 1.1.0 users should upgrade to 1.1.0l
OpenSSL 1.0.2 users should upgrade to 1.0.2t

This issue was reported by and the fix developed by Bernd Edlinger. It was
reported to OpenSSL on 21st August 2019.


Note
=

OpenSSL 1.0.2 is currently only receiving security updates. Support for 1.0.2
will end on 31st December 2019.

Support for 1.1.0 ends on 11th September 2019 so 1.1.0l is expected to be the
last 1.1.0 release.

Users of these versions should upgrade to OpenSSL 1.1.1.


References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20190910.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

OpenSSL Security Advisory [30 July 2019]


Windows builds with insecure path defaults (CVE-2019-1552)
==

Severity: Low

OpenSSL has internal defaults for a directory tree where it can find a
configuration file as well as certificates used for verification in
TLS.  This directory is most commonly referred to as OPENSSLDIR, and
is configurable with the --prefix / --openssldir configuration options.

For OpenSSL versions 1.1.0 and 1.1.1, the mingw configuration targets
assume that resulting programs and libraries are installed in a
Unix-like environment and the default prefix for program installation
as well as for OPENSSLDIR should be '/usr/local'.

However, mingw programs are Windows programs, and as such, find
themselves looking at sub-directories of 'C:/usr/local', which may be
world writable, which enables untrusted users to modify OpenSSL's
default configuration, insert CA certificates, modify (or even
replace) existing engine modules, etc.

For OpenSSL 1.0.2, '/usr/local/ssl' is used as default for OPENSSLDIR
on all Unix and Windows targets, including Visual C builds.  However,
some build instructions for the diverse Windows targets on 1.0.2
encourage you to specify your own --prefix.

OpenSSL versions 1.1.1, 1.1.0 and 1.0.2 are affected by this issue.
Due to the limited scope of affected deployments this has been
assessed as low severity and therefore we are not creating new
releases at this time.

The mitigations are found in these commits:
- - For 1.1.1, commit 54aa9d51b09d67e90db443f682cface795f5af9e
- - For 1.1.0, commit e32bc855a81a2d48d215c506bdeb4f598045f7e9 and
  b15a19c148384e73338aa7c5b12652138e35ed28
- - For 1.0.2, commit d333ebaf9c77332754a9d5e111e2f53e1de54fdd

The 1.1.1 and 1.1.0 mitigation set more appropriate defaults for
mingw, while the 1.0.2 mitigation documents the issue and provides
enhanced examples.

This issue was reported by Rich Mirth.  The fix was developed by
Richard Levitte from the OpenSSL development team.  It was reported to
OpenSSL on 9th Jun 2019.

Note
=

OpenSSL 1.0.2 and 1.1.0 are currently only receiving security updates.
Support for 1.0.2 will end on 31st December 2019. Support for 1.1.0
will end on 11th September 2019. Users of these versions should
upgrade to OpenSSL 1.1.1.


Referenses
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20190730.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

OpenSSL Security Advisory [6 March 2019]


ChaCha20-Poly1305 with long nonces (CVE-2019-1543)
==

Severity: Low

ChaCha20-Poly1305 is an AEAD cipher, and requires a unique nonce input for every
encryption operation. RFC 7539 specifies that the nonce value (IV) should be 96
bits (12 bytes). OpenSSL allows a variable nonce length and front pads the nonce
with 0 bytes if it is less than 12 bytes. However it also incorrectly allows a
nonce to be set of up to 16 bytes. In this case only the last 12 bytes are
significant and any additional leading bytes are ignored.

It is a requirement of using this cipher that nonce values are unique. Messages
encrypted using a reused nonce value are susceptible to serious confidentiality
and integrity attacks. If an application changes the default nonce length to be
longer than 12 bytes and then makes a change to the leading bytes of the nonce
expecting the new value to be a new unique nonce then such an application could
inadvertently encrypt messages with a reused nonce.

Additionally the ignored bytes in a long nonce are not covered by the integrity
guarantee of this cipher. Any application that relies on the integrity of these
ignored leading bytes of a long nonce may be further affected.

Any OpenSSL internal use of this cipher, including in SSL/TLS, is safe because
no such use sets such a long nonce value. However user applications that use
this cipher directly and set a non-default nonce length to be longer than 12
bytes may be vulnerable.

OpenSSL versions 1.1.1 and 1.1.0 are affected by this issue. Due to the limited
scope of affected deployments this has been assessed as low severity and
therefore we are not creating new releases at this time. The 1.1.1 mitigation
for this issue can be found in commit f426625b6a. The 1.1.0 mitigation for this
issue can be found in commit ee22257b14.

This issue does not impact OpenSSL 1.0.2.

This issue was discovered by Joran Dirk Greef of Ronomon. The fix was developed
by Matt Caswell from the OpenSSL development team. It was reported to OpenSSL on
26th February 2019.

Note


OpenSSL 1.0.2 and 1.1.0 are currently only receiving security updates. Support
for 1.0.2 will end on 31st December 2019. Support for 1.1.0 will end on 11th
September 2019. Users of these versions should upgrade to OpenSSL 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20190306.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

OpenSSL Security Advisory [26 February 2019]


0-byte record padding oracle (CVE-2019-1559)


Severity: Moderate

If an application encounters a fatal protocol error and then calls
SSL_shutdown() twice (once to send a close_notify, and once to receive one) then
OpenSSL can respond differently to the calling application if a 0 byte record is
received with invalid padding compared to if a 0 byte record is received with an
invalid MAC. If the application then behaves differently based on that in a way
that is detectable to the remote peer, then this amounts to a padding oracle
that could be used to decrypt data.

In order for this to be exploitable "non-stitched" ciphersuites must be in use.
Stitched ciphersuites are optimised implementations of certain commonly used
ciphersuites. Also the application must call SSL_shutdown() twice even if a
protocol error has occurred (applications should not do this but some do
anyway).

This issue does not impact OpenSSL 1.1.1 or 1.1.0.

OpenSSL 1.0.2 users should upgrade to 1.0.2r.

This issue was discovered by Juraj Somorovsky, Robert Merget and Nimrod Aviram,
with additional investigation by Steven Collison and Andrew Hourselt. It was
reported to OpenSSL on 10th December 2018.

Note


OpenSSL 1.0.2 and 1.1.0 are currently only receiving security updates. Support
for 1.0.2 will end on 31st December 2019. Support for 1.1.0 will end on 11th
September 2019. Users of these versions should upgrade to OpenSSL 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20190226.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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[openssl-project] OpenSSL Security Advisory

[Matt Caswell]

OpenSSL Security Advisory [12 November 2018]


Microarchitecture timing vulnerability in ECC scalar multiplication 
(CVE-2018-5407)
===

Severity: Low

OpenSSL ECC scalar multiplication, used in e.g. ECDSA and ECDH, has been shown
to be vulnerable to a microarchitecture timing side channel attack. An attacker
with sufficient access to mount local timing attacks during ECDSA signature
generation could recover the private key.

This issue does not impact OpenSSL 1.1.1 and is already fixed in the latest
version of OpenSSL 1.1.0 (1.1.0i). OpenSSL 1.0.2 is affected but due to the low
severity of this issue we are not creating a new release at this time. The 1.0.2
mitigation for this issue can be found in commit b18162a7c.

OpenSSL 1.1.0 users should upgrade to 1.1.0i.

This issue was reported to OpenSSL on 26th October 2018 by Alejandro Cabrera
Aldaya, Billy Brumley, Sohaib ul Hassan, Cesar Pereida Garcia and Nicola Tuveri.

Note


OpenSSL 1.1.0 is currently only receiving security updates. Support for this
version will end on 11th September 2019. Users of this version should upgrade to
OpenSSL 1.1.1.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20181112.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html



signature.asc
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[openssl-project] OpenSSL Security Advisory

[OpenSSL]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256


OpenSSL Security Advisory [16 Apr 2018]


Cache timing vulnerability in RSA Key Generation (CVE-2018-0737)


Severity: Low

The OpenSSL RSA Key generation algorithm has been shown to be vulnerable to a
cache timing side channel attack. An attacker with sufficient access to mount
cache timing attacks during the RSA key generation process could recover the
private key.

Due to the low severity of this issue we are not issuing a new release of
OpenSSL 1.1.0 or 1.0.2 at this time. The fix will be included in OpenSSL 1.1.0i
and OpenSSL 1.0.2p when they become available. The fix is also available in
commit 6939eab03 (for 1.1.0) and commit 349a41da1 (for 1.0.2) in the OpenSSL git
repository.

This issue was reported to OpenSSL on 4th April 2018 by Alejandro Cabrera
Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis Manuel Alvarez Tapia.
The fix was developed by Billy Brumley.

References
==

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20180416.txt

Note: the online version of the advisory may be updated with additional details
over time.

For details of OpenSSL severity classifications please see:
https://www.openssl.org/policies/secpolicy.html
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