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______________________________________________________________________________
SGI Security Advisory
Title: X Windows zlib/MIT-SHM/huge font DoS vulnerabilities
Number: 20021001-01-P
Date: October 15, 2002
References: CVE CAN-2002-164
References: CVE CVE-2002-0059
References: CERT CA-2002-07
______________________________________________________________________________
- -----------------------
- --- Issue Specifics ---
- -----------------------
This bulletin covers several graphics-related security issues:
o It's been reported that the zlib libraries that ship with x_eoe
have a "double free" vulnerability.
See: http://www.kb.cert.org/vuls/id/368819
o It's been reported that the IRIX X server has security vulnerabilities.
1) Under certain conditions, Mozilla can cause the X server to crash.
See: http://web.lemuria.org/security/mozilla-dos.html for details.
2) There is a vulnerability in the MIT-SHM code that can allow a local
user to read or write to any SHM segment.
See: http://www.linuxsecurity.com/advisories/caldera_advisory-2006.html
SGI has investigated the issue and recommends the following steps for
neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be
implemented on ALL vulnerable SGI systems.
These issues have been corrected in future releases of IRIX and with patches.
- --------------
- --- Impact ---
- --------------
The X server (/usr/bin/X11/Xsgi) is installed by default on IRIX 6.5 systems
as part of x_eoe.sw.Server.
To determine the version of IRIX you are running, execute the following
command:
# uname -R
That will return a result similar to the following:
# 6.5 6.5.16f
The first number ("6.5") is the release name, the second ("6.5.15f" in this
case) is the extended release name. The extended release name is the
"version" we refer to throughout this document.
Exploitation of these vulnerabilities can result in a root compromise or a
Denial of Service attack. A local account is required to exploit these
vulnerabilities.
- ----------------------------
- --- Temporary Workaround ---
- ----------------------------
There is no good workaround available for these problems if running in
graphical mode is desired. SGI recommends either upgrading to IRIX 6.5.18
when it is released, or installing the appropriate patch from the listing
below.
If running in graphical mode is not needed, you can execute the command
"/usr/gfx/stopgfx" and it will turn the windowsystem configuration flag off,
kill the X server, and keep it from being restarted on next boot.
- ----------------
- --- Solution ---
- ----------------
SGI has provided a series of patches for these vulnerabilities. Our
recommendation is to upgrade to IRIX 6.5.18 when available, or install the
appropriate patch.
OS Version Vulnerable? Patch # Other Actions
---------- ----------- ------- -------------
IRIX 3.x unknown Note 1
IRIX 4.x unknown Note 1
IRIX 5.x unknown Note 1
IRIX 6.0.x unknown Note 1
IRIX 6.1 unknown Note 1
IRIX 6.2 unknown Note 1
IRIX 6.3 unknown Note 1
IRIX 6.4 unknown Note 1
IRIX 6.5 yes Notes 2 & 3
IRIX 6.5.1 yes Notes 2 & 3
IRIX 6.5.2 yes Notes 2 & 3
IRIX 6.5.3 yes Notes 2 & 3
IRIX 6.5.4 yes Notes 2 & 3
IRIX 6.5.5 yes Notes 2 & 3
IRIX 6.5.6 yes Notes 2 & 3
IRIX 6.5.7 yes Notes 2 & 3
IRIX 6.5.8 yes Notes 2 & 3
IRIX 6.5.9 yes Notes 2 & 3
IRIX 6.5.10 yes Notes 2 & 3
IRIX 6.5.11 yes Notes 2 & 3
IRIX 6.5.12 yes Notes 2 & 3
IRIX 6.5.13m yes 4709
IRIX 6.5.13f yes 4710
IRIX 6.5.14m yes 4648
IRIX 6.5.14f yes 4649
IRIX 6.5.15m yes 4648
IRIX 6.5.15f yes 4649
IRIX 6.5.16m yes 4663
IRIX 6.5.16f yes 4664
IRIX 6.5.17m yes 4757
IRIX 6.5.17f yes 4758
NOTES
1) This version of the IRIX operating has been retired. Upgrade to an
actively supported IRIX operating system. See
http://support.sgi.com/irix/news/index.html#policy for more
information.
2) If you have not received an IRIX 6.5.X CD for IRIX 6.5, contact your
SGI Support Provider or URL: http://support.sgi.com/irix/swupdates/
3) Upgrade to IRIX 6.5.18.
##### Patch File Checksums ####
The actual patch will be a tar file containing the following files:
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- ------------------
- --- References ---
- ------------------
SGI Security Advisories can be found at:
http://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/advisories/
SGI Security Patches can be found at:
http://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/patches/
SGI patches for IRIX can be found at the following patch servers:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/
SGI freeware updates for IRIX can be found at:
http://freeware.sgi.com/
SGI fixes for SGI open sourced code can be found on:
http://oss.sgi.com/projects/
SGI patches and RPMs for Linux can be found at:
http://support.sgi.com/linux/ or
http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/
SGI patches for Windows NT or 2000 can be found at:
http://support.sgi.com/nt/
IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/
IRIX 6.5 Maintenance Release Streams can be found at:
http://support.sgi.com/colls/patches/tools/relstream/index.html
IRIX 6.5 Software Update CDs can be obtained from:
http://support.sgi.com/irix/swupdates/
The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). Security advisories and patches are
located under the URL ftp://patches.sgi.com/support/free/security/
For security and patch management reasons, ftp.sgi.com (mirrors
patches.sgi.com security FTP repository) lags behind and does not do a
real-time update.
- ------------------------
- --- Acknowledgments ----
- ------------------------
SGI wishes to thank FIRST and the users of the Internet Community at large
for their assistance in this matter.
- -----------------------------------------
- --- SGI Security Information/Contacts ---
- -----------------------------------------
If there are questions about this document, email can be sent to
[EMAIL PROTECTED]
------oOo------
SGI provides security information and patches for use by the entire SGI
community. This information is freely available to any person needing the
information and is available via anonymous FTP and the Web.
The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). Security advisories and patches are
located under the URL ftp://patches.sgi.com/support/free/security/
The SGI Security Headquarters Web page is accessible at the URL:
http://www.sgi.com/support/security/
For issues with the patches on the FTP sites, email can be sent to
[EMAIL PROTECTED]
For assistance obtaining or working with security patches, please
contact your SGI support provider.
------oOo------
SGI provides a free security mailing list service called wiretap and
encourages interested parties to self-subscribe to receive (via email) all
SGI Security Advisories when they are released. Subscribing to the mailing
list can be done via the Web
(http://www.sgi.com/support/security/wiretap.html) or by sending email to
SGI as outlined below.
% mail [EMAIL PROTECTED]
subscribe wiretap <YourEmailAddress>
end
^d
In the example above, <YourEmailAddress> is the email address that you wish
the mailing list information sent to. The word end must be on a separate
line to indicate the end of the body of the message. The control-d (^d) is
used to indicate to the mail program that you are finished composing the
mail message.
------oOo------
SGI provides a comprehensive customer World Wide Web site. This site is
located at http://www.sgi.com/support/security/ .
------oOo------
If there are general security questions on SGI systems, email can be sent to
[EMAIL PROTECTED]
For reporting *NEW* SGI security issues, email can be sent to
[EMAIL PROTECTED] or contact your SGI support provider. A support
contract is not required for submitting a security report.
______________________________________________________________________________
This information is provided freely to all interested parties
and may be redistributed provided that it is not altered in any
way, SGI is appropriately credited and the document retains and
includes its valid PGP signature.
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