[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-16:33.openssh
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 = FreeBSD-SA-16:33.opensshSecurity Advisory The FreeBSD Project Topic: OpenSSH Remote Denial of Service vulnerability Category: contrib Module: OpenSSH Announced: 2016-11-02 Affects:All supported versions of FreeBSD. Corrected: 2016-11-02 06:56:35 UTC (stable/11, 11.0-STABLE) 2016-11-02 07:23:19 UTC (releng/11.0, 11.0-RELEASE-p3) 2016-11-02 06:58:47 UTC (stable/10, 10.3-STABLE) 2016-11-02 07:23:36 UTC (releng/10.3, 10.3-RELEASE-p12) CVE Name: CVE-2016-8858 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit https://security.FreeBSD.org/>. I. Background OpenSSH is an implementation of the SSH protocol suite, providing an encrypted and authenticated transport for a variety of services, including remote shell access. During the SSH handshake procedure, the client and server exchanges the supported encryption, MAC and compression algorithms along with other information to negotiate algorithms for initial key exchange, with a message named SSH_MSG_KEXINIT. II. Problem Description When processing the SSH_MSG_KEXINIT message, the server could allocate up to a few hundreds of megabytes of memory per each connection, before any authentication take place. III. Impact A remote attacker may be able to cause a SSH server to allocate an excessive amount of memory. Note that the default MaxStartups setting on FreeBSD will limit the effectiveness of this attack. IV. Workaround No workaround is available, but systems where sshd(8) is not used are not vulnerable. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. The sshd(8) service has to be restarted after the update. A reboot is recommended but not required. 2) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install The sshd(8) service has to be restarted after the update. A reboot is recommended but not required. 3) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/SA-16:33/openssh.patch # fetch https://security.FreeBSD.org/patches/SA-16:33/openssh.patch.asc # gpg --verify openssh.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in https://www.FreeBSD.org/handbook/makeworld.html>. The sshd(8) service has to be restarted after the update. A reboot is recommended but not required. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - stable/10/r308199 releng/10.3/ r308203 stable/11/r308198 releng/11.0/ r308202 - - To see which files were modified by a particular revision, run the following command, replacing NN with the revision number, on a machine with Subversion installed: # svn diff -cNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NN with the revision number: https://svnweb.freebsd.org/base?view=revision&revision=NN> VII. References http://seclists.org/oss-sec/2016/q4/195> https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8858> The latest revision of this advisory is available at https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc> -BEGIN PGP SIGNATURE- Version: GnuPG v2.1.15 (FreeBSD) iQIcBAEBCgAGBQJYGZhkAAoJEO1n7NZdz2rnws4P/0i2V2lw3snDi4oVsX2AVkl+ bQ9iRUvgO0SSB4b8JZ8dK6wws8InDR8oihm8jBsaOYPOxu7Wz9Zua2ZAjBAY/GLB o2+2UMGKVNlP59D/pwBD3qWEjG2KYpE5hItX7iykjwDvd8c7UOLZt7oofVfq8R7D 84BkMQb9DM/1PwFI+ztMYN3uAlzsNxi0GqoHe7PBYmA5rq3QF9LoUlRyOW9KQq8Q TsBg8briGhy44XifhxU7eUsPUrxJLb5c/w3xsuzSw1AFpgSAc8IKAcrknnTdy+0c k5GfJz/84xcN1/HO6FDVtYgIoOK2C/ljCHiRAPR
[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-16:34.bind
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 = FreeBSD-SA-16:34.bind Security Advisory The FreeBSD Project Topic: BIND Remote Denial of Service vulnerability Category: contrib Module: bind Announced: 2016-11-02 Credits:ISC Affects:FreeBSD 9.x Corrected: 2016-11-02 05:13:27 UTC (stable/9, 9.3-STABLE) 2016-11-02 07:24:34 UTC (releng/9.3, 9.3-RELEASE-p50) CVE Name: CVE-2016-8864 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit https://security.FreeBSD.org/>. I. Background BIND 9 is an implementation of the Domain Name System (DNS) protocols. The named(8) daemon is an Internet Domain Name Server. II. Problem Description A defect in BIND's handling of responses containing a DNAME answer could cause a resolver to exit after encountering an assertion failure in db.c or resolver.c. During processing of a recursive response that contains a DNAME record in the answer section, BIND could stop executing after encountering an assertion error in resolver.c. III. Impact A remote attacker who could cause a server to make a query deliberately chosen to trigger the failed assertions could cause named(8) to stop, resulting in a Denial of Service condition to its clients. IV. Workaround No workaround is available, but hosts not running named(8) recursive servers are not affected. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. The named service has to be restarted after the update. A reboot is recommended but not required. 2) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install The named service has to be restarted after the update. A reboot is recommended but not required. 3) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/SA-16:34/bind.patch # fetch https://security.FreeBSD.org/patches/SA-16:34/bind.patch.asc # gpg --verify bind.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in https://www.FreeBSD.org/handbook/makeworld.html>. Restart the named service, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - stable/9/ r308193 releng/9.3/ r308205 - - To see which files were modified by a particular revision, run the following command, replacing NN with the revision number, on a machine with Subversion installed: # svn diff -cNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NN with the revision number: https://svnweb.freebsd.org/base?view=revision&revision=NN> VII. References https://kb.isc.org/article/AA-01434/> https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8864> The latest revision of this advisory is available at https://security.FreeBSD.org/advisories/FreeBSD-SA-16:34.bind.asc> -BEGIN PGP SIGNATURE- Version: GnuPG v2.1.15 (FreeBSD) iQIcBAEBCgAGBQJYGZhkAAoJEO1n7NZdz2rn14UQAOI+3haO5nI3D4wPP9EavF9j SU1yuv2ZrWaldbdv9lSHWsK5gjOjZAwK4TmZSnhe3yC3nNOJimiD5KAjHhCiQEMN xZ4L0Xtyhp6Bef7pEPdn1KgJCdufRaXt8QYx+YWz2Zk2lV78J9IRUuWNYzTleetM yNkPIfkGbIEyzMG11nZKzIQ+rjxNS+/KXJTBD4z4xpyjCwnulHuCTGNNPIGSPbbO 1rwY6NifZXRP6yCWmrQWZPV3I7eAjwtWpmU18kLf6dRbRAWa/M9f+ZCW4vR1bBoR CAX07D0VDPaUM56XCUaspKSvJ3dpJC9GjuEZVXfBoJzbfixeMqYkjgwaPGT+BxLo AxJv8PVXZiigq+0pXMGjaHdrwWW8UxkthyifGJFSffZMs4eECrIUhFe/SlMQ/5Zm WZhA28S4QqlcTpObnWVet3C9QdpBtjlodfZqmovHHWZGGcIVPbW+sVaJ3WF2ni6H OQuJucIVfKQVuv88aSRVlrtGY/KN9wjyUf4zIpyUgPL+qy3vxz2NB41mjM12ZyAi 35KIv3tR5lZIq4C062qR0zlHKldQgxaQPX4rWq7lhQkk2X8B3SjypSMBRfrAosoW p/xQGqVwX05M7F8ykcdf8vfu3iipz/JDQgSdy3aeziwO5+2xGUt5cdXWpR0gxK4M 2ajEFjl+rHAfYpDkfoGP =F1Vx -END PGP SIGNATURE- ___ freebsd-announce@fr
[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-16:35.openssl
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 = FreeBSD-SA-16:35.opensslSecurity Advisory The FreeBSD Project Topic: OpenSSL Remote DoS vulnerability Category: contrib Module: openssl Announced: 2016-11-02 Affects:FreeBSD 9.x and FreeBSD 10.x. Corrected: 2016-11-02 07:09:31 UTC (stable/10, 10.3-STABLE) 2016-11-02 07:23:36 UTC (releng/10.3, 10.3-RELEASE-p12) 2016-11-02 07:24:14 UTC (releng/10.2, 10.2-RELEASE-p25) 2016-11-02 07:24:14 UTC (releng/10.1, 10.1-RELEASE-p42) 2016-11-02 07:09:31 UTC (stable/9, 9.3-STABLE) 2016-11-02 07:24:34 UTC (releng/9.3, 9.3-RELEASE-p50) CVE Name: CVE-2016-8610 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit https://security.FreeBSD.org/>. I. Background FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. The SSL alert protocol is a way to communicate problems within a SSL/TLS session. II. Problem Description Due to improper handling of alert packets, OpenSSL would consume an excessive amount of CPU time processing undefined alert messages. III. Impact A remote attacker who can initiate handshakes with an OpenSSL based server can cause the server to consume a lot of computation power with very little bandwidth usage, and may be able to use this technique in a leveraged Denial of Service attack. IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Restart all daemons that use the library, or reboot the system. 2) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install Restart all daemons that use the library, or reboot the system. 3) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 10.x] # fetch https://security.FreeBSD.org/patches/SA-16:35/openssl-10.patch # fetch https://security.FreeBSD.org/patches/SA-16:35/openssl-10.patch.asc # gpg --verify openssl-10.patch.asc [FreeBSD 9.3] # fetch https://security.FreeBSD.org/patches/SA-16:35/openssl-9.patch # fetch https://security.FreeBSD.org/patches/SA-16:35/openssl-9.patch.asc # gpg --verify openssl-9.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in https://www.FreeBSD.org/handbook/makeworld.html>. Restart all daemons that use the library, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - stable/9/ r308200 releng/9.3/ r308205 stable/10/r308200 releng/10.1/ r308204 releng/10.2/ r308204 releng/10.3/ r308203 - - To see which files were modified by a particular revision, run the following command, replacing NN with the revision number, on a machine with Subversion installed: # svn diff -cNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NN with the revision number: https://svnweb.freebsd.org/base?view=revision&revision=NN> VII. References http://seclists.org/oss-sec/2016/q4/224> https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8610> The latest revision of this advisory is available at https://security.FreeBSD.org/advisories/FreeBSD-SA-16:35.openssl.asc> -BEGIN PGP SIGNATURE- Version: GnuPG v2.1.15 (FreeBSD) iQIcBAEBCgAGBQJYGZhkA
