-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-10:10.openssl Security Advisory The FreeBSD Project Topic: OpenSSL multiple vulnerabilities Category: contrib Module: openssl Announced: 2010-11-29 Credits: Georgi Guninski, Rob Hulswit Affects: FreeBSD 7.0 and later Corrected: 2010-11-26 22:50:58 UTC (RELENG_8, 8.1-STABLE) 2010-11-29 20:43:06 UTC (RELENG_8_1, 8.1-RELEASE-p2) 2010-11-29 20:43:06 UTC (RELENG_8_0, 8.0-RELEASE-p6) 2010-11-28 13:45:51 UTC (RELENG_7, 7.3-STABLE) 2010-11-29 20:43:06 UTC (RELENG_7_3, 7.3-RELEASE-p4) 2010-11-29 20:43:06 UTC (RELENG_7_1, 7.1-RELEASE-p16) CVE Name: CVE-2010-2939, CVE-2010-3864 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . 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. II. Problem Description A race condition exists in the OpenSSL TLS server extension code parsing when used in a multi-threaded application, which uses OpenSSL's internal caching mechanism. The race condition can lead to a buffer overflow. [CVE-2010-3864] A double free exists in the SSL client ECDH handling code, when processing specially crafted public keys with invalid prime numbers. [CVE-2010-2939] III. Impact For affected server applications, an attacker may be able to utilize the buffer overflow to crash the application or potentially run arbitrary code with the privileges of the application. [CVE-2010-3864]. It may be possible to cause a DoS or potentially execute arbitrary in the context of the user connection to a malicious SSL server. [CVE-2010-2939] IV. Workaround No workaround is available, but CVE-2010-3864 only affects FreeBSD 8.0 and later. It should also be noted that CVE-2010-3864 affects neither the Apache HTTP server nor Stunnel. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 7-STABLE or 8-STABLE, or to the RELENG_8_1, RELENG_8_0, RELENG_7_3, or RELENG_7_1 security branch dated after the correction date. 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to FreeBSD 7.1, 7.3, 8.0 and 8.1 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 7.x] # fetch http://security.FreeBSD.org/patches/SA-10:10/openssl7.patch # fetch http://security.FreeBSD.org/patches/SA-10:10/openssl7.patch.asc [FreeBSD 8.x] # fetch http://security.FreeBSD.org/patches/SA-10:10/openssl.patch # fetch http://security.FreeBSD.org/patches/SA-10:10/openssl.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch # cd /usr/src/secure/lib/libssl # make obj && make depend && make && make install NOTE: On the amd64 platform, the above procedure will not update the lib32 (i386 compatibility) libraries. On amd64 systems where the i386 compatibility libraries are used, the operating system should instead be recompiled as described in 3) To update your vulnerable system via a binary patch: Systems running 7.1-RELEASE, 7.3-RELEASE, 8.0-RELEASE or 8.1-RELEASE on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. CVS: Branch Revision Path - ------------------------------------------------------------------------- RELENG_7_3 src/UPDATING 1.507.2.34.2.6 src/sys/conf/newvers.sh 1.72.2.16.2.8 src/crypto/openssl/ssl/s3_clnt.c 1.1.1.14.2.1.4.1 RELENG_7_1 src/UPDATING 1.507.2.13.2.19 src/sys/conf/newvers.sh 1.72.2.9.2.20 src/crypto/openssl/ssl/s3_clnt.c 1.1.1.14.6.2 RELENG_8_1 src/UPDATING 1.632.2.14.2.5 src/sys/conf/newvers.sh 1.83.2.10.2.6 src/crypto/openssl/ssl/s3_clnt.c 1.3.2.1.2.1 src/crypto/openssl/ssl/t1_lib.c 1.2.2.1.2.1 RELENG_8_0 src/UPDATING 1.632.2.7.2.9 src/sys/conf/newvers.sh 1.83.2.6.2.9 src/crypto/openssl/ssl/s3_clnt.c 1.3.4.1 src/crypto/openssl/ssl/t1_lib.c 1.2.4.1 - ------------------------------------------------------------------------- Subversion: Branch/path Revision - ------------------------------------------------------------------------- stable/7/ r215997 releng/7.3/ r216063 releng/7.1/ r216063 stable/8/ r215912 releng/8.0/ r216063 releng/8.1/ r216063 - ------------------------------------------------------------------------- VII. References https://bugzilla.redhat.com/show_bug.cgi?id=649304 http://www.openssl.org/news/secadv_20101116.txt http://www.mail-archive.com/openssl-dev@openssl.org/msg28043.html http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2939 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3864 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-10:10.openssl.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 iEYEARECAAYFAkz0FdsACgkQFdaIBMps37JjAgCcC7NSDXR7P4d2y4XFF/Ce9sG1 Bs8An36Pjplsfovx6Im/NCnVgHtVgj5x =xU/h -----END PGP SIGNATURE-----