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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0749 -- [FreeBSD] Buffer overflow in OpenSSL SSL_get_shared_ciphers() 4 October 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: openssl Publisher: FreeBSD Operating System: FreeBSD Impact: Execute Arbitrary Code/Commands Access: Remote/Unauthenticated CVE Names: CVE-2007-5135 Ref: ESB-2007.0738 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-07:08.openssl.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-07:08.openssl Security Advisory The FreeBSD Project Topic: Buffer overflow in OpenSSL SSL_get_shared_ciphers() Category: contrib Module: openssl Announced: 2007-10-03 Credits: Moritz Jodeit Affects: All FreeBSD releases. Corrected: 2007-10-03 21:39:43 UTC (RELENG_6, 6.2-STABLE) 2007-10-03 21:40:35 UTC (RELENG_6_2, 6.2-RELEASE-p8) 2007-10-03 21:41:22 UTC (RELENG_6_1, 6.1-RELEASE-p20) 2007-10-03 21:42:00 UTC (RELENG_5, 5.5-STABLE) 2007-10-03 21:42:32 UTC (RELENG_5_5, 5.5-RELEASE-p16) CVE Name: CVE-2007-5135 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://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, and 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 buffer overflow addressed in FreeBSD-SA-06:23.openssl has been found to be incorrectly fixed. III. Impact For applications using the SSL_get_shared_ciphers() function, the buffer overflow could allow an attacker to crash or potentially execute arbitrary code with the permissions of the user running the application. IV. Workaround No workaround is available, but only applications using the SSL_get_shared_ciphers() function are affected. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the correction date. 2) To patch your present system: The following patch have been verified to apply to FreeBSD 5.5, 6.1, and 6.2 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch http://security.FreeBSD.org/patches/SA-07:08/openssl.patch # fetch http://security.FreeBSD.org/patches/SA-07:08/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 VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision Path - - ------------------------------------------------------------------------- RELENG_5 src/crypto/openssl/ssl/ssl_lib.c 1.1.1.11.2.3 RELENG_5_5 src/UPDATING 1.342.2.35.2.16 src/sys/conf/newvers.sh 1.62.2.21.2.18 src/crypto/openssl/ssl/ssl_lib.c 1.1.1.11.2.1.4.2 RELENG_6 src/crypto/openssl/ssl/ssl_lib.c 1.1.1.12.2.2 RELENG_6_2 src/UPDATING 1.416.2.29.2.11 src/sys/conf/newvers.sh 1.69.2.13.2.11 src/crypto/openssl/ssl/ssl_lib.c 1.1.1.12.2.1.2.1 RELENG_6_1 src/UPDATING 1.416.2.22.2.22 src/sys/conf/newvers.sh 1.69.2.11.2.22 src/crypto/openssl/ssl/ssl_lib.c 1.1.1.12.6.2 - - ------------------------------------------------------------------------- VII. References http://marc.info/?l=bugtraq&m=119091888624735 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3738 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5135 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-07:08.openssl.asc - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHBA+HFdaIBMps37IRAtTQAJ0bFBZt7DVJzhQkUcu7VdNS7Kj8cwCeMQaS cNFjW3j2eolZhlee83l3blo= =zwC2 - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBRwQ3Hyh9+71yA2DNAQI9fQP/SDS18t1EAWd3Vifu/QShdGbVuWW622WJ 3CLOqWK94Bt3IVMsBcBQtLksYwUetYV0Mkm+BDOw2EKkL3GFUeBaWzEHUvSSTKzM 6fdzQzZRbhf5GKBWj4b6SUVZwS7INn2mJxYCMLbz3Mi0BYx+wSaVbz/DsHUN9Fh5 szd2FEAXf0o= =r1AZ -----END PGP SIGNATURE-----