Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2004.0280 -- FreeBSD-SA-04:07.cvs CVS path validation errors 16 April 2004 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: CVS Publisher: FreeBSD Operating System: FreeBSD BSD Impact: Overwrite Arbitrary Files Access Required: Remote CVE Names: CAN-2004-0180 Ref: ESB-2004.0273 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-04:07.cvs Security Advisory The FreeBSD Project Topic: CVS path validation errors Category: contrib Module: contrib_cvs Announced: 2004-04-15 Credits: Sebastian Krahmer <krahmer@suse.de> Derek Robert Price <derek@ximbiot.com> Affects: All FreeBSD versions prior to 4.10-RELEASE Corrected: 2004-04-15 15:35:26 UTC (RELENG_4, 4.10-BETA) 2004-04-15 15:42:50 UTC (RELENG_5_2, 5.2.1-RELEASE-p5) 2004-04-15 15:59:05 UTC (RELENG_4_9, 4.9-RELEASE-p18) 2004-04-15 15:59:54 UTC (RELENG_4_8, 4.8-RELEASE-p5) CVE Name: CAN-2004-0180 FreeBSD only: NO For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://www.freebsd.org/security/>. I. Background The Concurrent Versions System (CVS) is a version control system. It may be used to access a repository locally, or to access a `remote repository' using a number of different methods. When accessing a remote repository, the target machine runs the CVS server to fulfill client requests. II. Problem Description Two programming errors were discovered in which path names handled by CVS were not properly validated. In one case, the CVS client accepts absolute path names from the server when determining which files to update. In another case, the CVS server accepts relative path names from the client when determining which files to transmit, including those containing references to parent directories (`../'). III. Impact These programming errors generally only have a security impact when dealing with remote CVS repositories. A malicious CVS server may cause a CVS client to overwrite arbitrary files on the client's system. A CVS client may request RCS files from a remote system other than those in the repository specified by $CVSROOT. These RCS files need not be part of any CVS repository themselves. IV. Workaround Disable remote CVS repository operations. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 4-STABLE; or to the RELENG_5_2, RELENG_4_9, or RELENG_4_8 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 4.8, 4.9, 5.1, and 5.2 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:07/cvs.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:07/cvs.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch # cd /usr/src/gnu/usr.bin/cvs # 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_4 src/contrib/cvs/src/client.c 1.2.2.7 src/contrib/cvs/src/modules.c 1.1.1.5.2.4 RELENG_5_2 src/UPDATING 1.282.2.13 src/sys/conf/newvers.sh 1.56.2.12 src/contrib/cvs/src/client.c 1.10.4.1 src/contrib/cvs/src/modules.c 1.1.1.8.6.2 RELENG_4_9 src/UPDATING 1.73.2.89.2.6 src/sys/conf/newvers.sh 1.44.2.32.2.6 src/contrib/cvs/src/client.c 1.2.2.6.4.1 src/contrib/cvs/src/modules.c 1.1.1.5.2.3.4.1 RELENG_4_8 src/UPDATING 1.73.2.80.2.21 src/sys/conf/newvers.sh 1.44.2.29.2.19 src/contrib/cvs/src/client.c 1.2.2.6.2.1 src/contrib/cvs/src/modules.c 1.1.1.5.2.3.2.1 - - ------------------------------------------------------------------------- VII. References http://ccvs.cvshome.org/servlets/NewsItemView?newsID=102 - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAft2oFdaIBMps37IRAm4uAKCU/QlA4N1hKaTdk3gCCfv0JHB1DQCfe7zf /ykriUr0/2wxi+lK17lQJl0= =mNSU - -----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. 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 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 iQCVAwUBQH9UVCh9+71yA2DNAQLm1QP/f9FmTy/JN1gRU2jOaZYOiE974oGwHkhg CL7j109hudCPTi40Ia0yv7U0NEv71aCLCsHg87ufCJRWNOihDsos7IPQmlkp2WMq katFDjk9D1iY9erH3gvHL5CPSE5vlfAyxseU7+w55nFzjfhy1PwZ8VS4BxrMk+Zc /+V4k7K6MQ8= =yIj9 -----END PGP SIGNATURE-----