3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
148 lines
5.6 KiB
Text
148 lines
5.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:20.cvsbug Security Advisory
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The FreeBSD Project
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Topic: Race condition in cvsbug
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Category: contrib
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Module: contrib_cvs
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Announced: 2005-09-07
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Credits: Marcus Meissner
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Affects: All FreeBSD releases
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Corrected: 2005-09-07 13:43:05 UTC (RELENG_6, 6.0-BETA5)
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2005-09-07 13:43:23 UTC (RELENG_5, 5.4-STABLE)
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2005-09-07 13:43:36 UTC (RELENG_5_4, 5.4-RELEASE-p7)
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2005-09-09 19:26:19 UTC (RELENG_5_3, 5.3-RELEASE-p22)
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2005-09-07 13:44:06 UTC (RELENG_4, 4.11-STABLE)
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2005-09-07 13:44:20 UTC (RELENG_4_11, 4.11-RELEASE-p12)
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2005-09-09 19:24:22 UTC (RELENG_4_10, 4.10-RELEASE-p18)
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CVE Name: CAN-2005-2693
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit
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<URL:http://www.freebsd.org/security/>.
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0. Revision History
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v1.0 2005-07-07 Initial release.
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v1.1 2005-07-09 Additional related issues fixed in FreeBSD 4.10 and 5.3.
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I. Background
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cvsbug(1) is a utility for reporting problems in the CVS revision
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control system. It is based on the GNATS send-pr(1) utility.
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II. Problem Description
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A temporary file is created, used, deleted, and then re-created with
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the same name. This creates a window during which an attacker could
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replace the file with a link to another file. While cvsbug(1) is based
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on the send-pr(1) utility, this problem does not exist in the version
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of send-pr(1) distributed with FreeBSD.
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In FreeBSD 4.10 and 5.3, some additional problems exist concerning
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temporary file usage in both cvsbug(1) and send-pr(1).
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III. Impact
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A local attacker could cause data to be written to any file to which
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the user running cvsbug(1) (or send-pr(1) in FreeBSD 4.10 and 5.3) has
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write access. This may cause damage in itself (e.g., by destroying
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important system files or documents) or may be used to obtain elevated
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privileges.
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IV. Workaround
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Do not use the cvsbug(1) utility on any system with untrusted users.
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Do not use the send-pr(1) utility on a FreeBSD 4.10 or 5.3 system with
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untrusted users.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the
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RELENG_5_4, RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch
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dated after the correction date.
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2) To patch your present system:
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The following patches have been verified to apply to FreeBSD 4.10,
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4.11, 5.3, and 5.4 systems.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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[FreeBSD 4.10]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:20/cvsbug410.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:20/cvsbug410.patch.asc
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[FreeBSD 5.3]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:20/cvsbug53.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:20/cvsbug53.patch.asc
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[FreeBSD 4.11 and 5.4]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:20/cvsbug.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:20/cvsbug.patch.asc
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b) Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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# cd /usr/src/gnu/usr.bin/cvs/cvsbug
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# make obj && make depend && make && make install
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# cd /usr/src/gnu/usr.bin/send-pr
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# make obj && make depend && make && make install
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VI. Correction details
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The following list contains the revision numbers of each file that was
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corrected in FreeBSD.
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Branch Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_4
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src/contrib/cvs/src/cvsbug.in 1.1.1.1.2.4
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.13
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src/sys/conf/newvers.sh 1.44.2.39.2.16
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src/contrib/cvs/src/cvsbug.in 1.1.1.1.2.3.2.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.19
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src/sys/conf/newvers.sh 1.44.2.34.2.20
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src/contrib/cvs/src/cvsbug.in 1.1.1.1.2.2.6.2
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src/gnu/usr.bin/send-pr/send-pr.sh 1.13.2.13.2.1
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RELENG_5
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src/contrib/cvs/src/cvsbug.in 1.1.1.3.2.1
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.16
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src/sys/conf/newvers.sh 1.62.2.18.2.12
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src/contrib/cvs/src/cvsbug.in 1.1.1.3.6.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.25
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src/sys/conf/newvers.sh 1.62.2.15.2.27
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src/contrib/cvs/src/cvsbug.in 1.1.1.3.4.1
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src/gnu/usr.bin/send-pr/send-pr.sh 1.35.6.1
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RELENG_6
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src/contrib/cvs/src/cvsbug.in 1.1.1.3.8.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2693
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The latest revision of this advisory is available at
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ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:20.cvsbug.asc
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