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AUSCERT External Security Bulletin Redistribution
ESB-2004.0356 -- FreeBSD-SA-04:10.cvs
CVS pserver protocol parser errors
20 May 2004
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: cvs
Publisher: FreeBSD
Operating System: FreeBSD
BSD
Impact: Execute Arbitrary Code/Commands
Access Required: Remote
Comment: CVE Names: CAN-2004-0396
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FreeBSD-SA-04:10.cvs Security Advisory
The FreeBSD Project
Topic: CVS pserver protocol parser errors
Category: contrib
Module: contrib_cvs
Announced: 2004-05-19
Credits: Stefan Esser <s.esser@e-matters.de>
Affects: All FreeBSD versions
Corrected: 2004-05-18 07:21:57 UTC (RELENG_4, 4.10-PRERELEASE)
2004-05-18 07:16:53 UTC (RELENG_4_10, 4.10-RC)
2004-05-18 07:19:55 UTC (RELENG_4_9, 4.9-RELEASE-p8)
2004-05-18 07:19:55 UTC (RELENG_4_8, 4.8-RELEASE-p21)
2004-05-18 07:19:54 UTC (RELENG_4_7, 4.7-RELEASE-p27)
2004-05-18 07:19:57 UTC (RELENG_5_2, 5.2.1-RELEASE-p7)
2004-05-18 07:19:57 UTC (RELENG_5_1, 5.1-RELEASE-p17)
2004-05-18 07:19:56 UTC (RELENG_5_0, 5.0-RELEASE-p21)
CVE Name: CAN-2004-0396
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
Due to a programming error in code used to parse data received from
the client, malformed data can cause a heap buffer to overflow,
allowing the client to overwrite arbitrary portions of the server's
memory.
III. Impact
A malicious CVS client may run arbitrary code on the server at the
privilege level of the CVS server software.
IV. Workaround
Administrators of CVS repositories should disable remote access
through the "pserver" mechanism. CVS servers which only allow remote
access through the "ext" mechanism (using RSH or SSH) are not
affected.
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 4.7, 4.8,
4.9, 4.10, 5.0, 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-04:10/cvs.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:10/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/server.c 1.13.2.6
RELENG_4_10
src/contrib/cvs/src/server.c 1.13.2.5.6.1
RELENG_4_9
src/UPDATING 1.73.2.89.2.9
src/sys/conf/newvers.sh 1.44.2.32.2.9
src/contrib/cvs/src/server.c 1.13.2.5.4.1
RELENG_4_8
src/UPDATING 1.73.2.80.2.24
src/sys/conf/newvers.sh 1.44.2.29.2.22
src/contrib/cvs/src/server.c 1.13.2.5.2.1
RELENG_4_7
src/UPDATING 1.73.2.74.2.31
src/sys/conf/newvers.sh 1.44.2.26.2.29
src/contrib/cvs/src/server.c 1.13.2.2.6.2
RELENG_5_2
src/UPDATING 1.282.2.15
src/sys/conf/newvers.sh 1.56.2.14
src/contrib/cvs/src/server.c 1.19.4.2
RELENG_5_1
src/UPDATING 1.251.2.19
src/sys/conf/newvers.sh 1.50.2.19
src/contrib/cvs/src/server.c 1.19.2.1
RELENG_5_0
src/UPDATING 1.229.2.27
src/sys/conf/newvers.sh 1.48.2.22
src/contrib/cvs/src/server.c 1.17.2.2
- - - -------------------------------------------------------------------------
VII. References
http://ccvs.cvshome.org/servlets/NewsItemView?newsID=104
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