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Category:   Application (Generic)  >   CVS Vendors:   GNU [multiple authors]
(FreeBSD Issues Fix) CVS Entry Line Heap Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1010211
SecurityTracker URL:  http://securitytracker.com/id/1010211
CVE Reference:   CAN-2004-0396   (Links to External Site)
Date:  May 19 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.11.15 and prior versions (stable); 1.12.7 and prior versions (feature)
Description:   A heap overflow vulnerability was reported in Concurrent Versions System (CVS) in the processing of entry lines. A remote user can execute arbitrary code on the target system.

Stefan Esser of e-matters GmbH reported that the overflow occurs when an entry line is processed to determine if the modified and unchanged flags apply. A remote user can reportedly cause the flawed function to be called several times, inserting certain characters into the entry line and overwriting memory.

The vendor was reportedly notified on May 2, 2004.

The original advisory is available at:

http://security.e-matters.de/advisories/072004.html
Impact:   A remote user can execute arbitrary code on the target system with the privileges of the CVS server.
Solution:   FreeBSD has released a fix and indicates that users should perform one of the following [quoted]:

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
Vendor URL:  www.cvshome.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   UNIX (FreeBSD)

Message History:   This archive entry is a follow-up to the message listed below.
May 19 2004 CVS Entry Line Heap Overflow Lets Remote Users Execute Arbitrary Code


 Source Message Contents
Date:  Wed, 19 May 2004 09:25:16 +0200 (CEST)
Subject:  FreeBSD Security Advisory FreeBSD-SA-04:10.cvs


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=============================================================================
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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (FreeBSD)

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SPFgXGZog6YaYxDO7V4juKc=
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