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Category:   Application (Generic)  >   CVS Vendors:   GNU [multiple authors]
(Red Hat Issues Fix) CVS Heap Overflow in Processing RCS Files Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1024796
SecurityTracker URL:  http://securitytracker.com/id/1024796
CVE Reference:   CVE-2010-3846   (Links to External Site)
Date:  Nov 29 2010
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.11.23
Description:   A vulnerability was reported in CVS. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted RCS formatted file that, when checked out by the target user, will trigger a heap overflow and execute arbitrary code on the target system. The code will run with the privileges of the target user.

Ralph Loader reported this vulnerability.

Impact:   A remote user can create a file that, when checked out by the target user, will execute arbitrary code on the target user's system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0918.html

Vendor URL:  www.nongnu.org/cvs/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Nov 29 2010 CVS Heap Overflow in Processing RCS Files Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2010:0918-01] Moderate: cvs security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: cvs security update
Advisory ID:       RHSA-2010:0918-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0918.html
Issue date:        2010-11-29
CVE Names:         CVE-2010-3846 
=====================================================================

1. Summary:

An updated cvs package that fixes one security issue is now available for
Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Concurrent Version System (CVS) is a version control system that can record
the history of your files.

An array index error, leading to a heap-based buffer overflow, was found in
the way CVS applied certain delta fragment changes from input files in the
RCS (Revision Control System file) format. If an attacker in control of a
CVS repository stored a specially-crafted RCS file in that repository, and
then tricked a remote victim into checking out (updating their CVS
repository tree) a revision containing that file, it could lead to
arbitrary code execution with the privileges of the CVS server process
on the system hosting the CVS repository. (CVE-2010-3846)

Red Hat would like to thank Ralph Loader for reporting this issue.

All users of cvs are advised to upgrade to this updated package, which
contains a backported patch to correct this issue.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

642146 - CVE-2010-3846 cvs: Heap-based buffer overflow by applying RCS file changes

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/cvs-1.11.23-11.el6_0.1.src.rpm

i386:
cvs-1.11.23-11.el6_0.1.i686.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.i686.rpm

x86_64:
cvs-1.11.23-11.el6_0.1.x86_64.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/cvs-1.11.23-11.el6_0.1.src.rpm

x86_64:
cvs-1.11.23-11.el6_0.1.x86_64.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/cvs-1.11.23-11.el6_0.1.src.rpm

i386:
cvs-1.11.23-11.el6_0.1.i686.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.i686.rpm

ppc64:
cvs-1.11.23-11.el6_0.1.ppc64.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.ppc64.rpm

s390x:
cvs-1.11.23-11.el6_0.1.s390x.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.s390x.rpm

x86_64:
cvs-1.11.23-11.el6_0.1.x86_64.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/cvs-1.11.23-11.el6_0.1.src.rpm

i386:
cvs-1.11.23-11.el6_0.1.i686.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.i686.rpm

x86_64:
cvs-1.11.23-11.el6_0.1.x86_64.rpm
cvs-debuginfo-1.11.23-11.el6_0.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2010-3846.html
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2010 Red Hat, Inc.
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