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UNIRAS Brief - 287/04 - CVS: additional DoS and arbitrary code execution vulnerabilities



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 287/04 dated 11.06.04  Time: 12:10  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

CVS: additional DoS and arbitrary code execution vulnerabilities


Detail
====== 

A team audit of the CVS source code performed by Stefan Esser and Sebastian Krahmer 
resulted in the discovery of several remotely exploitable vulnerabilities



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Gentoo Linux Security Advisory                           GLSA 200406-06
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                                            http://security.gentoo.org/
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  Severity: High
     Title: CVS: additional DoS and arbitrary code execution
            vulnerabilities
      Date: June 10, 2004
      Bugs: #53408
        ID: 200406-06

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Synopsis
========

Several serious new vulnerabilities have been found in CVS, which may allow an 
attacker to remotely compromise a CVS server.

Background
==========

CVS (Concurrent Versions System) is an open-source network-transparent version 
control system. It contains both a client utility and a server.

Affected packages
=================

    -------------------------------------------------------------------
     Package       /    Vulnerable    /                     Unaffected
    -------------------------------------------------------------------
  1  dev-util/cvs      <= 1.11.16-r1                        >= 1.11.17

Description
===========

A team audit of the CVS source code performed by Stefan Esser and Sebastian Krahmer 
resulted in the discovery of several remotely exploitable vulnerabilities including:

* no-null-termination of "Entry" lines

* error_prog_name "double-free()"

* Argument integer overflow

* serve_notify() out of bounds writes

Impact
======

An attacker could use these vulnerabilities to cause a Denial of Service or execute 
arbitrary code with the permissions of the user running cvs.

Workaround
==========

There is no known workaround at this time. All users are advised to upgrade to the 
latest available version of CVS.

Resolution
==========

All CVS users should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv ">=dev-util/cvs-1.11.17"
    # emerge ">=dev-util/cvs-1.11.17"

References
==========

  [ 1 ] E-matters Advisory 09/2004
        http://security.e-matters.de/advisories/092004.html
  [ 2 ] CAN-2004-0414
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0414
  [ 3 ] CAN-2004-0416
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0416
  [ 4 ] CAN-2004-0417
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0417
  [ 5 ] CAN-2004-0418
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0418

Availability
============

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

     http://security.gentoo.org/glsa/glsa-200406-06.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and 
security of our users machines is of utmost importance to us. Any security concerns 
should be addressed to security@xxxxxxxxxx or alternatively, you may file a bug at 
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Technologies, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0
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For additional information or assistance, please contact the HELP Desk by 
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UNIRAS wishes to acknowledge the contributions of Gentoo for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

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its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
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Neither UNIRAS or NISCC shall also accept responsibility for any errors 
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UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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