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UNIRAS Brief -478/05 - Gentoo Linux Security Advisory: GLSA 200506-23 - Clam AntiVirus: Denial of



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 478/05 dated 27.06.05  Time: 14:30  
  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
=====

Gentoo Linux Security Advisory: GLSA 200506-23 - Clam AntiVirus: Denial of 
Service vulnerability

Detail
====== 

Andrew Toller and Stefan Kanthak discovered that a flaw in libmspack's
Quantum archive decompressor renders Clam AntiVirus vulnerable to a
Denial of Service attack.




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Gentoo Linux Security Advisory                           GLSA 200506-23
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Clam AntiVirus: Denial of Service vulnerability
      Date: June 27, 2005
      Bugs: #96960
        ID: 200506-23

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Synopsis
========

Clam AntiVirus is vulnerable to a Denial of Service attack when
processing certain Quantum archives.

Background
==========

Clam AntiVirus is a GPL anti-virus toolkit, designed for integration
with mail servers to perform attachment scanning. Clam AntiVirus also
provides a command line scanner and a tool for fetching updates of the
virus database.

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

    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  app-antivirus/clamav      < 0.86.1                      >= 0.86.1

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

Andrew Toller and Stefan Kanthak discovered that a flaw in libmspack's
Quantum archive decompressor renders Clam AntiVirus vulnerable to a
Denial of Service attack.

Impact
======

A remote attacker could exploit this vulnerability to cause a Denial of
Service by sending a specially crafted Quantum archive to the server.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Clam AntiVirus users should upgrade to the latest available
version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.86.1"

References
==========

  [ 1 ] Clam AntiVirus Release Notes
        http://sourceforge.net/project/shownotes.php?release_id=337279

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

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

  http://security.gentoo.org/glsa/glsa-200506-23.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 2005 Gentoo Foundation, 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/2.0


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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.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
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Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
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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 
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members and the community at large. 
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<End of UNIRAS Briefing>

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