Gentoo: Clam AntiVirus Denial of Service vulnerability
Posted by Benjamin D. Thomas   
Gentoo Clam AntiVirus is vulnerable to a Denial of Service attack when processing certain Quantum archives.
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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@gentoo.org 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