Gentoo: ClamAV Remote execution of arbitrary code
Posted by Benjamin D. Thomas   
Gentoo ClamAV is vulnerable to a buffer overflow which may lead to remote execution of arbitrary code.
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Gentoo Linux Security Advisory                           GLSA 200601-07
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                                            http://security.gentoo.org/
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  Severity: High
     Title: ClamAV: Remote execution of arbitrary code
      Date: January 13, 2006
      Bugs: #118459
        ID: 200601-07

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Synopsis
========

ClamAV is vulnerable to a buffer overflow which may lead to remote
execution of arbitrary code.

Background
==========

ClamAV is a GPL virus scanner.

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

    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  app-antivirus/clamav       < 0.88                         >= 0.88

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

Zero Day Initiative (ZDI) reported a heap buffer overflow
vulnerability. The vulnerability is due to an incorrect boundary check
of the user-supplied data prior to copying it to an insufficiently
sized memory buffer. The flaw occurs when the application attempts to
handle compressed UPX files.

Impact
======

For example by sending a maliciously crafted UPX file into a mail
server that is integrated with ClamAV, a remote attacker's supplied
code could be executed with escalated privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ClamAV users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.88"

References
==========

  [ 1 ] CVE-2006-0162
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0162

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

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

  http://security.gentoo.org/glsa/glsa-200601-07.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 2006 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