[ GLSA 200709-14 ] ClamAV: Multiple vulnerabilities

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200709-14
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                                            http://security.gentoo.org/
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  Severity: High
     Title: ClamAV: Multiple vulnerabilities
      Date: September 20, 2007
      Bugs: #189912
        ID: 200709-14

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Synopsis
========

Vulnerabilities have been discovered in ClamAV allowing remote
execution of arbitrary code and Denial of Service attacks.

Background
==========

Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX,
designed especially for e-mail scanning on mail gateways.

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

    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  app-antivirus/clamav      < 0.91.2                      >= 0.91.2

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

Nikolaos Rangos discovered a vulnerability in ClamAV which exists
because the recipient address extracted from email messages is not
properly sanitized before being used in a call to "popen()" when
executing sendmail (CVE-2007-4560). Also, NULL-pointer dereference
errors exist within the "cli_scanrtf()" function in libclamav/rtf.c and
Stefanos Stamatis discovered a NULL-pointer dereference vulnerability
within the "cli_html_normalise()" function in libclamav/htmlnorm.c
(CVE-2007-4510).

Impact
======

The unsanitized recipient address can be exploited to execute arbitrary
code with the privileges of the clamav-milter process by sending an
email with a specially crafted recipient address to the affected
system. Also, the NULL-pointer dereference errors can be exploited to
crash ClamAV. Successful exploitation of the latter vulnerability
requires that clamav-milter is started with the "black hole" mode
activated, which is not enabled by default.

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-0.91.2"

References
==========

  [ 1 ] CVE-2007-4510
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4510
  [ 2 ] CVE-2007-4560
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4560

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

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

  http://security.gentoo.org/glsa/glsa-200709-14.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 2007 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/2.5

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