GLSA 200709-14 ClamAV: Multiple vulnerabilities
Posted on: 09/20/2007 11:10 PM

A new security update has been released for Gentoo Linux - ClamAV: Multiple vulnerabilities. Here the announcement:

Gentoo Linux Security Advisory GLSA 200709-14
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Severity: High
Title: ClamAV: Multiple vulnerabilities
Date: September 20, 2007
Bugs: #189912
ID: 200709-14

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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 lt; 0.91.2 gt;= 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 "gt;=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



Printed from Linux Compatible (http://www.linuxcompatible.org/news/story/glsa_200709_14_clamav_multiple_vulnerabilities.html)