Date: Thu, 20 Sep 2007 23:51:35 +0200
From: Pierre-Yves Rofes <py@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200709-14 ] ClamAV: Multiple vulnerabilities
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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
=================
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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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