GLSA 200709-14: ClamAV: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	high
Title:	ClamAV: Multiple vulnerabilities
Date:	09/20/2007
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	Architecture(s)
app-antivirus/clamav	< 0.91.2	>= 0.91.2	All supported architectures

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

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 https://bugs.gentoo.org.