Vulnerability Note VU#363713

Clam AntiVirus contains a buffer overflow vulnerability

Overview

A buffer overflow in Clam AntiVirus (ClamAV) may allow a remote attacker to execute arbitrary code.

I. Description

Clam AntiVirus is a UNIX-based, anti-virus toolkit often deployed with mail servers to detect malicious attachments. A signedness error in ClamAV (libclamav/upx.c) may allow a buffer overflow to occur. If a remote attacker sends a specially crafted UPX-packed executable to a vulnerable ClamAV installation, that attacker may be able to trigger the buffer overflow.

II. Impact

A remote attacker may be able to execute arbitrary code with the privileges of the application linked to the ClamAV process. In addition, this vulnerability may prevent ClamAV from detecting malicious UPX-packed executables.

III. Solution

Upgrade

This issue was corrected in ClamAV 0.87.

Do not access UPX-packed executables from untrusted sources

Exploitation occurs by via specially crafted UPX-packed executables. By only accessing UPX-packed executables from trusted or known sources, the chances of exploitation are reduced.

Systems Affected

Vendor	Status	Date Updated
Apple Computer, Inc.	Unknown	27-Sep-2005
Clam AntiVirus	Vulnerable	20-Oct-2005
Conectiva Inc.	Unknown	21-Oct-2005
Cray Inc.	Unknown	21-Oct-2005
Debian Linux	Vulnerable	3-Nov-2005
EMC, Inc. (formerly Data General Corporation)	Unknown	21-Oct-2005
Engarde Secure Linux	Unknown	27-Sep-2005
F5 Networks, Inc.	Not Vulnerable	24-Oct-2005
Fedora Project	Unknown	27-Sep-2005
FreeBSD, Inc.	Vulnerable	24-Oct-2005
Fujitsu	Unknown	21-Oct-2005
Gentoo Linux	Unknown	27-Sep-2005
Hewlett-Packard Company	Unknown	27-Sep-2005
Hitachi	Not Vulnerable	24-Oct-2005
IBM Corporation	Unknown	27-Sep-2005
IBM Corporation (zseries)	Unknown	27-Sep-2005
IBM eServer	Unknown	27-Sep-2005
Immunix Communications, Inc.	Unknown	27-Sep-2005
Ingrian Networks, Inc.	Unknown	27-Sep-2005
Juniper Networks, Inc.	Unknown	21-Oct-2005
Mandriva, Inc.	Vulnerable	28-Sep-2005
Microsoft Corporation	Not Vulnerable	21-Oct-2005
MontaVista Software, Inc.	Unknown	27-Sep-2005
NEC Corporation	Unknown	21-Oct-2005
NetBSD	Unknown	21-Oct-2005
Novell, Inc.	Unknown	27-Sep-2005
OpenBSD	Unknown	21-Oct-2005
Openwall GNU/*/Linux	Not Vulnerable	27-Sep-2005
QNX, Software Systems, Inc.	Unknown	21-Oct-2005
Red Hat, Inc.	Not Vulnerable	29-Sep-2005
Sequent Computer Systems, Inc.	Unknown	27-Sep-2005
Silicon Graphics, Inc.	Unknown	21-Oct-2005
Slackware Linux Inc.	Not Vulnerable	24-Oct-2005
Sony Corporation	Unknown	21-Oct-2005
Sun Microsystems, Inc.	Not Vulnerable	27-Sep-2005
SUSE Linux	Unknown	27-Sep-2005
The SCO Group	Unknown	21-Oct-2005
The SCO Group (SCO Linux)	Unknown	27-Sep-2005
Trustix Secure Linux	Unknown	27-Sep-2005
Turbolinux	Unknown	27-Sep-2005
Ubuntu	Vulnerable	28-Sep-2005
Unisys	Unknown	21-Oct-2005
Wind River Systems, Inc.	Unknown	21-Oct-2005

References

http://secunia.com/advisories/16848/
http://sourceforge.net/project/shownotes.php?release_id=356974
http://www.securityfocus.com/bid/14866
http://www.gentoo.org/security/en/glsa/glsa-200509-13.xml
http://www.clamav.net/
http://www.mandriva.com/security/advisories?name=MDKSA-2005:166

Credit

This vulnerability was reported by Thierry Carrez.

This document was written by Jeff Gennari.

Other Information

Date Public	09/19/2005
Date First Published	10/21/2005 09:44:31 AM
Date Last Updated	11/03/2005
CERT Advisory
CVE-ID(s)	CAN-2005-2920
NVD-ID(s)	CAN-2005-2920
US-CERT Technical Alerts
Metric	6.75
Document Revision	45

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Produced 2005 by US-CERT, a government organization
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