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Vulnerability Note VU#385908

Clam AntiVirus vulnerable to memory corruption via specially crafted UPX packed file

Overview

A vulnerability in the ClamAV antivirus toolkit may allow a remote attacker to execute arbitrary code on a vulnerable system.

I. Description

Clam AntiVirus is an antivirus toolkit for Unix-like systems that is commonly integrated with mail servers for email attachment scanning. It supports a number of different file formats, including the Ultimate Packer for eXecutables (UPX).


A size calculation flaw exists in the way ClamAV handles the unpacking of executable files compressed with UPX. This flaw could result in corruption of heap memory, allowing an attacker to execute code supplied in a specially crafted UPX file.

II. Impact

A remote unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. The attacker-supplied code would be executed with the privileges of the running ClamAV process.

III. Solution

Upgrade


The ClamAV project has released version 0.88 in response to this issue. Users who compile ClamAV from the original source code are encouraged to upgrade to this version.
Users who obtain ClamAV from their operating system vendor are encouraged to review the Systems Affected section of this document for more information.

Systems Affected

VendorStatusDate NotifiedDate Updated
Gentoo LinuxVulnerable16-Jan-2006
Trustix Secure LinuxVulnerable16-Jan-2006

References


http://www.clamav.net/doc/0.88/ChangeLog
http://secunia.com/advisories/18379/
http://www.zerodayinitiative.com/advisories/ZDI-06-001.html
http://www.auscert.org.au/5924
http://securitytracker.com/alerts/2006/Jan/1015457.html

Credit

Thanks to ClamAV for reporting this vulnerability.

This document was written by Chad R Dougherty.

Other Information

Date Public:2006-01-09
Date First Published:2006-01-16
Date Last Updated:2006-01-16
CERT Advisory: 
CVE-ID(s):CVE-2006-0162
NVD-ID(s):CVE-2006-0162
US-CERT Technical Alerts: 
Metric:26.72
Document Revision:9

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