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Message-ID: <4533E5AF.1060403@idefense.com> Date: Mon, 16 Oct 2006 16:03:59 -0400 From: iDefense Labs <labs-no-reply@...fense.com> To: idlabs-advisories@...fense.com, vulnwatch@...nwatch.org, full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com Subject: iDefense Security Advisory 10.15.06: Clam AntiVirus ClamAV CHM Chunk Name Length DoS Vulnerability Clam AntiVirus ClamAV CHM Chunk Name Length DoS Vulnerability iDefense Security Advisory 10.15.06 http://www.idefense.com/intelligence/vulnerabilities/ Oct 15, 2006 I. BACKGROUND Clam AntiVirus is a multi-platform GPL anti-virus toolkit. The main purpose of which is integration into electronic mail servers. More information about ClamAV can be found at http://clamav.net/. Microsoft Compressed HTML Help (CHM) files are commonly used for windows based software documentation. II. DESCRIPTION Remote exploitation of a input validation vulnerability in Clam AntiVirus's ClamAV could allow attackers to crash the virus scanning service. The vulnerability specifically exists due to improper handling of an specially crafted CHM file. While processing such a file, ClamAV may attempt to read an invalid memory location resulting in abnormal termination of the scanning service. III. ANALYSIS Successful exploitation could allow an attacker to crash the ClamAV virus scanning service. Exploitation requires that attackers send a specially constructed CHM file through an e-mail gateway or personal anti-virus client using the ClamAV scanning engine. IV. DETECTION iDefense has confirmed this vulnerability affects Clam AntiVirus ClamAV v0.88.4. All prior versions that implement CHM file scanning are suspected to be vulnerable. V. WORKAROUND iDefense is unaware of any effective workarounds for this issue. VI. VENDOR RESPONSE The ClamAV team has addressed this vulnerability within version 0.88.5. VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-5295 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 09/28/2006 Initial vendor notification 09/29/2006 Initial vendor response 10/10/2006 Second vendor notification 10/15/2006 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by Damian Put and an anonymous researcher. Get paid for vulnerability research http://www.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2006 iDefense, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@...fense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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