Clam AntiVirus ClamAV rebuildpe Heap Overflow Vulnerability
iDefense Security Advisory 10.15.06
Oct 15, 2006
Clam AntiVirus is a multi-platform GPL anti-virus toolkit. The main
purpose of which is integration into electronic mail servers. More
information is available from http://clamav.net/
Remote exploitation of a buffer overflow in Clam AntiVirus allows
attackers to potentially execute arbitrary code or cause a denial of
This vulnerability specifically exists within code dealing PE (Portable
Executable) format files. While processing certain PE elements, two
variables can be very large and integer overflow could occur. This would
result in less memory being allocated than was expected by the
programmer and subsequent code would overflow the heap buffer.
Successful exploitation requires an attacker to send a specially
constructed executable file through a mail gateway or personal anti-
virus client utilizing the ClamAV scanning engine.
iDefense has confirmed this vulnerability on version 0.88.1 and 0.88.4
of ClamAV. All previous versions are suspected to be vulnerable to this
iDefense is not aware of any effective workarounds.
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-2006-4182 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
VIII. DISCLOSURE TIMELINE
08/16/2006 Initial vendor notification
08/20/2006 Initial vendor response
10/10/2006 Second vendor notification
10/15/2006 Coordinated public disclosure
The discovery of this vulnerability is credited to Damian Put