[UNIX] Clam Antivirus Code Execution Vulnerability

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To: list@securiteam.com
Date: 6 Nov 2005 13:33:06 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Clam Antivirus Code Execution Vulnerability
------------------------------------------------------------------------

SUMMARY

Clam AntiVirus is "a GPL anti-virus toolkit for UNIX. The main purpose of
this software is the integration with mail servers (attachment scanning)".

The following vulnerability allows remote attackers to execute arbitrary
code on vulnerable ClamAV installations.

DETAILS

Vulnerable Systems:
 * Clam AntiVirus versions 0.80 through 0.87

Immune Systems:
 * Clam AntiVirus versions 0.87.1 available from
<http://sourceforge.net/project/showfiles.php?group_id=86638> here

This specific flaw exists within libclamav/fsg.c during the unpacking of
executable files compressed with FSG v1.33. Due to invalid bounds checking
when copying user-supplied data to heap allocated memory, an exploitable
memory corruption condition is created. The unpacking algorithm for other
versions of FSG is not affected.

Disclosure Timeline:
24.10.05 - Vulnerability reported to vendor
24.10.05 - Digital Vaccine released to TippingPoint customers
25.10.05 - Vulnerability information provided to ZDI security partners
04.11.05 - Public release of advisory

ADDITIONAL INFORMATION

The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-05-002.html>
http://www.zerodayinitiative.com/advisories/ZDI-05-002.html

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