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Clam AntiVirus CAB/FSG File Handling and base64 MIME Vulnerabilities Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA17434  
Release Date: 2005-11-04
Last Update: 2006-12-13

Critical:
Highly critical
Impact: DoS
System access
Where: From remote
Solution Status: Vendor Patch

Software:Clam AntiVirus (clamav) 0.x

CVE reference:CVE-2005-3303 (Secunia mirror)
CVE-2005-3500 (Secunia mirror)
CVE-2005-3501 (Secunia mirror)
CVE-2006-5874 (Secunia mirror)

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Description:
Some vulnerabilities have been reported in Clam AntiVirus (clamav), which can be exploited by malicious people to cause a DoS (Denial of Service) and to compromise a vulnerable system.

1) A boundary error in "libclamav/fsg.c" when unpacking FSG v1.33 compressed executable file can cause a heap-based buffer overflow and can be exploited to execute arbitrary code.

2) A validation error in "libclamav/tnef.c" when handling a CAB file with a malformed header can cause the same block in the file to be scanned repeatedly. This can be exploited to cause an infinite loop, potentially causing a DoS, via a specially crafted CAB file.

3) An error in "libclamav/mspack/cabd.c" when handling a CAB file with a malformed header can cause an infinite loop in the "cabd_find()" function. This can potentially be exploited to cause a DoS via a specially crafted CAB file.

4) A NULL pointer dereference exists when handling malformed base64 encoded MIME attachments. This can be exploited to cause a DoS via specially crafted MIME attachments.

The vulnerabilities have been reported in versions 0.87 and prior.

Solution:
Update to version 0.87.1.
http://sourceforge.net/project/showfiles.php?group_id=86638

Provided and/or discovered by:
1) 3Com's Zero Day Initiative.
2-3) iDEFENSE.
4) Stephen Gran

Changelog:
2005-11-07: Updated "Critical", "Impact", "Description" and credit sections. Added links to "Original Advisory".
2005-11-08: Added CVE references.
2005-12-15: Corrected credit and "Original Advisory" sections.
2006-12-12: Added additional vulnerability reported by Stephen Gran.

Original Advisory:
3Com's Zero Day Initiative:
http://www.zerodayinitiative.com/advisories/ZDI-05-002.html

iDEFENSE:
http://www.idefense.com/application/poi/display?id=333&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=334&type=vulnerabilities

Debian:
http://www.us.debian.org/security/2006/dsa-1232



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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