Secunia Research: Anti-Trojan unacev2.dll Buffer Overflow Vulnerability

======================================================================

                Secunia Research 08/05/2006

  - Anti-Trojan unacev2.dll Buffer Overflow Vulnerability -

======================================================================
Table of Contents

Affected Software…1
Severity…2
Description of Vulnerability…3
Solution…4
Time Table…5
Credits…6
References…7
About Secunia…8
Verification…9

======================================================================
1) Affected Software

• Anti-Trojan 5.5.421.

Prior versions may also be affected.

======================================================================
2) Severity

Rating: Highly Critical
Impact: System Access
Where: Remote

======================================================================
3) Description of Vulnerability

Secunia Research has discovered a vulnerability in Anti-Trojan,
which can be exploited by malicious people to compromise a user's
system.

The vulnerability is caused due to a boundary error in UNACEV2.DLL
when extracting an ACE archive containing a file with an overly long
filename. This can be exploited to cause a stack-based buffer overflow
when a user scans a specially crafted ACE archive.

The vulnerability is related to:
SA16479

Successful exploitation requires that the "Search in archive files"
option is enabled.

======================================================================
4) Solution

Version 5.5 is no longer supported and no fix is available.

The vendor recommends existing users to upgrade to the successor
product "a-squared Anti-Malware".

======================================================================
5) Time Table

08/05/2006 - Initial vendor notification.
08/05/2006 - Initial vendor reply.
08/05/2006 - Public disclosure.

======================================================================
6) Credits

Discovered by Secunia Research.

======================================================================
7) References

SA16479:
http://secunia.com/advisories/16479/

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2005-2856 for the vulnerability.

======================================================================
8) About Secunia

Secunia collects, validates, assesses, and writes advisories regarding
all the latest software vulnerabilities disclosed to the public. These
advisories are gathered in a publicly available database at the
Secunia website:

http://secunia.com/

Secunia offers services to our customers enabling them to receive all
relevant vulnerability information to their specific system
configuration.

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/

======================================================================
9) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2006-27/advisory/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

======================================================================