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Category:   Application (Security)  >   Anti-Trojan Vendors:   Emsi Software
Anti-Trojan Buffer Overflow in 'unacev2.dll' in Processing ACE Archives Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1016065
SecurityTracker URL:  http://securitytracker.com/id/1016065
CVE Reference:   CVE-2005-2856   (Links to External Site)
Date:  May 11 2006
Impact:   Execution of arbitrary code via network, User access via network
Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Emsi Software's Anti-Trojan. A remote user can execute arbitrary code on the target system.

A remote user can create an ACE archive containing a file with a specially crafted filename. When the archive is scanned, a buffer overflow will occur in 'unacev2.dll' and arbitrary code will be executed on the target user's system. The code will run with the privileges of the target user.

The "Search in archive files" option must be enabled for this vulnerability to be exploited.

The vendor was notified on May 8, 2006.

Secunia Research discovered this vulnerability.

Impact:   A remote user can cause arbitrary code to be executed on the target user's system.
Solution:   No solution was available at the time of this entry.

The affected product version is no longer supported and the vendor recommends upgrading to the "a-squared Anti-Malware" product.

Vendor URL:  www.emsisoft.com/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

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

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

                    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/

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



 
 


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