Secunia Research: ALZip Multiple Archive Handling Buffer Overflow

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                     Secunia Research 05/10/2005

          - ALZip Multiple Archive Handling Buffer Overflow -

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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

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1) Affected Software 

ALZip v6.12 (Korean)
ALZip v6.1 (International)
ALZip v5.52 (English)

Prior versions may also be affected.

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2) Severity 

Rating: Moderately Critical
Impact: System access
Where:  Remote

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3) Description of Vulnerability

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

The vulnerability is caused due to multiple boundary errors when 
reading the filename of a compressed file from ALZ, ARJ, ZIP, UUE or
XXE archives. This can be exploited to cause a stack-based buffer
overflow (ALZ), or a heap-based buffer overflow (ARJ / ZIP / 
UUE / XXE).

Successful exploitation allows execution of arbitrary code when a
malicious ALZ / ARJ archive is opened, or when a ZIP / UUE / XXE
archive is extracted.

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4) Solution 

Update to version 6.13 (Korean and International)

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5) Time Table 

19/09/2005 - Initial vendor notification.
20/09/2005 - Initial vendor reply.
28/09/2005 - Notified by vendor that fixed version has been
             released.
05/10/2005 - Public disclosure.

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6) Credits 

Discovered by Tan Chew Keong, Secunia Research.

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7) References

No references available.

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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/

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9) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2005-49/advisory/

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

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