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                     Secunia Research 21/10/2005

       - ZipGenius 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 

ZipGenius Version 5.5.1.468 and 6.0.2.1041.

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 some vulnerabilities in ZipGenius,
which can be exploited by malicious people to compromise a user's
system. 

1) A boundary error exists in "zipgenius.exe", "zg.exe", "zgtips.dll",
and "contmenu.dll" when reading the filename of a compressed file
from a ZIP archive. This can be exploited to cause a stack-based
buffer overflow when a malicious archive containing a file with an
overly long filename is read either in ZipGenius or from Windows
Explorer.

2) A boundary error exists in "zipgenius.exe" when handling the 
original name of a UUE/XXE/MIM encoded file. This can be exploited
to cause a stack-based buffer overflow when a malicious UUE/XXE/MIM 
archive containing an encoded file with an overly long filename is 
opened.

3) A boundary error exists 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 malicious
ACE archive is extracted using "zipgenius.exe" or "zg.exe".

Vulnerability #3 is related to:
SA14359

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4) Solution 

Update to version 6.0.2.1050.

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5) Time Table 

04/10/2005 - Initial vendor notification.
05/10/2005 - Initial vendor reply.
20/10/2005 - Vendor released fixed version.
21/10/2005 - Public disclosure.

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6) Credits 

Discovered by Tan Chew Keong, Secunia Research.

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7) References

ZipGenius:
http://forum.zipgenius.it/index.php?showtopic=684 

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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/2005-54/advisory/ 

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

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