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ZipGenius Multiple Archive Handling Buffer Overflow
Secunia Advisory: SA17061
Release Date: 2005-10-21
Last Update: 2005-10-28
Popularity: 6,051 views

Critical:
Moderately critical
Impact: System access
Where: From remote
Solution Status: Partial Fix

Software:ZipGenius 5.x
ZipGenius 6.x

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Description:
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

The vulnerabilities have been confirmed in version 5.5.1.468 and 6.0.2.1041. Prior versions may also be affected.

Solution:
Update to version 6.0.2.1050.
http://downloads.zipgenius.it/

NOTE: Further testing has revealed that vulnerability #1 has not been completely fixed in version 6.0.2.1050. It is still possible to cause a buffer overflow via a specially crafted ZIP file.

Do not download ZIP files from untrusted sources.

Provided and/or discovered by:
Tan Chew Keong, Secunia Research.

Changelog:
2005-10-28: Updated "Solution Status" and "Solution" sections.

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

Secunia Research:
http://secunia.com/secunia_research/2005-54/advisory/

Other References:
SA14359:
http://secunia.com/advisories/14359/


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