[NT] 7-Zip ARJ Archive Buffer Overflow

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To: list@securiteam.com
Date: 29 Sep 2005 10:52:15 +0200

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  7-Zip ARJ Archive Buffer Overflow
------------------------------------------------------------------------

SUMMARY

" <http://www.7-zip.org/> 7-Zip is a file archiver with high compression
ratio."

7-Zip vulnerable to a buffer overflow that allow attackers to execute
arbitrary code by sending the victim a malicious .ARJ archive file.

DETAILS

Vulnerable Systems:
 * 7-Zip version 3.13
 * 7-Zip version 4.23
 * 7-Zip version 4.26 BETA

Immune Systems:
 * 7-Zip version 4.27 BETA

The vulnerability is caused due to a boundary error when handling an ARJ
block that is larger than 2600 bytes. This can be exploited to cause a
stack-based buffer overflow when a specially crafted ARJ file is opened.

Successful exploitation allows arbitrary code execution.

Disclosure Timeline:
05/09/2005 - Initial vendor notification
05/09/2005 - Initial vendor reply
21/09/2005 - Vendor released fixed version
23/09/2005 - Public disclosure

ADDITIONAL INFORMATION

The information has been provided by <mailto:vuln@secunia.com> Secunia
Research .
The original article can be found at:
<http://secunia.com/advisories/16664/>
http://secunia.com/advisories/16664/

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