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Secunia Research 08/05/2006

- TZipBuilder ZIP File Handling Buffer Overflow Vulnerability -

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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

* TZipBuilder 1.79.03.01.

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 TZipBuilder, which
can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error when listing the
contents of a ZIP archive that contains a file with an overly long
filename. This can be exploited to cause a stack-based buffer overflow
when a specially crafted ZIP archive is opened.

Successful exploitation allows execution of arbitrary code with the
privileges of an application that uses the library.

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4) Solution

Update to version 1.79.04.00.
http://www.drehoeksw.net/ZipBuild2.html

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5) Time Table

03/05/2006 - Initial vendor notification.
03/05/2006 - Initial vendor reply.
08/05/2006 - Public disclosure.

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6) Credits

Discovered by Tan Chew Keong, Secunia Research.

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7) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2006-2161 for the vulnerability.

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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/2006-26/advisory/

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

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