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Secunia Research: unalz Filename Handling Directory Traversal Vulnerability

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                     Secunia Research 13/03/2006

     - unalz Filename Handling Directory Traversal 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 

* unalz version 0.53.

Other versions may also be affected.

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2) Severity 

Rating: Less Critical
Impact: System access
Where:  Remote

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3) Description of Vulnerability

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

The vulnerability is caused due to an input validation error when
extracting an ALZ archive. This makes it possible to have files
extracted to arbitrary locations outside the specified directory
using the "../" directory traversal sequence.

The vulnerability has been confirmed in version 0.53. Other version
may also be affected.

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4) Solution 

Update to version 0.55. 

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5) Time Table 

02/03/2006 - Initial vendor notification.
10/03/2006 - Initial vendor reply.
13/03/2006 - 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-2006-0950 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/2006-16/advisory/

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

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