BugTraq
Secunia Research: unalz Filename Handling Directory TraversalVulnerability Mar 13 2006 04:06PM
Secunia Research (remove-vuln secunia com)
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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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