Secunia Research: unalz Filename Handling Directory Traversal Vulnerability
======================================================================
Secunia Research 13/03/2006
- unalz Filename Handling Directory Traversal Vulnerability -
======================================================================
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
======================================================================
1) Affected Software
* unalz version 0.53.
Other versions may also be affected.
======================================================================
2) Severity
Rating: Less Critical
Impact: System access
Where: Remote
======================================================================
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.
======================================================================
4) Solution
Update to version 0.55.
======================================================================
5) Time Table
02/03/2006 - Initial vendor notification.
10/03/2006 - Initial vendor reply.
13/03/2006 - Public disclosure.
======================================================================
6) Credits
Discovered by Tan Chew Keong, Secunia Research.
======================================================================
7) References
The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2006-0950 for the vulnerability.
======================================================================
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/
======================================================================
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/
======================================================================