====================================================================== 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/ ======================================================================