====================================================================== Secunia Research 23/09/2005 - 7-Zip ARJ Archive Handling Buffer Overflow - ====================================================================== 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 7-Zip Version 3.13, 4.23, and 4.26 BETA Other versions may also be affected. ====================================================================== 2) Severity Rating: Moderately Critical Impact: System access Where: Remote ====================================================================== 3) Description of Vulnerability Secunia Research has discovered a vulnerability in 7-Zip, which can be exploited by malicious people to compromise a user's system. The vulnerability is caused due to a boundary error when handling an ARJ block that is larger than 2600 bytes. This can be exploited to cause a stack-based buffer overflow when a specially crafted ARJ file is opened. Successful exploitation allows arbitrary code execution. ====================================================================== 4) Solution The vulnerability has been fixed in version 4.27 BETA. ====================================================================== 5) Time Table 05/09/2005 - Initial vendor notification. 05/09/2005 - Initial vendor reply. 21/09/2005 - Vendor released fixed version. 23/09/2005 - Public disclosure. ====================================================================== 6) Credits Discovered by Tan Chew Keong, Secunia Research. ====================================================================== 7) References No references available. ====================================================================== 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/2005-45/advisory/ Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/ ======================================================================