====================================================================== Secunia Research 27/07/2006 - Mozilla Firefox XPCOM Event Handling Memory Corruption - ====================================================================== Table of Contents Affected Software....................................................1 Severity.............................................................2 Vendor's Description of Software.....................................3 Description of Vulnerability.........................................4 Solution.............................................................5 Time Table...........................................................6 Credits..............................................................7 References...........................................................8 About Secunia........................................................9 Verification........................................................10 ====================================================================== 1) Affected Software Mozilla Firefox 1.5.0.1, 1.5.0.2, 1.5.0.3, and 1.5.0.4. NOTE: Other versions may also be affected. ====================================================================== 2) Severity Rating: Highly critical Impact: System access Where: Remote ====================================================================== 3) Vendor's Description of Software "The award-winning, free Web browser is better than ever. Browse the Web with confidence - Firefox protects you from viruses, spyware and pop-ups. Enjoy improvements to performance, ease of use and privacy. It's easy to import your favorites and settings and get started." Product Link: http://www.mozilla.com/firefox/ ====================================================================== 4) Description of Vulnerability Secunia Research has discovered a vulnerability in Mozilla Firefox, which can be exploited by malicious people to compromise a vulnerable system. The vulnerability is caused due to an memory corruption error within the handling of simultaneously happening XPCOM events resulting in the use of a deleted timer object. Successful exploitation allows execution of arbitrary code. ====================================================================== 5) Solution Update to version 1.5.0.5. ====================================================================== 6) Time Table 22/06/2006 - Vendor notified. 23/06/2006 - Vendor response. 27/07/2006 - Public disclosure. ====================================================================== 7) Credits Discovered by Carsten Eiram, Secunia Research. ====================================================================== 8) References Mozilla.org: http://www.mozilla.org/security/announce/2006/mfsa2006-46.html The Common Vulnerabilities and Exposures (CVE) project has assigned CVE-2006-3113 for the vulnerability. ====================================================================== 9) 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/ ====================================================================== 10) Verification Please verify this advisory by visiting the Secunia website: http://secunia.com/secunia_research/2006-53/ Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/ ======================================================================