====================================================================== Secunia Research 12/06/2009 - Mozilla Firefox Java Applet Loading Vulnerability - ====================================================================== 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 * Firefox 3.0.7, 3.0.8, and 3.0.9 for Windows with JRE 6 Update 13 NOTE: Other versions may also be affected. ====================================================================== 2) Severity Rating: Highly critical Impact: System compromise Where: Remote ====================================================================== 3) Vendor's Description of Software "The award-winning Firefox Web browser has security, speed and new features that will change the way you use the Web. Don’t settle for anything less.". Product Link: http://www.mozilla.com/firefox/ ====================================================================== 4) Description of Vulnerability Secunia Research has discovered a vulnerability in Firefox, which can be exploited by malicious people to potentially compromise a user's system. The vulnerability is caused due to a race condition when accessing the private data of an NPObject JS wrapper class object if navigating away from a web page while loading a Java applet. This can be exploited via a specially crafted web page to use already freed memory. Successful exploitation may allow execution of arbitrary code. ====================================================================== 5) Solution Update to version 3.0.11. ====================================================================== 6) Time Table 26/03/2009 - Vendor notified. 01/04/2009 - Vendor notified (2nd attempt). 01/04/2009 - Vendor response. 12/06/2009 - Public disclosure. ====================================================================== 7) Credits Discovered by Jakob Balle and Carsten Eiram, Secunia Research. ====================================================================== 8) References The Common Vulnerabilities and Exposures (CVE) project has assigned CVE-2009-1837 for the vulnerability. ====================================================================== 9) About Secunia Secunia offers vulnerability management solutions to corporate customers with verified and reliable vulnerability intelligence relevant to their specific system configuration: http://secunia.com/advisories/business_solutions/ Secunia also provides a publicly accessible and comprehensive advisory database as a service to the security community and private individuals, who are interested in or concerned about IT-security. http://secunia.com/advisories/ Secunia believes that it is important to support the community and to do active vulnerability research in order to aid improving the security and reliability of software in general: http://secunia.com/secunia_research/ Secunia regularly hires new skilled team members. Check the URL below to see currently vacant positions: http://secunia.com/corporate/jobs/ Secunia offers a FREE mailing list called Secunia Security Advisories: http://secunia.com/advisories/mailing_lists/ ====================================================================== 10) Verification Please verify this advisory by visiting the Secunia website: http://secunia.com/secunia_research/2009-19/ Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/ ======================================================================