Vulnerability Note VU#428500

Mozilla LiveConnect vulnerable to crash finalizing JS objects

Original Release date: 18 Jan 2007 | Last revised: 05 Apr 2007


A vulnerability exists in the Mozilla LiveConnect that may allow a remote attacker to cause a denial of service.


Mozilla LiveConnect, which allows communication between Java applets and web JavaScript, contains a vulnerability in the way freed objects are re-used that may result in a denial of service. According to the Mozilla Foundation Security Advisory 2006-71:

    The crash is due to re-use of an already-freed object and we presume this could be exploited with enough effort.


A remote, unathenticated attacker may be able to cause a denial of service.


Apply an update
According to the Mozilla Foundation Security Advisory 2006-71, this vulnerability is addressed in Firefox, Firefox, Thunderbird, and SeaMonkey 1.0.7.

Disable Java

For instructions on how to disable Java in Firefox, please refer to the Firefox section of the Securing Your Web Browser document.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Debian GNU/LinuxAffected-05 Apr 2007
Fedora ProjectAffected-18 Jan 2007
Gentoo LinuxAffected-18 Jan 2007
Mandriva, Inc.Affected-18 Jan 2007
MozillaAffected-21 Dec 2006
Red Hat, Inc.Affected-18 Jan 2007
rPathAffected-18 Jan 2007
Slackware Linux Inc.Affected-18 Jan 2007
SUSE LinuxAffected-18 Jan 2007
UbuntuAffected-18 Jan 2007
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



This vulnerability was reported in Mozilla Foundation Security Advisory 2006-71. Mozilla credits Steven Michaud with providing information about this issue.

This document was written by Chris Taschner.

Other Information

  • CVE IDs: CVE-2006-6502
  • Date Public: 19 Dec 2006
  • Date First Published: 18 Jan 2007
  • Date Last Updated: 05 Apr 2007
  • Severity Metric: 3.64
  • Document Revision: 25


If you have feedback, comments, or additional information about this vulnerability, please send us email.