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Mozilla Foundation Security Advisory 2009-13

Title: Arbitrary code execution via XUL tree element
Impact: Critical
Announced: March 27, 2009
Reporter: Nils
Products: Firefox

Fixed in: Firefox 3.0.8

Description

Security researcher Nils reported via TippingPoint's Zero Day Initiative that the XUL tree method _moveToEdgeShift was in some cases triggering garbage collection routines on objects which were still in use. In such cases, the browser would crash when attempting to access a previously destroyed object and this crash could be used by an attacker to run arbitrary code on a victim's computer.

This vulnerability was used by the reporter to win the 2009 CanSecWest Pwn2Own contest.

This vulnerability does not affect Firefox 2, Thunderbird 2, or released versions of SeaMonkey.

References