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.
Vulmon