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Mozilla Foundation Security Advisory 2010-27

Title: Use-after-free error in nsCycleCollector::MarkRoots()
Impact: Critical
Announced: June 22, 2010
Reporter: wushi
Products: Firefox, SeaMonkey

Fixed in: Firefox 3.5.10
  SeaMonkey 2.0.5


Security researcher wushi of team509 reported that the frame construction process for certain types of menus could result in a menu containing a pointer to a previously freed menu item. During the cycle collection process, this freed item could be accessed, resulting in the execution of a section of code potentially controlled by an attacker.