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Mozilla Foundation Security Advisory 2013-92

Title: GC hazard with default compartments and frame chain restoration
Impact: Critical
Announced: September 17, 2013
Reporter: Nils, Bobby Holley
Products: Firefox, Thunderbird, Seamonkey

Fixed in: Firefox 24.0
  Thunderbird 24.0
  Seamonkey 2.21


Security researcher Nils reported a potentially exploitable use-after-free in an early test version of Firefox 25. Mozilla developer Bobby Holley found that the cause was an older garbage collection bug that a more recent change made easier to trigger.

In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts.