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Mozilla Foundation Security Advisory 2013-80

Title: NativeKey continues handling key messages after widget is destroyed
Impact: Moderate
Announced: September 17, 2013
Reporter: Masayuki Nakano
Products: Firefox, Seamonkey

Fixed in: Firefox 24.0
  Thunderbird 24.0
  Seamonkey 2.21


Mozilla developer Masayuki Nakano discovered that the NativeKey widget continues handling key messages even when it is destroyed by dispatched event listeners. This could result in some key events being applied to other objects or plugins if the widget memory is reallocated to them, leading to a non-exploitable crash.

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.