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Mozilla Foundation Security Advisory 2013-108

Use-after-free in event listeners

December 10, 2013
Tyson Smith, Jesse Schwartzentruber
Firefox, Firefox ESR, SeaMonkey, Thunderbird
Fixed in
  • Firefox 26
  • Firefox ESR 24.2
  • SeaMonkey 2.23
  • Thunderbird 24.2


Security researchers Tyson Smith and Jesse Schwartzentruber of the BlackBerry Security Automated Analysis Team used the Address Sanitizer tool while fuzzing to discover a user-after-free when interacting with event listeners from the mListeners array. This leads to a potentially exploitable crash.

In general these flaws cannot be exploited through email in the Thunderbird and Seamonkey products because scripting is disabled, but are potentially a risk in browser or browser-like contexts.