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Mozilla Foundation Security Advisory 2014-04

Title: Incorrect use of discarded images by RasterImage
Impact: Critical
Announced: February 4, 2014
Reporter: Fredrik Lönnqvist
Products: Firefox, Thunderbird, Seamonkey

Fixed in: Firefox 27
  Firefox ESR 24.3
  Thunderbird 24.3
  Seamonkey 2.24


Fredrik 'Flonka' Lönnqvist discovered an issue with image decoding in RasterImage caused by continued use of discarded images. This could allow for the writing to unowned memory and a potentially exploitable crash.

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