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Mozilla Foundation Security Advisory 2013-79

Title: Use-after-free in Animation Manager during stylesheet cloning
Impact: Critical
Announced: September 17, 2013
Reporter: Abhishek Arya
Products: Firefox, Thunderbird, Seamonkey

Fixed in: Firefox 24.0
  Firefox ESR 17.0.9
  Thunderbird 24.0
  Thunderbird ESR 17.0.9
  Seamonkey 2.21


Security researcher Abhishek Arya (Inferno) of the Google Chrome Security Team used the Address Sanitizer tool to discover a use-after-free problem in the Animation Manager during the cloning of stylesheets. This can lead to a potentially 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.