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Mozilla Foundation Security Advisory 2013-81

Title: Use-after-free with select element
Impact: Critical
Announced: September 17, 2013
Reporter: Scott Bell
Products: Firefox, Seamonkey

Fixed in: Firefox 24.0
  Thunderbird 24.0
  Seamonkey 2.21


Security researcher Scott Bell used the Address Sanitizer tool to discover a use-after-free when using a <select> element in a form after it has been destroyed. This could 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.