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Mozilla Foundation Security Advisory 2013-98

Title: Use-after-free when updating offline cache
Impact: Critical
Announced: October 29, 2013
Reporter: Byoungyoung Lee
Products: Firefox, Thunderbird, Seamonkey

Fixed in: Firefox 25.0
  Firefox ESR 24.1
  Firefox ESR 17.0.10
  Thunderbird 24.1
  Thunderbird ESR 17.0.10
  Seamonkey 2.22


Security researcher Byoungyoung Lee of Georgia Tech Information Security Center (GTISC) used the Address Sanitizer tool to discover a use-after-free during state change events while updating the offline cache. This leads to a potentially exploitable crash.

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