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Mozilla Foundation Security Advisory 2013-100

Title: Miscellaneous use-after-free issues found through ASAN fuzzing
Impact: Critical
Announced: October 29, 2013
Reporter: Nils
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 Nils used the Address Sanitizer tool while fuzzing to discover missing strong references in browsing engine leading to use-after-frees. This can lead 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.