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Mozilla Foundation Security Advisory 2013-64

Title: Use after free mutating DOM during SetBody
Impact: Critical
Announced: August 6, 2013
Reporter: Nils
Products: Firefox, Seamonkey

Fixed in: Firefox 23.0
  Seamonkey 2.20


Security researcher Nils used the Address Sanitizer to discover a use-after-free problem when the Document Object Model is modified during a SetBody mutation event. This causes 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 in those products.