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Mozilla Foundation Security Advisory 2012-04

Title: Child nodes from nsDOMAttribute still accessible after removal of nodes
Impact: Critical
Announced: January 31, 2012
Reporter: regenrecht
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 10.0
  Firefox 3.6.26
  Thunderbird 10.0
  Thunderbird 3.1.18
  SeaMonkey 2.7


Security researcher regenrecht reported via TippingPoint's Zero Day Initiative that removed child nodes of nsDOMAttribute can be accessed under certain circumstances because of a premature notification of AttributeChildRemoved. This use-after-free of the child nodes could possibly allow for remote code execution.