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Mozilla Foundation Security Advisory 2011-06

Title: Use-after-free error using Web Workers
Impact: Critical
Announced: March 1, 2011
Reporter: Daniel Kozlowski
Products: Firefox, SeaMonkey

Fixed in: Firefox 3.6.14
  Firefox 3.5.17
  SeaMonkey 2.0.12


Daniel Kozlowski reported that a JavaScript Worker could be used to keep a reference to an object that could be freed during garbage collection. Subsequent calls through this deleted reference could cause attacker-controlled memory to be executed on a victim's computer.