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Mozilla Foundation Security Advisory 2011-06

Use-after-free error using Web Workers

Announced
March 1, 2011
Reporter
Daniel Kozlowski
Impact
Critical
Products
Firefox, SeaMonkey
Fixed in
  • Firefox 3.5.17
  • Firefox 3.6.14
  • SeaMonkey 2.0.12

Description

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.

References