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Mozilla Foundation Security Advisory 2010-39

nsCSSValue::Array index integer overflow

July 20, 2010
J23 (via TippingPoint's Zero Day Initiative)
Firefox, SeaMonkey, Thunderbird
Fixed in
  • Firefox 3.5.11
  • Firefox 3.6.7
  • SeaMonkey 2.0.6
  • Thunderbird 3.0.6
  • Thunderbird 3.1.1


Security researcher J23 reported via TippingPoint's Zero Day Initiative that an array class used to store CSS values contained an integer overflow vulnerability. The 16 bit integer value used in allocating the size of the array could overflow, resulting in too small a memory buffer being created. When the array was later populated with CSS values data would be written past the end of the buffer potentially resulting in the execution of attacker-controlled memory.