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Mozilla Foundation Security Advisory 2012-61

Memory corruption with bitmap format images with negative height

Announced
August 28, 2012
Reporter
Frédéric Hoguin
Impact
Critical
Products
Firefox, Firefox ESR, SeaMonkey, Thunderbird, Thunderbird ESR
Fixed in
  • Firefox 15
  • Firefox ESR 10.0.7
  • SeaMonkey 2.12
  • Thunderbird 15
  • Thunderbird ESR 10.0.7

Description

Security researcher Frédéric Hoguin reported two related issues with the decoding of bitmap (.BMP) format images embedded in icon (.ICO) format files. When processing a negative "height" header value for the bitmap image, a memory corruption can be induced, allowing an attacker to write random memory and cause a crash. This crash may be potentially exploitable.

References