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Mozilla Foundation Security Advisory 2013-78

Integer overflow in ANGLE library

September 17, 2013
Alex Chapman
Firefox, SeaMonkey
Fixed in
  • Firefox 24
  • SeaMonkey 2.21


Security researcher Alex Chapman reported that the Almost Native Graphics Layer Engine (ANGLE) library used by Mozilla is vulnerable to an integer overflow. This vulnerability is present because of insufficient bounds checking in the drawLineLoop function, which can be driven by web content to overflow allocated memory, leading to a potentially exploitable crash.

In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts.