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Mozilla Foundation Security Advisory 2013-96

Improperly initialized memory and overflows in some JavaScript functions

October 29, 2013
Dan Gohman
Firefox, Firefox ESR, SeaMonkey, Thunderbird, Thunderbird ESR
Fixed in
  • Firefox 25
  • Firefox ESR 17.0.10
  • Firefox ESR 24.1
  • SeaMonkey 2.22
  • Thunderbird 24.1
  • Thunderbird ESR 17.0.10


Compiler Engineer Dan Gohman of Google discovered a flaw in the JavaScript engine where memory was being incorrectly allocated for some functions and the calls for allocations were not always properly checked for overflow, leading to potential buffer overflows. When combined with other vulnerabilities, these flaws could be potentially exploitable.

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