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Mozilla Foundation Security Advisory 2012-63

SVG buffer overflow and use-after-free issues

August 28, 2012
Arthur Gerkis
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


Security researcher Arthur Gerkis used the Address Sanitizer tool to find two issues involving Scalable Vector Graphics (SVG) files. The first issue is a buffer overflow in Gecko's SVG filter code when the sum of two values is too large to be stored as a signed 32-bit integer, causing the function to write past the end of an array. The second issue is a use-after-free when an element with a "requiredFeatures" attribute is moved between documents. In that situation, the internal representation of the "requiredFeatures" value could be freed prematurely. Both issues are potentially exploitable.