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Mozilla Foundation Security Advisory 2011-51

Cross-origin image theft on Mac with integrated Intel GPU

November 8, 2011
Claus Wahlers
Firefox, SeaMonkey, Thunderbird
Fixed in
  • Firefox 8
  • SeaMonkey 2.5
  • Thunderbird 8


Claus Wahlers reported that random images from GPU memory were showing up in WebGL textures. Once incorporated into the WebGL graphics it is possible for a site to programatically read the image data and potentially gain sensitive data from other things that had been displayed earlier. This problem is due to a bug in the driver for Intel integrated GPUs on recent Mac OS X hardware, and the problem can be seen in WebGL implementations from other vendors. Mozilla has implemented a work-around to prevent this from happening with this hardware-driver combination.