Firefox cross-domain image theft (CESA-2008-009)

["Chris Evans" <scarybeasts () gmail com>]

Hi,

Firefox 2.0.0.18 fixes a cross-domain theft of image data. Firefox 3
unaffected. It's another interesting case where a redirector confuses the
browser about the true origin of a piece of content. If evil.org hosts a
redirector, e.g. evil.org/redir, and an image is loaded via this redirector,
the image will be treated as a same-domain image. In this event, the image
pixel data may easily be stolen by rendering the image to a canvas and using
the getImageData() JavaScript API.

Advisory: http://scary.beasts.org/security/CESA-2008-009.html

Blog post:
http://scarybeastsecurity.blogspot.com/2008/11/firefox-cross-domain-image-theft-and.html

Cheers
Chris

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