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Mozilla Foundation Security Advisory 2008-07
Title: Possible information disclosure in BMP decoder
Impact: Moderate
Announced: February 19, 2008
Reporter: Gynvael Coldwind // Vexillium
Products: Firefox, SeaMonkey
Fixed in: Firefox 2.0.0.12
SeaMonkey 1.1.8
Description
Security researcher Gynvael Coldwind of Vexillium
(crediting help from udevd and porneL)
demonstrated that BMP images
could be used to reveal small chunks of uninitialized memory
that might contain sensitive data from other pages or other
programs, and that this data could be extracted from the
image using methods associated with the <canvas>
feature.
Because this flaw also affected products from other vendors disclosure was delayed until they could release a fix.
Update: Thunderbird was incorrectly listed as affected by this
vulnerability. The maliciously formed BMP images would contain
noise influenced by uninitialized memory as in Firefox, but Thunderbird
lacks the <canvas> feature necessary for an attacker
to extract the data from the image.
Workaround
Disable JavaScript until a version containing these fixes can be installed.