The nsDocument::MaybePreLoadImage function in content/base/src/nsDocument.cpp
in the image-preloading implementation in Mozilla Firefox 3.6 before 3.6.2
does not apply scheme restrictions and policy restrictions to the image's URL,
which might allow remote attackers to cause a denial of service (application
crash or hang) or hijack the functionality of the browser's add-ons via a
crafted SRC attribute of an IMG element, as demonstrated by remote command
execution through an ssh: URL in a configuration that supports gnome-vfs with
a nonstandard network.gnomevfs.supported-protocols setting.