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Mozilla Foundation Security Advisory 2009-57
Title: Chrome privilege escalation in XPCVariant::VariantDataToJS()
Impact: Critical
Announced: October 27, 2009
Reporter: moz_bug_r_a4
Products: Firefox
Fixed in: Firefox 3.5.4
Firefox 3.0.15
Description
Mozilla security researcher moz_bug_r_a4 reported
that the XPCOM utility XPCVariant::VariantDataToJS
unwrapped doubly-wrapped objects before returning them to chrome
callers. This could result in chrome privileged code calling methods
on an object which had previously been created or modified by web
content, potentially executing malicious JavaScript code with chrome
privileges.
Workaround
Disable JavaScript until a version containing these fixes can be installed.