Mozilla Foundation Security Advisory 2013-91
Title: User-defined properties on DOM proxies get the wrong "this" object
Announced: September 17, 2013
Reporter: Boris Zbarsky
Products: Firefox, Thunderbird, Seamonkey
Fixed in: Firefox 24.0
Firefox ESR 17.0.9
Thunderbird ESR 17.0.9
Mozilla developer Boris Zbarsky reported that user-defined
getters on DOM proxies would incorrectly get the expando object as
client or add-on code making incorrect security sensitive decisions based
on hacker supplied values.
In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts.