The nsXBLProtoImpl::InstallImplementation function in Mozilla Firefox
before 29.0, Firefox ESR 24.x before 24.5, Thunderbird before 24.5,
and SeaMonkey before 2.26 does not properly check whether objects are
XBL objects, which allows remote attackers to execute arbitrary code
code that accesses a non-XBL object as if it were an XBL object.
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