Vulnerability Note VU#488774

Mozilla XBL binding vulnerability

According to Mozilla, XBL "is a markup language that defines special new elements, or 'bindings' for XUL widgets (and for HTML elements ...) ".

The Problem

Privileged XBL bindings may be accessible by user controlled content in a way that could allow a remote attacker to execute arbitrary code. Specifically, the valueOf.call()and valueOf.apply() routines can be leveraged by an attacker to compile and execute arbitrary code with the privileges of the attacked XBL binding.

For a list of affected products refer to Mozilla Foundation Security Advisory 2006-16.

II. Impact

Refer to Mozilla Foundation Security Advisory 2006-16 for fixed versions of Mozilla products.

Disable JavaScript

For instructions on how to disable JavaScript in Firefox, please refer to the Firefox section of the Securing Your Web Browser document.

Systems Affected

http://www.mozilla.org/security/announce/2006/mfsa2006-16.html
http://www.mozilla.org/docs/xul/xulnotes/xulnote_xbl.html#xbl
https://bugzilla.mozilla.org/show_bug.cgi?id=312871
https://bugzilla.mozilla.org/show_bug.cgi?id=313236
https://bugzilla.mozilla.org/show_bug.cgi?id=313375

Credit

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-16. Mozilla credits moz_bug_r_a4 with providing information regarding this issue.

This document was written by Jeff Gennari.

Other Information

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