Vulnerability Note VU#488774

Mozilla XBL binding vulnerability

Original Release date: 17 Apr 2006 | Last revised: 17 May 2006


Mozilla products fail to properly restrict access to privileged XBL bindings. This vulnerability may allow a remote, unauthenticated attacker to execute arbitrary code.



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.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.


A remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system.


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 (Learn More)

VendorStatusDate NotifiedDate Updated
Mozilla, Inc.Affected-17 Apr 2006
Red Hat, Inc.Affected-17 May 2006
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



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

  • CVE IDs: CVE-2006-1733
  • Date Public: 13 Apr 2006
  • Date First Published: 17 Apr 2006
  • Date Last Updated: 17 May 2006
  • Severity Metric: 26.44
  • Document Revision: 20


If you have feedback, comments, or additional information about this vulnerability, please send us email.