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Vulnerability Note VU#488774

Mozilla XBL binding vulnerability

Overview

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

I. Description

XBL

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

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

III. Solution

Upgrade

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

VendorStatusDate Updated
Mozilla, Inc.Vulnerable17-Apr-2006
Red Hat, Inc.Vulnerable17-May-2006

References


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

Date Public04/13/2006
Date First Published04/17/2006 10:33:19 AM
Date Last Updated05/17/2006
CERT Advisory 
CVE NameCVE-2006-1733
US-CERT Technical Alerts 
Metric26.44
Document Revision20

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