Software Engineering Institute

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.

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

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.