Vulnerability Note VU#968814

Mozilla JavaScript security bypass vulnerability

Overview

Mozilla products fail to properly enforce security restrictions in JavaScript. This vulnerability may allow a remote, unauthenticated attacker to execute arbitrary code.

I. Description

According to Mozilla Foundation Security Advisory 2006-28:

The security check in js_ValueToFunctionObject() can be bypassed by clever use of setTimeout() and the new Firefox 1.5 array method ForEach. shutdown demonstrated how to leverage this into a privilege escalation vulnerability that would allow the installation of malware.

Note that JavaScript must be enabled in order for this vulnerability to exist. JavaScript is enabled by default in the Firefox and Mozilla web browsers, but not in the Mozilla's mail client or Thunderbird. Exploitation can occur by accessing a specially crafted web page with Firefox. If JavaScript is enabled within Mozilla's mail client or Thunderbird, then this issue may be exploitable by opening a specially crafted email.

II. Impact

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

III. Solution

Upgrade

This issue is fixed in Firefox 1.5.0.2, Thunderbird 1.5.0.2, and SeaMonkey 1.0.1.

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

Vendor	Status	Date Updated
Mozilla, Inc.	Vulnerable	17-Apr-2006
Red Hat, Inc.	Not Vulnerable	17-May-2006

References

http://www.mozilla.org/security/announce/2006/mfsa2006-28.html

Credit

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-28.

This document was written by Jeff Gennari.

Other Information

Date Public	04/13/2006
Date First Published	04/17/2006 09:03:19 AM
Date Last Updated	05/17/2006
CERT Advisory
CVE Name	CVE-2006-1726
US-CERT Technical Alerts
Metric	20.45
Document Revision	23

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

Produced 2006 by US-CERT, a government organization
Disclaimers and copyright information

Get Adobe Reader