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Vulnerability Note VU#687396

Mozilla products fail to properly validate JavaScript constructors

Overview

Mozilla products fail to properly validate references returned by JavaScript constructors. This vulnerability may allow a remote attacker to execute arbitrary code on a vulnerable system.

I. Description

According to Mozilla Foundation Security Advisory 2006-51:

    JavaScript functions have a parent object created using the standard Object() constructor (ECMA-specified behavior) and that this constructor can be redefined by script (also ECMA-specified behavior). If the Object() constructor is changed to return a reference to a privileged object with useful properties it is possible to have attacker-supplied script executed with elevated privileges by calling the function. This could be used to install malware or take other malicious actions.

For more information and a complete list of affected products, refer to Mozilla Foundation Security Advisory 2006-51.

II. Impact

A remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. The attacker could also cause the vulnerable application to crash.

III. Solution

Apply an update


This vulnerability is addressed in Firefox 1.5.0.5, Thunderbird 1.5.0.5, and SeaMonkey 1.0.3, according to the Mozilla Foundation Security Update 2006-51.

Disable JavaScript

This vulnerability can be mitigated by disabling JavaScript.

Systems Affected

VendorStatusDate Updated
Mozilla, Inc.Vulnerable27-Jul-2006

References


http://www.mozilla.org/security/announce/2006/mfsa2006-51.html
https://bugzilla.mozilla.org/show_bug.cgi?id=340727
http://secunia.com/advisories/19873/
http://secunia.com/advisories/21216/
http://www.securityfocus.com/bid/19181

Credit

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-48. Mozilla credits moz_bug_r_a4 with reporting this vulnerability.

This document was written by Jeff Gennari.

Other Information

Date Public07/25/2006
Date First Published07/27/2006 11:52:50 AM
Date Last Updated02/09/2007
CERT Advisory 
CVE-ID(s)CVE-2006-3807
NVD-ID(s)CVE-2006-3807
US-CERT Technical Alerts 
Metric16.03
Document Revision11

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