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Vulnerability Note VU#842094

Mozilla JavaScript cloned parent vulnerability

Overview

Mozilla products fail to properly restrict access to a JavaScript functions cloned parent. This vulnerability may allow a remote attacker to execute arbitrary code on a vulnerable system.

I. Description

According to Mozilla Foundation Security Advisory 2006-15:

    it was possible to use the Object.watch() method to access an internal function object (the "clone parent") which could then be used to run arbitrary JavaScript code with full permission.
    In pre-release versions of Firefox 1.5 the same technique could be applied to the Array generic methods introduced in that release.

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

Refer to Mozilla Foundation Security Advisory 2006-15 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/mfsa2006-15.html
https://bugzilla.mozilla.org/show_bug.cgi?id=313370
https://bugzilla.mozilla.org/show_bug.cgi?id=313684

Credit

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-15. Mozilla credits shutdown with providing information regarding this issue.

This document was written by Jeff Gennari.

Other Information

Date Public04/13/2006
Date First Published04/17/2006 10:46:10 AM
Date Last Updated05/17/2006
CERT Advisory 
CVE NameCVE-2006-1734
US-CERT Technical Alerts 
Metric20.45
Document Revision19

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