Vulnerability Note VU#866300

Mozilla Firefox designMode deleted object reference

Overview

Mozilla Firefox contains a deleted object reference vulnerability. This may allow a remote attacker to execute arbitrary code.

I. Description

Mozilla Firefox contains a vulnerability that causes a deleted object to be referenced when designMode is set to "on." When Firefox attempts to use this deleted object, the browser can crash. It may be possible to execute arbitrary code by using references to deleted objects.

II. Impact

A remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the user running Firefox.

III. Solution

Apply an update

Update to Firefox 1.5.0.3, as specified in Mozilla Foundation Security Advisory 2006-30.

Disable scripting

This vulnerability can be mitigated by disabling JavaScript.

Systems Affected

Vendor	Status	Date Updated
Mozilla, Inc.	Vulnerable	2-May-2006
Red Hat, Inc.	Not Vulnerable	18-May-2006

References

http://www.mozilla.org/security/announce/2006/mfsa2006-30.html
https://bugzilla.mozilla.org/show_bug.cgi?id=334515
http://www.securident.com/vuln/ff.txt
http://secunia.com/advisories/19802/
http://www.securityfocus.com/bid/17671
http://securitytracker.com/id?1015981

Credit

This vulnerability was publicly disclosed by splices. Mozilla also credits Martijn Wargers and Nick Mott.

This document was written by Will Dormann.

Other Information

Date Public	04/24/2006
Date First Published	05/02/2006 03:51:20 PM
Date Last Updated	05/18/2006
CERT Advisory
CVE-ID(s)	CVE-2006-1993
NVD-ID(s)	CVE-2006-1993
US-CERT Technical Alerts
Metric	7.87
Document Revision	16

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Produced 2006 by US-CERT, a government organization
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