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Vulnerability Note VU#405092

Mozilla products allows the src attribute in an img element to be changed to a JavaScript URI

Overview

Mozilla products contain a cross-site scripting vulnerability due to a vulnerability in the way IMG elements are loaded.

I. Description

A vulnerability in the way Mozilla products load IMG elements in a frame may cause a cross-site script injection. According to Mozilla Foundation Security Advisory 2006-72:

    ... the src attribute of an IMG element loaded in a frame could be changed to a javascript: URI that was able to bypass the protections against cross-site script (XSS) injection. The injected script could steal credentials and financial data, or perform destructive actions on behalf of a logged-in user.

II. Impact

By convincing a victim to view an HTML document (web page), an attacker could evaluate script in a different security domain than the one containing the attacker's document. The attacker could read or modify data in other web sites (read cookies/content, modify/create content, etc.). If the script is evaluated with chrome privileges, an attacker could execute arbitrary commands on the user's system.

III. Solution

Apply an update

According to the Mozilla Foundation Security Advisory 2006-72, this vulnerability is addressed in Firefox 2.0.0.1, Firefox 1.5.0.9, Thunderbird 1.5.0.9, and SeaMonkey 1.0.7.

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
Debian GNU/LinuxVulnerable5-Mar-2007
Fedora ProjectVulnerable18-Jan-2007
Gentoo LinuxVulnerable18-Jan-2007
Mandriva, Inc.Vulnerable18-Jan-2007
MozillaVulnerable21-Dec-2006
Red Hat, Inc.Vulnerable18-Jan-2007
rPathVulnerable18-Jan-2007
Slackware Linux Inc.Vulnerable18-Jan-2007
SUSE LinuxVulnerable18-Jan-2007
UbuntuVulnerable18-Jan-2007

References


http://www.mozilla.org/security/announce/2006/mfsa2006-72.html
https://bugzilla.mozilla.org/show_bug.cgi?id=351370
http://secunia.com/advisories/23591/
http://secunia.com/advisories/23598/
http://secunia.com/advisories/23439/
http://secunia.com/advisories/23545/
http://secunia.com/advisories/23601/
http://secunia.com/advisories/23614/
http://secunia.com/advisories/23618/
http://secunia.com/advisories/23692/
http://www.securityfocus.com/bid/21668
http://secunia.com/advisories/23988/

Credit

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-72. Mozilla credits moz_bug_r_a4 with providing information about this issue.

This document was written by Chris Taschner.

Other Information

Date Public12/19/2006
Date First Published01/18/2007 11:24:23 AM
Date Last Updated03/05/2007
CERT Advisory 
CVE-ID(s)CVE-2006-6503
NVD-ID(s)CVE-2006-6503
US-CERT Technical Alerts 
Metric10.26
Document Revision25

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