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Mozilla Firefox fails to properly handle the "XPCNativeWrapper(window).Function(...)"

Vulnerability Note VU#911004

Original Release Date: 2006-08-01 | Last Revised: 2007-02-09


Certain Mozilla products contain a cross-site scripting vulnerability because of a vulnerability in the XPCNativeWrapper function.



Per Mozilla, XPCNativeWrapper is a way to wrap up an object so that it is safe to access from privileged code. It is used to allow chrome code to access DOM objects.

The Problem

An attacker can use the XPCNativeWrapper function to inject script into a browser window that may be in a different domain. This violates the Netscape same-origin policy.


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.


This issue is addressed in the updates to Mozilla Firefox and Thunderbird, and the 1.0.3 version of Seamonkey. Refer to Mozilla Foundation Security Advisory 2006-54 for more details.

Disable JavaScript

For instructions on how to disable JavaScript in Firefox, please refer to the Firefox section of the Securing Your Web Browser document. JavaScript is not enabled by default in Mozilla Thunderbird.

Vendor Information


Mozilla, Inc. Affected

Updated:  August 01, 2006



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Refer to Mozilla Foundation Security Advisory 2006-54 for more details on this vulnerability.

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

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Thanks to Mozilla for reporting this vulnerability. Mozilla in turn thanks shutdown.

This document was written by Ryan Giobbi.

Other Information

CVE IDs: CVE-2006-3810
Severity Metric: 2.74
Date Public: 2006-07-25
Date First Published: 2006-08-01
Date Last Updated: 2007-02-09 14:04 UTC
Document Revision: 15

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