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             AUSCERT External Security Bulletin Redistribution

                    ESB-2007.0404 -- [Win][UNIX/Linux]
     Mozilla Firefox allows cross-domain iframe access via JavaScript
                               12 June 2007

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Firefox 2.0.0.4 and prior
Publisher:            US-CERT
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact:               Cross-site Scripting
                      Access Privileged Data
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-3089

Original Bulletin:    http://www.kb.cert.org/vuls/id/143297
                      http://marc.info/?l=bugtraq&m=118097185402772&w=2

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US-CERT Vulnerability Note VU#143297
Mozilla Firefox allows cross-domain iframe access via JavaScript

Overview

	Mozilla Firefox allows cross-domain access to an iframe. This
	vulnerability could allow an attacker to interact with a web site in
	a different domain. The attacker could read content and cookies,
	capture keystrokes, and modify content.

I. Description
	
	An iframe is an HTML element which allows an HTML document to be
	embedded inside a master HTML document.

	The Mozilla same origin policy says:

	   The same origin policy prevents document or script loaded from
	   one origin from getting or setting properties of a document
	   from a different origin. The policy dates from Netscape Navigator 2.0.

	   Mozilla considers two pages to have the same origin if the
	   protocol, port (if given), and host are the same for both pages.

	Firefox does not properly enforce the same origin policy to web pages
	that use IFrames.

	From Mozilla Bugzilla Bug ID 382686:

	   The problem you fixed there is that document.write() could be
	   used to overwrite frames that originate from Internet-based
	   SRC= pointing to non-same-domain site. This is fixed and throws
	   a security exception.

	   Unfortunately, the check implemented means that about:blank
	   frames can be overwritten freely; and unfortunately, *all*
	   frames, even with Internet SRC= specified, will be vulnerable
	   to a race condition while the document loads.

	Note that some websites that allow users to supply content may allow
	iframes to be included.

II. Impact

	An attacker may be able to obtain sensitive data from a user, modify
	the appearance of a webpage or track keystrokes. Depending on the
	nature of the web site the user was visiting, this data may include
	passwords, credit card numbers, and any arbitrary information provided
	by the user.

III. Solution

	We are currently unaware of a practical solution to this problem.

	Workarounds for users

	    * Disable JavaScript
	    * Use the NoScript Firefox Add-on to whitelist what sites can run
	      JavaScript. https://addons.mozilla.org/en-US/firefox/addon/722
	    * Type in URLs directly in the web browser's address bar, or use
	      bookmarks to navigate to websites
	    * See the Cross-Site Scripting Vulnerabilities document for general
	      information. http://www.cert.org/archive/pdf/cross_site_scripting.pdf

	Workarounds for administrators

	    * Do not allow user submitted content to include JavaScript.
	    * Do not allow users to submit content to a shared resource that
	      includes iframes. A shared resource may include the comments
	      section of a blog or a web forum.
	    * Monitor the content submitted by third parties for malicious
	      JavaScript or iframes.

Systems Affected

	Vendor   Status      Date Updated
	Mozilla  Vulnerable  8-Jun-2007

References

	http://archives.neohapsis.com/archives/fulldisclosure/2007-06/0026.html
	https://bugzilla.mozilla.org/show_bug.cgi?id=382686
	http://www.w3schools.com/tags/tag_iframe.asp
	http://www.w3.org/TR/html401/present/frames.html#h-16.5
	https://addons.mozilla.org/en-US/firefox/addon/722
	http://www.mozilla.org/projects/security/components/same-origin.html
	http://www.cert.org/archive/pdf/cross_site_scripting.pdf
	http://www.stopbadware.org/home/security#preventing
	http://www.antiphishing.org/consumer_recs.html

Credit

	This vulnerability was reported by Michal Zalewski on the
	Full-Disclosure mailing list.

	This document was written by Ryan Giobbi.

Other Information

	Date Public	06/04/2007
	Date First Published	06/08/2007 01:28:14 PM
	Date Last Updated	06/11/2007
	CERT Advisory	 
	CVE Name	 
	Metric	8.51
	Document Revision	22

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