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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0381 -- [Win]
          Microsoft Internet Explorer cross-domain vulnerability
                                6 June 2007

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

Product:              Microsoft Internet Explorer 6 and 7
Publisher:            US-CERT
Operating System:     Windows
Impact:               Access Privileged Data
                      Cross-site Scripting
Access:               Remote/Unauthenticated

Original Bulletin:    
  http://www.kb.cert.org/vuls/id/471361
  http://marc.info/?l=bugtraq&m=118097185402772&w=2

Comment: Note that this race vulnerability is reported also to allow
         memory corruption, as per the original Bugtraq post linked above.
         Whether this may allow an attacker to execute arbitrary code
         has not yet been confirmed.

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US-CERT Vulnerability Note VU#471361
Microsoft Internet Explorer cross-domain vulnerability

Overview

	Microsoft Internet Explorer contains a race condition that results
	in a cross-domain violation.

I. Description

	Internet Explorer uses a cross-domain security model to maintain
	separation between browser frames from different sources. This model
	is designed to prevent code in one domain from accessing data in a
	different domain. The Internet Security Manager Object determines
	which zone or domain a URL exists in and what actions can be performed.

	A race condition in Internet Explorer may allow an attacker to evade
	the cross-domain security model. Note that Internet Explorer 6 and
	Internet Explorer 7 are affected by this vulnerability.

II. Impact
	
	A website in one domain has the ability to access information in
	another domain. The website may also be able to execute scripts or
	take other actions that are permitted in the other domain.

III. Solution

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

	Do not follow unsolicited links

	In order to convince users to visit their sites, attackers often use
	URL encoding, IP address variations, long URLs, intentional
	misspellings, and other techniques to create misleading links. Use
	caution when clicking on unsolicited links received in email, instant
	messages, web forums, or internet relay chat (IRC) channels. Type
	URLs directly into the browser to avoid these misleading links. While
	these are generally good security practices, following these behaviors
	will not prevent exploitation of this vulnerability in all cases.

	Disable Javascript

	Disabling Javascript may mitigate this vulnerability. Instructions
	for disabling javascript can be found in the Securing Your Web Browser
	document. http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer

Systems Affected

	Vendor                 Status      Date Updated
	Microsoft Corporation  Vulnerable  5-Jun-2007

References

	http://archives.neohapsis.com/archives/fulldisclosure/2007-06/0026.html
	http://msdn2.microsoft.com/en-us/library/ms537183.aspx
	http://msdn2.microsoft.com/en-us/library/ms537186.aspx
	http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
	http://www.antiphishing.org/consumer_recs.html

Credit

	This issue 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	06/05/2007 09:24:29 AM
	Date Last Updated	06/05/2007
	CERT Advisory	 
	CVE Name	 
	Metric	0.00
	Document Revision	12

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===========================================================================
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