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AL-2004.041 -- Window Injection Vulnerability in Multiple Web Browsers

Date: 09 December 2004
References: ESB-2005.0134  AA-2005.006  

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===========================================================================
A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2004.041 -- AUSCERT ALERT
          Window Injection Vulnerability in Multiple Web Browsers
                              9 December 2004

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

        AusCERT Alert Summary
        ---------------------

Product:           Microsoft Internet Explorer
                   Mozilla
                   Firefox
                   Opera
                   Safari
                   Konqueror
Operating System:  Windows
                   Linux variants
                   UNIX variants
                   Mac OS
Impact:            Provide Misleading Information
                   Access Privileged Data
Access:            Remote/Unauthenticated

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PROBLEM:  

	A vulnerability in multiple web browsers allows an attacker to make 
	spoofed web page content appear to come from a trusted site.

	If a trusted web site is visited while a page from a malicious web site 
	is still open in another window, then any named popup window provided 
	by the trusted site can be overwritten with content of the attacker's 
	choice. 

	Secunia has constructed a demonstration of this vulnerability. [1]	


PRODUCTS:

	This attack is effective against the following web browser versions, 
	as well as all prior versions:

	Microsoft Internet Explorer 6.0
	Mozilla 1.7.3
	Mozilla Firefox 1.0
	Opera 7.54
	Safari 1.2.4
	Konqueror 3.2.2

	Other browsers may be vulnerable, however this has not yet been 
	confirmed.


IMPACT:

	When a window is opened by clicking a link on a trusted web site, a 
	user is likely to believe that the content can be trusted. 

	Since an attacker can overwrite the contents of this window, they may
	convince a user to provide a password or other sensitive information
	to the attacker, instead of to the trusted site.

	This is of particular concern for accessing secure sites which 
	routinely open a new window for user logon with no location bar, since 
	the attacker can overwrite the real logon window with a fake logon 
	window.

	AusCERT advises that proof of concept code has been published for this 
	vulnerability. It is anticipated that the vulnerability may be used in 
	conjunction with fake emails appearing to come from financial 
	institutions in order to facilitate financial fraud.


MITIGATION: 

	No updates are currently available to address this vulnerability.

	Before visiting a trusted web site, first shut down the web browser by 
	closing all browser windows. 

	It is advisable to not click on any links provided in email messages.
	If a user wishes to follow a link in an email it is best to type the
	address into the web browser by hand.


REFERENCES:

	[1] Secunia proof of concept demonstration
	    http://secunia.com/multiple_browsers_window_injection_vulnerability_test/

	[2] Original Secunia Research advisory
	    http://secunia.com/secunia_research/2004-13/advisory/


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This security bulletin is provided as a service to AusCERT's members.  As
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        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

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