-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

- --------------------------BEGIN INCLUDED TEXT--------------------

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/


- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        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.
===========================================================================

-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQCVAwUBQbflUyh9+71yA2DNAQIeNwQAnrxrqO3bdS4VWWOBlccldIXIE5/qq3oY
tBQJJGPtph9H0OIIc3oMlb722XdMAN8Ia5XUfcgvNaH04wB7kba8svR6JYX7Mkgj
dxZxPsFSRnucpYCzhtJ4HJz8hN8tjjmWN0FRmjKGjUSxzFjx+LISpg8g+lAtwyUr
pyJ2GuMHEl0=
=8jAi
-----END PGP SIGNATURE-----