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
Operating System: Windows
Impact: Provide Misleading Information
Access Privileged Data
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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
Secunia has constructed a demonstration of this vulnerability. 
This attack is effective against the following web browser versions,
as well as all prior versions:
Microsoft Internet Explorer 6.0
Mozilla Firefox 1.0
Other browsers may be vulnerable, however this has not yet been
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
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.
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.
 Secunia proof of concept demonstration
 Original Secunia Research advisory
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