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Internet Security Systems Security Brief
December 19, 2003

Microsoft Internet Explorer URL Spoofing Vulnerability

Synopsis:

A vulnerability has been reported which poses a significant risk to
individuals who use Internet Explorer to navigate the Web. A flaw exists
in Internet Explorer which may allow Web site addresses or URLs to display
incorrectly in the Internet Explorer navigation bar, thereby allowing
scams that trick users into trusting a bogus Web site. This flaw is
trivial to exploit, and may be triggered when individuals navigate to URLs
from within emails or hostile Web pages.

Impact:

Similar vulnerabilities have been used extensively in mass-email, or fake
Web sites designed to replicate the original in an effort to steal
personal information from the victim. This type of attack has commonly
been referred to as "phishing". Whereas past phishing attacks used URLs
similar to the original, this new vulnerability allows URLs that are
identical to the original Web site. This makes it almost impossible for
individuals to differentiate between fraudulent sites and legitimate
sites.

Affected Versions:

Microsoft Internet Explorer 6.0
Microsoft Internet Explorer 5.5
Microsoft Internet Explorer 5.01

For the complete ISS X-Force Security Alert, please visit: 
http://xforce.iss.net/xforce/alerts/id/159

______ 

About Internet Security Systems (ISS) 
Founded in 1994, Internet Security Systems (ISS) (Nasdaq: ISSX) is a 
pioneer and world leader in software and services that protect critical 
online resources from an ever-changing spectrum of threats and misuse. 
Internet Security Systems is headquartered in Atlanta, GA, with 
additional operations throughout the Americas, Asia, Australia, Europe 
and the Middle East. 

Copyright (c) 2003 Internet Security Systems, Inc. All rights reserved 
worldwide. 

Permission is hereby granted for the electronic redistribution of this 
document. It is not to be edited or altered in any way without the 
express written consent of the Internet Security Systems X-Force. If you 
wish to reprint the whole or any part of this document in any other 
medium excluding electronic media, please email [EMAIL PROTECTED] for 
permission. 

Disclaimer: The information within this paper may change without notice. 
Use of this information constitutes acceptance for use in an AS IS 
condition. There are NO warranties, implied or otherwise, with regard to 
this information or its use. Any use of this information is at the 
user's risk. In no event shall the author/distributor (Internet Security 
Systems X-Force) be held liable for any damages whatsoever arising out 
of or in connection with the use or spread of this information. 
X-Force PGP Key available on MIT's PGP key server and PGP.com's key server, 
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Please send suggestions, updates, and comments to: X-Force 
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