[NT] Microsoft Internet Explorer % Encoding Security Issue (CSS)

From: support@securiteam.com
Date: 09/14/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Sat, 14 Sep 2002 19:31:18 +0200 (CEST)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Microsoft Internet Explorer % Encoding Security Issue (CSS)
------------------------------------------------------------------------

SUMMARY

A security vulnerability in Internet Explorer allows attackers to cause
the product to reveal sensitive cookies of third party sites. This is
caused by inconsistent decoding of URL information, causing the domain
name that is used by the cookie domain to decode differently from that of
the actual domain name being accessed.

DETAILS

Vulnerable systems:
 * Internet Explorer version 6.0.2600.0000

%xx values in the URL are decoded when IE calculates the domain, but not
decoded while downloading a page. Therefore, if we have a URL such as:
www.yahoo.com%2F@clik.to/liudieyu">http://www.yahoo.com%2F@clik.to/liudieyu (where 2F equals to
hex$(asc('/'))), the URL will lead to clik.to/liudieyu instead of
www.yahoo.com, while the domain as seen by IE is www.yahoo.com.

Demonstration:
A demonstration is available at:
 <http://www16.brinkster.com/liudieyu/2FforMSIE/2FforMSIE-MyPage.htm>
http://www16.brinkster.com/liudieyu/2FforMSIE/2FforMSIE-MyPage.htm

Alternatively, it is also available at:
 <clik.to/liudieyu> clik.to/liudieyu (going to the 2FforMSIE-MyPage
section).

ADDITIONAL INFORMATION

The information has been provided by
<mailto:liudieyuinchina@yahoo.com.cn> Liu Die Yu.

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