[NT] IE CSS Parsing Error (cssText)

From: support@securiteam.com
Date: 06/17/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 17 Jun 2002 21:44:36 +0200 (CEST)

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  IE CSS Parsing Error (cssText)
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SUMMARY

A security vulnerability in Internet Explorer allows attackers to cause a
denial of service attack against the user's web browser (and programs that
use Internet Explorer to view web based content). The vulnerability occurs
whenever IE tries to parse a simple cascade style *** tag property.

DETAILS

Vulnerable systems:
 * Internet Explorer version 5
 * Internet Explorer version 5.5
 * Internet Explorer version 6.0
 * Outlook Express

Immune systems:
 * Internet Explorer version 5.1.4 for MacOS X

Exploit:
Adding the following tag:
<style>p{cssText: font-we!ght: bold;}</style>
(Note, the letter 'i' has been replaced with an '!')

To any HTML page will cause the browser to instantly crash upon its
viewing.

Demonstration:
 <http://www.bugtraq.ru/rsn/archive/2002/06/.keep/.msiecrash.html>
http://www.bugtraq.ru/rsn/archive/2002/06/.keep/.msiecrash.html

ADDITIONAL INFORMATION

The information has been provided by <mailto:dl@bugtraq.ru> Dmitry
Leonov, <mailto:patpro@patpro.net> patpro and Oleg A. Cheremisin.

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