[NT] DoS in Multiple IE Versions (Self-Referenced Directives)

From: support@securiteam.com
Date: 04/20/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Sat, 20 Apr 2002 19:07:31 +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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  DoS in Multiple IE Versions (Self-Referenced Directives)
------------------------------------------------------------------------

SUMMARY

OBJECT elements are used for embedded OLE in HTML documents. A flaw in the
way Microsoft Internet Explorer processes this directive allows a page
that causes a loop in object dependency, or loads itself in a certain
manner in an OBJECT, to completely crash Internet Explorer.

DETAILS

Exploit:
To date, there have been discovered 4 points of exploitation to crash the
browser. Here is one example:

Creating a file called crash.htm with the following content: 

----
<0BJECT DATA="CRASH.HTM" TYPE="text/html"></OBJECT>
----
(NOTE: The O letter has been replaced with a 0)

Internet Explorer dies inside shdocvw.dll with a call stack overflow. 

Workaround:
Set "Run ActiveX Controls and Plugins" to disabled in ALL zones.

ADDITIONAL INFORMATION

The information has been provided by  <mailto:mattmurphy@kc.rr.com> 
Matthew Murphy.

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DISCLAIMER: 
The information in this bulletin is provided "AS IS" without warranty of any kind. 
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.

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