full-disclosure - DoS - Microsoft Internet Explorer 6.0 SP1 OBJECT tag bug

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From: rde at ins-business.com (Ryan Emerle)
Subject: DoS - Microsoft Internet Explorer 6.0 SP1 OBJECT tag bug

Hi,

I have uncovered a bug in IE:

*Description*
Microsoft Internet Explorer 6.0 (other versions not tested) is vulnerable 
to a DoS when specially crafted html is present on a page.  The 
vulnerability is in the processing of the OBJECT tag where the data attribute
points to the same page as object tag.  This causes IE's stack to overflow.

*Tested*
OS: Windows 2000 Pro SP3 (fully up-to-date)
OS: Windows XP Pro SP1 (fully up-to-date)
IE: Internet Explorer 6.0.2800.1106 SP1

*Ramifications*
When the specially crafted HTML is present in a page, Internet Explorer 
will forcefully terminate all open sessions.  The client machine is 
otherwise unharmed. Further ramifications have not been investigated.

*Proof of Concept*
The following HTML code will cause the above version of Internet Explorer 
to forcefully terminate:

<object id="test"
       data="#"
       width="100%" height="100%" 
       type="text/x-scriptlet" 
       VIEWASTEXT></object>

--
Ryan Emerle, BSCS
Lead Systems Developer
Interactive Network Systems, Inc.
http://www.ins-business.com