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Re: MSIE flaws: nested array sort() loop Stack overflow exception

from [isno] Network Security [Permanent Link]
Subject: Re: MSIE flaws: nested array sort() loop Stack overflow exception
Date: Fri, 26 Nov 2004 11:38:06 +0800 
I don't think this flaw is exploitable.In MSIE, any loop can lead to 
exception.Just like:

<IFRAME SRC=?>

save it as a html file, open it in IE, in about 30 seconds, it will cause a 
stack_overflow exception and exit. Because IE will not stop allocating stack 
buffer, until there is not enough stack space.  

= = = = = = = = = = = = = = = = = = = =


Hi all,

Another flaw in IE:

<HTML>
 <SCRIPT> a = new Array(); while (1) { (a = new Array(a)).sort(); } </SCRIPT>
 <SCRIPT> a = new Array(); while (1) { (a = new Array(a)).sort(); } </SCRIPT>
</HTML>

Normally I would see if it's exploitable but I figure I'm not MS's pet bug 
finder/analyser... So, I've CC'ed this message to Microsoft. I'm sure they 
know their own product better then I do and can analyse the problem much 
faster. So if you want to know the impact of this vulnerability, ask them: I'm 
sure they will be more then willing to help you. I'm sure they will even reply 
to this message with technical details and a patch tomorrow.

Added to the list: http://www.edup.tudelft.nl/~bjwever/advisory_ie_flaws.html

Cheers,
SkyLined
http://www.edup.tudelft.nl/~bjwever

PS. Don't think firefox will keep you save from hackers, I _know_ it won't ;) 
But more on that later...
PS2. Recursive function call will cause stack overflow causing write exception 
in guard page on a push, no control over registers.


= = = = = = = = = = = = = = = = = = = =
                        

                           Cheers, 
        isno
        isno@xfocus.org
          2004-11-26
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