Date: Fri, 12 Sep 2003 11:25:25 +0200
From: jelmer <jkuperus@...net.nl>
To: Thor Larholm <thor@...x.com>, bugtraq@...urityfocus.com
Cc: full-disclosure@...ts.netsys.com
Subject: Re: Internet explorer 6 on windows XP allows
 exection of arbitrary code



----- Original Message ----- 
From: "Thor Larholm" <thor@...x.com>
To: "jelmer" <jkuperus@...net.nl>; <bugtraq@...urityfocus.com>
Cc: <full-disclosure@...ts.netsys.com>
Sent: Friday, September 12, 2003 1:02 AM
Subject: Re: [Full-Disclosure] Internet explorer 6 on windows XP allows
exection of arbitrary code


> The new addition here is abusing how you are able to load a ressource
file,
> residing in a  local security zone, into a window object. Service Pack 1
for IE6
> did a lot to deter this on most regular window objects, but should have
extended
> that effort to searchpanes as well. Seeing as the content of a search pane
can
> be any registered COM extension to IE, perhaps more should be done to
completely
> separate these from the reach of ordinary scripting.

Agreed, I noticed they did put some effort into fixing these issues
eg. the greymagic issue with the malformed xml file for instance only
allowed  xss'ing a a site containinging this file.
before sp1 one would have been able to script in the res:// page. wich would
have much more severe consequences concidering that
IE's zoning system is just so horribly and utterly broken.  So they did well
on this , the problem just is that microsoft keeps having these
little oversights, special cases they forget about such as the res pages in
the mediabar or also recently forgetting to patch the dynamic version of the
object tag.
It's generally a tell tale sign of bad software design


> Combining the mediabar ressource loading with the file-protocol proxy
> demonstrates just how effectively one can combine several vulnerabilities
to
> achieve a higher level of automation in planting and executing files. The
media
> bar ressource loading, and any other ressource loading technique, can be
> combined with any other cross-domain scripting vulnerability to achieve
the same
> result.
>
> We will definitely see more combinatorial vulnerabilities in the time to
come.

Combining vulnerabilies is nothing new people always have and always will.
HTTP-EQUIV seems especially well versed in this kind of stuff, remember for
instance my mhtml/codebase trick and his mediaplayer issue wich also lead to
code execution.
IE is rather heavily researched so at any given time you will have quite a
number of unpatched vulnerabilties, as you are probably more aware of than
anybody, considering http://pivx.com/larholm/unpatched/ is your site :)
For non buffer overflow  code execution generally a number of conditions has
to be met. in this case it where 3

- find way of executing code
- find something to inject the exploit code in
- find something that will allow us to inject exploit code into stuff not
under our control

seperatly none of these is perticularly dangerous but combined their full
power is unleeched
But it's a lot to ask from a single researcher to ask to come up with 3
issues (unless your name is Liu Die Yu  offcourse :) then you can easily
come up with 10 hehe) I got to 2 liu provided 3



>
>
> Regards
> Thor Larholm
> PivX Solutions, LLC - Senior Security Researcher
> http://www.pivx.com/larholm/unpatched - Unpatched IE vulnerabilities
>
>
> ----- Original Message ----- 
> From: "jelmer" <jkuperus@...net.nl>
> To: <bugtraq@...urityfocus.com>
> Cc: <full-disclosure@...ts.netsys.com>
> Sent: Thursday, September 11, 2003 3:31 PM
> Subject: [Full-Disclosure] Internet explorer 6 on windows XP allows
exection of
> arbitrary code
>
>
> > Internet explorer 6 on windows XP allows exection of arbitrary code
> >
> > DESCRIPTION :
> >
> > Yesterday Liu Die Yu released a number series of advisories concerning
> > internet explorer
> > by combining on of these issues with an earlier issue I myself reported
a
> > while back
> > You can construct a specially crafted webpage that can take any action
on a
> > users system
> > including but not limited to, installing trojans, keyloggers, wiping the
> > users harddrive etc.
> <snip
>
http://lists.netsys.com/pipermail/full-disclosure/2003-September/009917.html>
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.netsys.com/full-disclosure-charter.html

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