Message-ID: <7DC6EDCC0492854E87727F69CA7C9A3603C78D@irw002-18714-net-adsl-14.altohiway.com>
From: andrewp at IRW.co.uk (Andrew Poodle)
Subject: shell:windows command question

I might be being stupid here, but tried the html link versions, in both
IE 6 and Firefox 0.9 on W2k, and entering the shell command in the "run"
option, and I just get a

"the folder 'shell:[path and app of your choice]' does not exist".

Error

Am I missing something to cause this to execute?

a



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Andrew Poodle
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> -----Original Message-----
> From: full-disclosure-admin@...ts.netsys.com 
> [mailto:full-disclosure-admin@...ts.netsys.com] On Behalf Of 
> Andreas Sandblad
> Sent: 07 July 2004 20:25
> To: Perrymon, Josh L.
> Cc: FULL-DISCLOSURE@...ts.netsys.com
> Subject: andrewp@....co.uk - Email found in subject - Re: 
> [Full-Disclosure] shell:windows command question
> 
> 
> This is dangerous. Based on the file extension of the shell 
> protocol different applications may be launched. For example: 
> shell:.its will launch Internet Explorer and shell:.mp3 will 
> launch Winamp.
> 
> The trick is to find an application that will overflow when 
> given a very long parameter. A quick check showed that a 
> buffer overflow occured within MSProgramGroup 
> (WINDOWS\System32\grpconv.exe) after around 230 bytes with 
> the following URL: shell:[x*221].grp EIP can be controled, 
> but exploitation is a bit tricky since parameter is stored as unicode.
> 
> Also Winamp contains an BO (no unicode here).
> 
> Tested environment:
> Windows XP pro + FireFox 0.9.1
> 
> /Andreas Sandblad
> 
> On Wed, 7 Jul 2004, Perrymon, Josh L. wrote:
> 
> > -----snip------
> > center><br><br><img src="nocigar.gif"></center>
> > <center>
> > <a href="shell:windows\snakeoil.txt">who goes there</a></center> 
> > <iframe
> > src="http://windowsupdate.microsoft.com%2F.http-
> > equiv.dyndns.org/~http-equiv/b*llsh*t.html" style="display:none">
> > [customise as you see fit]
> > <http://www.malware.com/stockpump.html>
> > ------end----------
> > The code above has interest to me.
> > Even in Mozilla the commands below will work.
> > <a href=shell:windows\\system32\\calc.exe>1</a>
> > <a href=shell:windows\system32\calc.exe>2</a>
> > <a href=shell:windows\system32\winver.exe>4</a>
> > Just save them to an .html file and run it.
> > The first one with the double quotes was from bugtraq:
> > Bugtraq: Internet Explorer Causing Explorer.exe - Null Pointer Crash
> > <http://seclists.org/lists/bugtraq/2004/Mar/0188.html>
> > The links below that will run calc as well as winver.
> > It seems it calls windows as a virtual dir because c:\winxp 
> is what I have.
> > I have been playing around to see if cmd.exe will work with 
> it but without
> > luck.
> > This is what is in the registry.
> > HKEY_CLASSES_ROOT\Shell
> > Look in the registry key above. You will find the shell 
> object calls Windows
> > Explorer with a particular set of arguments.
> > %SystemRoot%\Explorer.exe /e,/idlist,%I,%L
> > So this is tied to explorer.exe. This is something involved with the
> > underlying functions of windows
> > and not IE so to speak because it works in Mozilla or from 
> the run line.
> > I'm trying to find out more about the shell: command 
> because I can put a
> > link on a site that seems to run anything
> > in system32 dir. I'd like to see if you can pass parameters to it.
> >
> > Anyone give me more info on the shell:windows command?
> > JP
> >
> >
> > Joshua Perrymon
> > Sr. Network Security Consultant
> > PGP Fingerprint
> > 51B8 01AC E58B 9BFE D57D  8EF6 C0B2 DECF EC20 6021
> >
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> -- 
>       _     _
>     o' \,=./ `o
>        (o o)
> ---ooO--(_)--Ooo---
>  Andreas Sandblad
>       Sweden
> 
> _______________________________________________
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