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Re: Citrix application breakout - take care of Microsoft calculator
From: "Shreyas Zare" <shreyas () technitium com>
Date: Tue, 18 Mar 2008 15:49:13 +0530

Also, you can disable the Task Scheduler service so that AT wont work.

On 3/18/08, Robert S. Slifkin <rob () slifkin net> wrote:
Yes, that can be particularly dangerous.  From there you can launch the
 explorer shell to get a full desktop and everything with System
 privileges.


 ____________________________________
 Robert S. Slifkin
 Email: Rob () slifkin net
 Phone: 203.962.3878

 -----Original Message-----
 From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
 On Behalf Of Bill Stout
 Sent: Monday, March 17, 2008 12:32 AM
 To: pen-test () securityfocus com
 Subject: Re: Citrix application breakout - take care of Microsoft
 calculator


 Or this command string, which will pop up a second command window, but
 with 'system' privileges.

 c:\> at 21:00 /interactive %systemroot%\system32\cmd.exe


 Bill Stout


 ----- Original Message ----
 > From: "infolookup () gmail com" <infolookup () gmail com>
 > To: Erik Soosalu <eriks () nationalfastfreight com>;
 > listbounce () securityfocus com; pen-test () securityfocus com
 > Sent: Wednesday, March 12, 2008 4:46:34 AM
 > Subject: Re: Citrix application breakout - take care of Microsoft
 > calculator
 >
 > A discussion of this nature started a while back where someone noted
 > that you could if giving regular user rights on a Citrix terminal
 > still browse the network for shares.
 >
 > Right click your desktop, select new shortcut and browse to
 > system32/cmd.exe get a list of host name and available shares.
 >
 > Then open up MS word and create a link to the share, click on it then
 > you are browsing the share, or network place in question, in some
 > cases you can even browse the underlining Citrix server that you are
 > connected too, or create a folder and copy anything to it.
 > Sent from my Verizon Wireless BlackBerry
 >
 > -----Original Message-----
 > From: "Erik Soosalu"
 >
 > Date: Mon, 10 Mar 2008 12:50:40
 > To:
 > Subject: RE: Citrix application breakout - take care of Microsoft
 > calculator
 >
 >
 > Once you're in Notepad, File->Open, browse to Windows/system32, find
 > cmd.exe right click and open and you have a command prompt on the box.

 > Of course, your could specify any UNC and get a file to load from
 > wherever you want. Not sure what the actual run permissions would
 be....
 >
 > Erik
 >
 >
 >
 > ________________________________
 >
 > From: listbounce () securityfocus com on behalf of Stefan Gora
 > Sent: Fri 3/7/2008 6:13 AM
 > To: pen-test () securityfocus com
 > Subject: Citrix application breakout - take care of Microsoft
 > calculator
 >
 >
 >
 > Dear all,
 >
 > I'm not shure if the following issue is already known or exciting,
 > nevertheless the following attack vector found during a penetration
 > test might be interesting:
 >
 > A customer has built a Citrix environment for a partner company to
 > provide access to a specific application. This application was
 > intended to be the only application accessible for this partner. It
 > was possible to get a remote task manager with CRTL-F3, but no other
 > way of interacting with the Citrix Server (e.g. through printing or
 so).
 >
 > Unfortunately they have integrated Microsoft's calculator into the
 > application. A bad idea - guess why ;-).
 >
 > Using the calculator you are able to do funny stuff: Open the
 > calculator and click "info". Klick on the licence agreement and here
 > you go, you have got an editor. With this you can use "open file" and
 > browse the server, find for example Word and rightclick on "Open" -
 > Word is running, and all other applications which you like as well ...
 >
 > I think this can easily be fixed using more restrictive file
 > permissions, but I thought maybe some of you might find this
 > information useful.
 >
 > Stefan
 >
 > --
 > --------------------------------------------------------
 > Identity Management Symposium 22.-23.04.2008 KA/Ettlingen
 > http://www.identity-management-symposium.de
 >
 > --------------------------------------------------------
 >
 > Stefan Gora
 > Security Consultant
 >
 > Secorvo Security Consulting GmbH
 > Ettlinger Strasse 12-14, D-76137 Karlsruhe Tel. +49 721 255171-302,
 > Fax +49 721 255171-100 stefan.gora () secorvo de, http://www.secorvo.de
 > PGP: 5EAD 34FE F3C1 0FEB 058F 4DD0 E6B3 FF4A
 >
 > Mannheim HRB 108319, Geschaeftsfuehrer: Dirk Fox
 >
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 >
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 This list is sponsored by: Cenzic

 Need to secure your web apps NOW?
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 Click to try it, buy it or download a solution FREE today!

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 ------------------------------------------------------------------------
 This list is sponsored by: Cenzic

 Need to secure your web apps NOW?
 Cenzic finds more, "real" vulnerabilities fast.
 Click to try it, buy it or download a solution FREE today!

 http://www.cenzic.com/downloads
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-- 
("Computers are useless. They can only give you answers." - Pablo Picasso)

Shreyas Zare
Co-Founder, Technitium
eMail: shreyas () technitium com

..::< The Technitium Team >::..
Visit us at www.technitium.com
Contact us at theteam () technitium com

Technitium Personal Computers
We believe in quality.
Visit http://pc.technitium.com for details.

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This list is sponsored by: Cenzic

Need to secure your web apps NOW?
Cenzic finds more, "real" vulnerabilities fast.
Click to try it, buy it or download a solution FREE today!

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