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RE: Citrix application breakout - take care of Microsoft calculator
From: "Shenk, Jerry A" <jshenk () decommunications com>
Date: Sat, 8 Mar 2008 06:51:40 -0500

While you have calc open, you can also go to options, internet options
(why is THAT there?) or options, home, and click on the "help and
support" link and it opens the "Help and Support Center" which has an
option for searching forums which after a few clicks will launch IE.

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of Thor (Hammer of God)
Sent: Friday, March 07, 2008 1:37 PM
To: Stefan Gora; pen-test () securityfocus com
Subject: RE: Citrix application breakout - take care of Microsoft
calculator

Yep, XP and Server 2003's "calc" launches Notepad when you view the
eula.txt ;)  Vista and 2008 do not... they just open a pop-up window in
the same calc.exe process.  Any time you deploy remote desktop/remote
app solutions, you really need to ensure that you've covered all your
bases and ensured that you don't just count on the remote app deployment
mechanism to secure you -- you've got to have your permissions tight.

t



-----Original Message-----
From: listbounce () securityfocus com
[mailto:listbounce () securityfocus com] On Behalf Of Stefan Gora
Sent: Friday, March 07, 2008 3:14 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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