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Re: Remote Desktop Command Fixation Attacks
From: "pdp (architect)" <pdp.gnucitizen () googlemail com>
Date: Thu, 11 Oct 2007 01:24:48 +0100

Steve,

try to email someone from your company a batch file. i am sure that
that will fail, mainly because you realize that it is a security risk.
right? now try to email a .rdp or .ica file. it works 99% of all the
time.

second, please read the article. :) no offense, but you are completely
missing the point here. 3rd, users does not need to have admin rights,
these rights can be obtained with privilege escalations exercise. this
is not A to Z attack. you are missing all other letters in between.

this is just my humble opinion.

cheers,
pdp

On 10/10/07, Steve Shockley <steve.shockley () shockley net> wrote:
pdp (architect) wrote:
The attack is rather simple. All the bad guys have to do is to compose
a malicious RDP (for Windows Terminal Services) or ICA (for CITRIX)
file and send it to the victim. The victim is persuaded to open the
file by double clicking on it. When the connection is established, the
user will enter their credentials to login and as such let the hackers
in. Vicious!

So, "all you have to do" is persuade the user to run an attachment and
type in credentials.  Wouldn't it be simpler to just email the user a
batch file and have them run it?  Why not just use the same message from
"Tim from Tech Department" and substitute a web page for the RDP file?

It's not clear from your article, but I assume you're having the user
connect to their normal Citrix or TS farm to run the program.  First,
why in the world would you give users administrative rights on your
servers?  Secondly, why wouldn't you use software restriction policies
to whitelist only allowed apps on your server?

 > I will show you how easy it is to compromise a well protected Windows
Terminal or CITRIX server

No, you showed how to compromise a poorly-configured TS or Citrix server.

 > Security in depth does not exist!

Sounds more like shallow configurations.



-- 
pdp (architect) | petko d. petkov
http://www.gnucitizen.org


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