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Re: Remote Desktop Command Fixation Attacks
From: Steve Shockley <steve.shockley () shockley net>
Date: Wed, 10 Oct 2007 15:38:08 -0400

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.


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