During a recent engagement I was asked to perform a penetration test of a Citrix environment. One particular requirement of this test was to see whether I could transfer files back and forth between my local computer and the remote environment.

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The easiest way to transfer data was through their web proxy. Although it implemented some sort of web filtering, Internet access was allowed. I encrypted a document in a zip file and then uploaded it to a web server controlled by Dionach. This allowed me to bypass the filters and accomplish the goal.

Remote Citrix MFA Connection. Username Forgot your username? Password Forgot password? Sign in with my company credentials. Don't have an account? Sign up and try it free. AVOID Firefox on a Mac; use Safari instead. iPad Citrix Receiver users (should be similar for Android, but untested): 1.Read ALL of the Help items under the Settings menu in Citrix Receiver about how different finger swipes work, how the Citrix virtual keyboard can be. STEP 3 Download Client. Select an appropriate. Link to install Citrix client (see screenshot above). Windows Users – Must be Windows 10, 8.1, or Windows 7 os. MAC OS Users – Must be MAC OS Sierra Version 10.11, 10.12, or 10.13. Click ‘here’ to go to the Citrix.

However, the client requested if it was possible to achieve the same result but not using Internet Explorer. I explained them that another way was via Outlook. By attaching the encrypted document in an email it was possible to transfer the file to an attacker’s email address.

Not entirely convinced, the client asked me if there was another method in case within Citrix environment Internet access was completely denied.

I started messing around with Citrix preferences and settings. When you connect to the remote machine via Citrix on top of the Desktop Viewer there some configurations settings, but unfortunately it didn’t let me get very far.

Copy and Paste was disabled and I could not drag and drop files. However, eventually I came up with this solution which allowed me to transfer files quite easily via USB redirection. The steps are:

1) Connect a USB drive to the local machine.

2) Open “Connection Center” by right-clinking the Citrix icon in the Notification Area on bottom right of the Windows taskbar.

3) Click “Connection Center” under Advanced tab.

4) Inside “Connection Center” expands all the options. In my case I had the option to launch an instance of Microsoft OneNote 2010 by double clicking on the icon.

5) Inside Microsoft OneNote, go to “open” and then “browse”.

6) At this stage it is now possible to access the local USB drive within the Citrix environment.

7) Using copy and paste functionality, I copied the TEST.txt file to the Desktop of the Citrix environment.

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8) The TEST.txt file is therefore available on the Desktop of the Citrix environment.

9) The same process can be used to copy files from the Citrix environment to the local computer.

In this particular case Citrix allowed me to map local USB drives, highlighting a poor configuration of Citrix. The following articles provide further information on how to enable and disable USB redirection.

https://support.citrix.com/article/CTX137939
https://support.citrix.com/proddocs/topic/xenapp-xendesktop-76/xad-hdx-usb-cdm.html

Dionach recommend that Citrix environments are regularly tested in order to find vulnerabilities which can be used by attackers such as a rogue employee. As it happened in this case, by breaking out of the Citrix environment, it allowed the Dionach consultant to have a foothold in the internal network and eventually to compromise the entire domain.

Via a Windows Computer

Note: Accessing the USAR RAP will keep your ARNet account active between Battle Assemblies (BA). You do need to [already] have an ARNet account before attempting to access. If you don't have an ARNet account, Army Reserve Soldiers can request one via: https://aramp.usar.army.mil (You need to have your AKO username and password ready).

NOTE: For problems or questions regarding your ARNet account, call the Army Enterprise Service Desk-Reserve

Accessing the USAR RAP requires the following pre-access steps listed below and an active Army Reserve Network (ARNet) account before continuing.

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If you can already access your mail.mil email from your computer, you may already have PreAccess 1-4 complete, but still need to complete PreAccess 5.

You are logging into a virtual version of your ARNet desktop

More information:

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You can use Outlook on this virtual desktop. Please wait about 5 minutes after you log into the server before clicking it, or it will fail.

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Do not save any files on this desktop, as they will get deleted. Save files to your network drives.

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If you have problems with the Army Reserve Remote Access Portal, contact the help desk