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ssh mitm server for security audits supporting publickey authentication, session hijacking and file manipulation

Project description

SSH-MITM - ssh audits made simple

SSH-MITM intercepting password login

ssh man-in-the-middle (ssh-mitm) server for security audits supporting
publickey authentication, session hijacking and file manipulation

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SSH-MITM is a man in the middle SSH Server for security audits and malware analysis.

Password and publickey authentication are supported and SSH-MITM is able to detect, if a user is able to login with publickey authentication on the remote server. This allows SSH-MITM to accept the same key as the destination server. If publickey authentication is not possible, the authentication will fall back to password-authentication.

When publickey authentication is possible, a forwarded agent is needed to login to the remote server. In cases, when no agent was forwarded, SSH-MITM can rediredt the session to a honeypot.

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  • publickey authentication
  • hijacking and logging of terminal sessions
  • store and replace files during SCP/SFTP file transferes
  • port porwarding
    • SOCKS 4/5 support for dynamic port forwarding
  • audit clients against known vulnerabilities
  • plugin support

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SSH-MITM can be installed as a Ubuntu Snap, PIP-Package, AppImage, Nix and even runs on Android devices

# install ssh-mitm as snap package
$ sudo snap install ssh-mitm

# install ssh-mitm as python pip package
$ pip install ssh-mitm

# install as Nix package
$ nix-env -iA nixos.ssh-mitm

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To start SSH-MITM, all you have to do is run this command in your terminal of choice.

$ ssh-mitm server --remote-host 192.168.0.x

Now let's try to connect. SSH-MITM is listening on port 10022.

$ ssh -p 10022 testuser@proxyserver

You will see the credentials in the log output.

INFO     Remote authentication succeeded
    Remote Address:
    Username: testuser
    Password: secret
    Agent: no agent

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Session hijacking

Getting the plain text credentials is only half the fun. When a client connects, the ssh-mitm starts a new server, which is used for session hijacking.

INFO     ℹ created mirrorshell on port 34463. connect with: ssh -p 34463

To hijack the session, you can use your favorite ssh client.

$ ssh -p 34463

Try to execute somme commands in the hijacked session or in the original session.

The output will be shown in both sessions.

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Phishing FIDO Tokens

SSH-MITM is able to phish FIDO2 Tokens which can be used for 2 factor authentication.

The attack is called trivial authentication (CVE-2021-36367, CVE-2021-36368) and can be enabled with the command line argument --enable-trivial-auth.

ssh-mitm server --enable-trivial-auth

Using the trivial authentication attack does not break password authentication, because the attack is only performed when a publickey login is possible.

Video explaining the phishing attack:
Click to view video on
Click to view video on

Downlaod presentation slides

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Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

  1. Fork the Project
  2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
  3. Commit your Changes (git commit -m 'Add some AmazingFeature')
  4. Push to the Branch (git push origin feature/AmazingFeature)
  5. Open a Pull Request

See also the list of contributors who participated in this project.

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