OverTheWire Behemoth Level 0 tutorial!!

Login

For Behemoth, the server details are:

ssh behemoth0@behemoth.labs.overthewire.org -p 2221
# password: behemoth0

Username: behemoth0 Host: behemoth.labs.overthewire.org Port: 2221 Password: behemoth0

Task

Level 0 is the warm-up. The only challenge is to log into the server successfully. From here, you’ll move on to interacting with real setuid binaries.

A little bit of Theory

• SSH (Secure Shell) is used to connect securely to a remote machine.

• General syntax:

  ssh <username>@<host> -p <port>
  

• Here:

  • behemoth0 = username
  • behemoth.labs.overthewire.org = host
  • -p 2221 = custom port for Behemoth

Once logged in, you start in /home/behemoth0. Every new level will escalate into a different user account (behemoth1, behemoth2, …) once you solve the binary.

Further reading:

• Behemoth official page ↗
• SSH (Wikipedia) ↗

Solution

1. Open a terminal Works on macOS/Linux. On Windows, use PowerShell/WSL/PuTTY.

2. Run the SSH command:

   ssh behemoth0@behemoth.labs.overthewire.org -p 2221
   

   → This starts a secure session as user behemoth0.

3. First-time connection: You’ll be asked to trust the host key. Type yes.

4. Enter the password:

   behemoth0
   

   (Note: input is hidden for security, just type it in.)

   

5. Verify login: You should see something like:

   behemoth0@behemoth:~$
   

   Confirm with:

   whoami   # should print: behemoth0
   pwd      # should print: /home/behemoth0
   

6. Disconnect when done:

   exit
   

Troubleshooting Quick Tips

• ssh: connect to host ... port 2221: Connection timed out → Check firewall/internet.
• Permission denied → Double-check username (behemoth0) and password (behemoth0).
• Host key verification failed → Remove the old entry in ~/.ssh/known_hosts.

Congrats 🎉 You’ve successfully logged into Behemoth Level 0. Next, we’ll start playing with actual binaries 👾

Thanks for reading!

Until next time — Otsumachi!! 💖☄️✨