SSH tunneling is a technique that allows you to create a secure connection between two computers over an insecure network. It can be used for various purposes, such as accessing remote servers, bypassing firewalls, or encrypting your traffic. However, SSH tunneling is not foolproof and can be cracked by hackers who want to intercept your data or compromise your system.
In this article, we will show you how to crack SSH tunnel in three easy steps using a tool called SSHtrix. SSHtrix is a fast and multi-threaded SSH login cracker that supports various attack modes, such as brute-force, dictionary, and incremental. It can also detect and bypass anti-brute-force mechanisms, such as time delays, max login attempts, and captcha.
Before we begin, you will need the following:
A Linux machine with SSHtrix installed. You can download it from here and extract it using the command tar xvf sshtrix-0.0.3.tar.gz.
A target machine with SSH service running. You can use any SSH server for testing purposes, such as OpenSSH or Bitvise SSH Server.
A wordlist file containing possible usernames and passwords for the target machine. You can use any wordlist file of your choice, such as SecLists or RockYou.
Now, let's see how to crack SSH tunnel in three easy steps:
Step 1: Scan the target machine for open SSH port
The first step is to scan the target machine for open SSH port using a tool such as Nmap. Nmap is a powerful network scanner that can discover hosts, services, and vulnerabilities on a network. You can install it using the command sudo apt-get install nmap.
To scan the target machine for open SSH port, use the following command:
nmap -p 22 -sV -T4 -v target_ip
This command will scan the target machine for port 22 (the default port for SSH) using service version detection (-sV), aggressive timing (-T4), and verbose output (-v). You can replace target_ip with the IP address of the target machine.
If the scan is successful, you should see something like this:
Nmap scan report for target_ip
Host is up (0.0012s latency).
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 8.4 (protocol 2.0)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 1.23 seconds
This means that the target machine has an open SSH port running OpenSSH 8.4 on Linux.
Step 2: Launch SSH login cracking attack using SSHtrix
The second step is to launch SSH login cracking attack using SSHtrix. SSHtrix can perform various types of attacks, such as brute-force (-b), dictionary (-d), or incremental (-i). For this example, we will use dictionary attack (-d) with a wordlist file containing possible usernames and passwords.
To launch SSH login cracking attack using SSHtrix, use the following command: