FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -SSH or Secure Shell is a program to log into another computer over a network, to execute commands in a remote machine, and to move files from one machine to another. Telnet uses the port 23 and it was designed specifically for local area networks.

Detailed explanation-2: -Port 23 is typically used by the Telnet protocol. Telnet commonly provides remote access to a variety of communications systems. Telnet is also often used for remote maintenance of many networking communications devices including routers and switches.

Detailed explanation-3: -It is configured to provide TELNET remote access (without a password) that pops a shell as root. If an attacker can connect to port 23 on the device, he can completely compromise it.

Detailed explanation-4: -Port 23 (Telnet) Port 23 is a TCP protocol that connects users to remote computers. For the most part, Telnet has been superseded by SSH, but it’s still used by some websites. Since it’s outdated and insecure, it’s vulnerable to many attacks, including credential brute-forcing, spoofing and credential sniffing.

Detailed explanation-5: -The default port for Telnet client connections is 23; to change this default, enter a port number between 1024 and 32, 767.