What is Telnet

• What is Telnet?

  Telnet is an application protocol which allows you, with the use of a telnet client, to connect to and execute commands on a remote machine that's hosting a telnet server.

  The telnet client will establish a connection with the server. The client will then become a virtual terminal- allowing you to interact with the remote host.

• Replacement

  Telnet sends all messages in clear text and has no specific security mechanisms. Thus, in many applications and services, Telnet has been replaced by SSH in most implementations.
  

• How does Telnet work?

  The user connects to the server by using the Telnet protocol, which means entering "telnet" into a command prompt. The user then executes commands on the server by using specific Telnet commands in the Telnet prompt. You can connect to a telnet server with the following syntax: "telnet [ip] [port]"

Find Telnet Port

Nmap

nmap -sV -SC IP -p23

• Possible to find Telnet on an other port

Connection

Telnet

telnet [ip] [port]

• IP ---> Target IP
• PORT ---> Port we want to interact with (example -> 110)

Exploit CVE

• https://www.cvedetails.com/ (opens in a new tab)
• https://cve.mitre.org/ (opens in a new tab) (opens in a new tab)