With Nmap we can go far more than with Telnet, we can learn the version of the program running behind the port and we can even test it for vulnerabilities. Bonus: testing specific ports for possible vulnerabilities with Nmap: The lack of authentication methods also allow possible attackers to modify the packages sent between two nodes.īecause of this Telnet was rapidly replaced by SSH (Secure Shell) which provides a variety of authentication methods and also encrypts the whole communication between nodes. Yet, if you want to test many ports and targets simultaneously Telnet isn’t the best option, for which you have Nmap and similar tools About Telnet:Īs said before, Telnet is an unencrypted protocol vulnerable to sniffers, any attacker can intercept the communication between the client and the server in plain text accessing sensible information such as passwords. #The third uncommented line will connect to through sshĬonnections only start after the previous was closed, you can close the connection by passing any character, In the example above I passed “q”. #The second uncommented line will connect to linux.lat through ssh. #The first uncommented line will connect to through port $ Open nano and create a file called multipletelnet.sh with the following content inside: Under Linux you can easily write a little shell script to connect through telnet with different targets and ports.
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