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**Instantly available setup for vulnerability assessment & penetration testing**. Run a full pentest from anywhere with 20+ tools & features that go from recon to reporting. We don't replace pentesters - we develop custom tools, detection & exploitation modules to give them back some time to dig deeper, pop shells, and have fun. {% embed url="https://pentest-tools.com/" %} ## **Basic Information** Telnet is a network protocol that gives users a UNsecure way to access a computer over a network. **Default port:** 23 ``` 23/tcp open telnet ``` ## **Enumeration** ### **Banner Grabbing** ```bash nc -vn 23 ``` All the interesting enumeration can be performed by **nmap**: ```bash nmap -n -sV -Pn --script "*telnet* and safe" -p 23 ``` The script `telnet-ntlm-info.nse` will obtain NTLM info (Windows versions). From the [telnet RFC](https://datatracker.ietf.org/doc/html/rfc854): In the TELNET Protocol are various "**options**" that will be sanctioned and may be used with the "**DO, DON'T, WILL, WON'T**" structure to allow a user and server to agree to use a more elaborate (or perhaps just different) set of conventions for their TELNET connection. Such options could include changing the character set, the echo mode, etc. **I know it is possible to enumerate this options but I don't know how, so let me know if know how.** ### [Brute force](../generic-methodologies-and-resources/brute-force.md#telnet) ## Config file ```bash /etc/inetd.conf /etc/xinetd.d/telnet /etc/xinetd.d/stelnet ``` ## HackTricks Automatic Commands ``` Protocol_Name: Telnet #Protocol Abbreviation if there is one. Port_Number: 23 #Comma separated if there is more than one. Protocol_Description: Telnet #Protocol Abbreviation Spelled out Entry_1: Name: Notes Description: Notes for t=Telnet Note: | wireshark to hear creds being passed tcp.port == 23 and ip.addr != myip https://book.hacktricks.xyz/pentesting/pentesting-telnet Entry_2: Name: Banner Grab Description: Grab Telnet Banner Command: nc -vn {IP} 23 Entry_3: Name: Nmap with scripts Description: Run nmap scripts for telnet Command: nmap -n -sV -Pn --script "*telnet*" -p 23 {IP} Entry_4: Name: consoleless mfs enumeration Description: Telnet enumeration without the need to run msfconsole Note: sourced from https://github.com/carlospolop/legion Command: msfconsole -q -x 'use auxiliary/scanner/telnet/telnet_version; set RHOSTS {IP}; set RPORT 23; run; exit' && msfconsole -q -x 'use auxiliary/scanner/telnet/brocade_enable_login; set RHOSTS {IP}; set RPORT 23; run; exit' && msfconsole -q -x 'use auxiliary/scanner/telnet/telnet_encrypt_overflow; set RHOSTS {IP}; set RPORT 23; run; exit' && msfconsole -q -x 'use auxiliary/scanner/telnet/telnet_ruggedcom; set RHOSTS {IP}; set RPORT 23; run; exit' ```

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