hacktricks/pentesting/pentesting-telnet.md

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# 23 - Pentesting Telnet
## **Basic Information**
Telnet is a network protocol that gives users a UNsecure way to access a computer over a network.
**Default port:** 23
```text
23/tcp open telnet
```
## **Enumeration**
### **Banner Grabbing**
```bash
nc -vn <IP> 23
```
All the interesting enumeration can be performed by **nmap**:
```bash
nmap -n -sV -Pn --script "*telnet* and safe" -p 23 <IP>
```
The script `telnet-ntlm-info.nse` will obtain NTLM info \(Windows versions\).
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. \(From the [telnet RFC](https://tools.ietf.org/html/rfc854)\)
**I know it is possible to enumerate this options but I don't know how, so let me know if know how.**
### [Brute force](../brute-force.md#telnet)
## Config file
```bash
/etc/inetd.conf
/etc/xinetd.d/telnet
/etc/xinetd.d/stelnet
```
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## HackTricks Automatic Commands
```text
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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
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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}
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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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```