77 lines
2.4 KiB
Markdown
77 lines
2.4 KiB
Markdown
# 23 - Pentesting Telnet
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## **Basic Information**
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Telnet is a network protocol that gives users a UNsecure way to access a computer over a network.
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**Default port:** 23
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```text
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23/tcp open telnet
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```
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## **Enumeration**
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### **Banner Grabbing**
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```bash
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nc -vn <IP> 23
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```
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All the interesting enumeration can be performed by **nmap**:
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```bash
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nmap -n -sV -Pn --script "*telnet* and safe" -p 23 <IP>
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```
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The script `telnet-ntlm-info.nse` will obtain NTLM info \(Windows versions\).
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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. \(From the [telnet RFC](https://tools.ietf.org/html/rfc854)\)
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**I know it is possible to enumerate this options but I don't know how, so let me know if know how.**
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### [Brute force](../brute-force.md#telnet)
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## Config file
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```bash
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/etc/inetd.conf
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/etc/xinetd.d/telnet
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/etc/xinetd.d/stelnet
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```
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## HackTricks Automatic Commands
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```text
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Protocol_Name: Telnet #Protocol Abbreviation if there is one.
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Port_Number: 23 #Comma separated if there is more than one.
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Protocol_Description: Telnet #Protocol Abbreviation Spelled out
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Entry_1:
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Name: Notes
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Description: Notes for t=Telnet
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Note: |
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wireshark to hear creds being passed
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tcp.port == 23 and ip.addr != myip
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https://book.hacktricks.xyz/pentesting/pentesting-telnet
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Entry_2:
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Name: Banner Grab
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Description: Grab Telnet Banner
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Command: nc -vn {IP} 23
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Entry_3:
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Name: Nmap with scripts
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Description: Run nmap scripts for telnet
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Command: nmap -n -sV -Pn --script "*telnet*" -p 23 {IP}
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Entry_4:
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Name: consoleless mfs enumeration
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Description: Telnet enumeration without the need to run msfconsole
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Note: sourced from https://github.com/carlospolop/legion
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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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```
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