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hacktricks/network-services-pentesting/pentesting-telnet.md

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23 - Pentesting Telnet

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Osnovne informacije

Telnet je mrežni protokol koji korisnicima pruža nesiguran način pristupa računaru preko mreže.

Podrazumevani port: 23

23/tcp open  telnet

Enumeracija

Prikupljanje banera

nc -vn <IP> 23

Sve zanimljivo enumerisanje može se izvršiti pomoću nmap:

nmap -n -sV -Pn --script "*telnet* and safe" -p 23 <IP>

Skripta telnet-ntlm-info.nse će dobiti NTLM informacije (verzije Windows-a).

Iz telnet RFC: U TELNET protokolu postoje razne "opcije" koje će biti odobrene i mogu se koristiti sa strukturom "DO, DON'T, WILL, WON'T" kako bi se omogućilo korisniku i serveru da se dogovore o korišćenju složenijeg (ili možda samo drugačijeg) skupa konvencija za njihovu TELNET vezu. Takve opcije mogu uključivati promenu skupa karaktera, režim eha, itd.

Znam da je moguće enumerisati ove opcije, ali ne znam kako, pa me obavestite ako znate kako.

Brute force

Konfiguracioni fajl

/etc/inetd.conf
/etc/xinetd.d/telnet
/etc/xinetd.d/stelnet

HackTricks Automatske Komande

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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