23 - Pentesting Telnet

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Taarifa za Msingi

Telnet ni protokali ya mtandao inayowapa watumiaji njia isiyo salama ya kufikia kompyuta kupitia mtandao.

Bandari ya Kawaida: 23

23/tcp open  telnet

Uhesabu

Kuchukua Bango

bash
nc -vn <IP> 23

Uchunguzi wote wa kuvutia unaweza kufanywa na nmap:

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

The script telnet-ntlm-info.nse itapata taarifa za NTLM (matoleo ya Windows).

From the telnet RFC: Katika Protokali ya TELNET kuna "options" mbalimbali ambazo zitakubaliwa na zinaweza kutumika na muundo wa "DO, DON'T, WILL, WON'T" ili kumruhusu mtumiaji na seva kukubaliana kutumia seti ya makubaliano ya kina (au labda tofauti tu) kwa ajili ya muunganisho wao wa TELNET. Chaguzi hizo zinaweza kujumuisha kubadilisha seti ya wahusika, hali ya echo, n.k.

Ninajua inawezekana kuhesabu chaguzi hizi lakini sijui jinsi, hivyo nijulishe kama unajua jinsi.

Brute force

Config file

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

HackTricks Amri za Otomatiki

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.wiki/en/network-services-pentesting/pentesting-telnet.html

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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