123/udp - Pentesting NTP
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The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks.
Default port: 123/udp
PORT STATE SERVICE REASON
123/udp open ntp udp-response
ntpq -c readlist <IP_ADDRESS>
ntpq -c readvar <IP_ADDRESS>
ntpq -c peers <IP_ADDRESS>
ntpq -c associations <IP_ADDRESS>
ntpdc -c monlist <IP_ADDRESS>
ntpdc -c listpeers <IP_ADDRESS>
ntpdc -c sysinfo <IP_ADDRESS>
nmap -sU -sV --script "ntp* and (discovery or vuln) and not (dos or brute)" -p 123 <IP>
- ntp.conf
NTP protocol by design uses UDP to operate, which does not require any handshake like TCP, thus no record of the request. So, NTP DDoS amplification attack begins when an attacker crafts packets with a spoofed source IP to make the packets appear to be coming from the intended target and sends them to NTP server. Attacker initially crafts the packet of few bytes, but NTP responds with a large amount of data thus adding to amplification of this attack.
MONLIST command: It is a NTP protocol command which has very little use, but it is this command which is the main culprit for this attack. However, the use of MONLIST command is to give details of the last 600 clients that have connected to the NTP time service. Below is the command syntax:
ntpdc -n -c monlist <IP>
ntp
Protocol_Name: NTP #Protocol Abbreviation if there is one.
Port_Number: 123 #Comma separated if there is more than one.
Protocol_Description: Network Time Protocol #Protocol Abbreviation Spelled out
​
Entry_1:
Name: Notes
Description: Notes for NTP
Note: |
The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks.
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https://book.hacktricks.xyz/pentesting/pentesting-ntp
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Entry_2:
Name: Nmap
Description: Enumerate NTP
Command: nmap -sU -sV --script "ntp* and (discovery or vuln) and not (dos or brute)" -p 123 {IP}
​
Did you know that crypto projects pay more bounty rewards than their web2 counterparts?
This crypto bounty alone is worth $1.000.000!
Check out the top-paying bounties among crypto projects.
Sign up on HackenProof to get rewarded without delays and become the web3 hacker legend.
- Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access to the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!