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Port 123 Details


known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
123 udp NTP Network Time Protocol (NTP) - used for time synchronization [RFC 5905]

Security Concerns:
It provides both information and possible avenue of attack for intruders. Info gathered can include system uptime, time since reset, time server pkt, I/O & memory statistics and ntp peer list. If a host is susceptible to time altering via ntp an attacker can possibly:
1) Run replay attacks using captured OTP and Kerberos tickets before they expire.
2) Stop security-related cron jobs from running or cause them to run at incorrect times.
3) Make system and audit logs unreliable since time is alterable.

Vodafone Sure Signal also uses this port
SG
123 tcp trojan Net Controller trojan

Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote attackers to conduct off-path attacks.
References: [CVE-2019-11331], [BID-108010], [XFDB-159889]
SG
123 udp Network Time Protocol (NTP) - used for time synchronization (official) Wikipedia
123 tcp trojan [trojan] Net Controller Trojans
123 tcp NetController [trojan] Net Controller SANS
123 tcp,udp applications NTP Portforward
123 tcp threat Madfind Bekkoame
123 tcp,udp ntp Network Time Protocol [RFC5905] IANA
8 records found

Related ports: 50  500  4500  33434  

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