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Port 123 Details
known port assignments and vulnerabilities
threat/application/port search:
| 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
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| 123 |
tcp |
trojan |
[trojan] Net Controller |
Trojans
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| 123 |
tcp |
NetController |
[trojan] Net Controller |
SANS
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| 123 |
tcp,udp |
applications |
NTP |
Portforward
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| 123 |
tcp |
threat |
Madfind |
Bekkoame
|
| 123 |
tcp,udp |
ntp |
Network Time Protocol [RFC5905] |
IANA
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8 records found
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jump to:
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Related ports: 50 500 4500 33434
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External Resources
SANS ISC: port 123
Notes:
Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify
a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly
used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
TCP ports use the Transmission Control Protocol, the most commonly used protocol
on the Internet and any TCP/IP network. TCP enables two hosts
to establish a connection and exchange streams of data. TCP guarantees delivery of data
and that packets will be delivered in the same order in which they were sent.
Guaranteed communication/delivery is the key difference between TCP and UDP.
UDP ports use the Datagram Protocol. Like TCP, UDP is used in combination with IP (the Internet Protocol)
and facilitates the transmission of datagrams from one computer to applications on another computer,
but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received
the message to process any errors and verify correct delivery. UDP is often used with time-sensitive
applications, such as audio/video streaming and realtime gaming, where dropping some packets is preferable to waiting for delayed data.
When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them.
This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command.
We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software.
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