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Port 389 Details


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Port(s) Protocol Service Details Source
389 tcp LDAP LDAP (Lightweight Directory Access Protocol) - an Internet protocol, used my MS Active Directory,as well as some email programs to look up contact information from a server.

Both Microsoft Exchange and NetMeeting install a LDAP server on this port.

Siemens Openstage and Gigaset phones use the following ports:
389/tcp LDAP
636/tcp LDAPS
5010/tcp - RTP
5060/tcp - SIP gateway, backup proxy
8085/tcp - DLS
18443/TCP and 18444/TCP - provisioning over TLS (HTTPS)

IBM Lotus Domino Server 7.0 allows remote attackers to cause a denial of service (segmentation fault) via a crafted packet to the LDAP port (389/TCP).
References: [CVE-2006-0580], [BID-16523]

Rockliffe MailSite 7.0 and earlier allows remote attackers to cause a denial of service by sending crafted LDAP packets to port 389/TCP, as demonstrated by the ProtoVer LDAP testsuite.
References: [CVE-2006-0790] [BID-16675] [SECUNIA-18888]

Crestron AM-100 with firmware 1.6.0.2 and AM-101 with firmware 2.7.0.2 is vulnerable to denial of service via a crafted request to TCP port 389. The request will force the slideshow to transition into a "stopped" state. A remote, unauthenticated attacker can use this vulnerability to stop an active slideshow.
References: [CVE-2019-3936], [XFDB-160475]

An issue was discovered on Alcatel-Lucent OmniVista 8770 devices before 4.1.2. An authenticated remote attacker, with elevated privileges in the Web Directory component on port 389, may upload a PHP file to achieve Remote Code Execution as SYSTEM.
References: [CVE-2019-20048], [EDB-47761]
SG
389 tcp,udp Lightweight Directory Access Protocol (LDAP) (official) Wikipedia
522,389,1503,1720,1731 tcp applications NetMeeting 2.0 through 3.01 (can also use ports 1024-65535 udp) Portforward
389 tcp ms-ils Microsoft NetMeeting ILS server default port (for versions older than w2k) Neophasis
389 tcp,udp ldap Lightweight Directory Access Protocol IANA
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External Resources
SANS ISC: port 389

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. For more detailed and personalized help please use our forums.

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