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Port 873 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
873 tcp applications QNAP NAS uses the following ports:
Web server: 80,8081 TCP and 443,8080 TCP (web admin)
FTP/SFTP/SSH: 20,21,22 TCP and 13131 TCP (telnet)
Remote Replication: 873,8899 TCP
VPN server: 1723 TCP (PPTP), 1194 UDP (OpenVPN)
CloudLink: port 20001 UDP (optional, only required for access without manual port forwarding)

The ANTlabs InnGate firmware on IG 3100, IG 3101, InnGate 3.00 E, InnGate 3.01 E, InnGate 3.02 E, InnGate 3.10 E, InnGate 3.01 G, and InnGate 3.10 G devices does not require authentication for rsync sessions, which allows remote attackers to read or write to arbitrary files via TCP traffic on port 873.
References: [CVE-2015-0932]

F5 BIG-IP could allow a remote attacker to execute arbitrary code on the system, caused by an error within the ConfigSync Access Control Handler component. By connecting to the rsync service on TCP port 873, an attacker could exploit this vulnerability to gain read or write access to the system and execute arbitrary code on the system with root privileges.
References: [XFDB-95624], [EDB-34465]
873 tcp rsync file synchronisation protocol (official) Wikipedia
873 tcp,udp rsync rsync IANA
873 tcp rsync Rsync server ( ) Nmap
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Related ports: 1194  8081  8899  13131  20001  

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External Resources
SANS Internet Storm Center: port 873

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, 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, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible 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, where dropping some packets is preferable to waiting for delayed data.

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