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Port 513 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
513 udp applications Multiple buffer overflows in the Syslog server in ManageEngine EventLog Analyzer 6.1 allow remote attackers to cause a denial of service (SysEvttCol.exe process crash) or possibly execute arbitrary code via a long Syslog PRI message header to UDP port 513 or 514.
References: [CVE-2010-4840]
513 tcp trojans ADM worm, Grlogin

UTStarcom F1000 VOIP WIFI Phone s2.0 running VxWorks 5.5.1 with kernel WIND 2.6 does not allow users to disable access to (1) SNMP or (2) the rlogin port TCP 513, which allows remote attackers to exploit other vulnerabilities such as CVE-2005-3716, or execute arbitrary shell commands via rlogin, which does not require authentication.
References: [CVE-2005-3718] [SECUNIA-17629] [BID-15476]

The Emerson DeltaV SE3006 through 11.3.1, DeltaV VE3005 through 10.3.1 and 11.x through 11.3.1, and DeltaV VE3006 through 10.3.1 and 11.x through 11.3.1 allow remote attackers to cause a denial of service (device restart) via a crafted packet on (1) TCP port 23, (2) UDP port 161, or (3) TCP port 513.
References: [CVE-2012-4703]
513 tcp Login (official) Wikipedia
513 udp Who (official) Wikipedia
513 tcp trojan ADM worm Trojans
513 tcp Grlogin [trojan] Grlogin SANS
513 tcp login BSD rlogind(8) SANS
513 udp who BSD rwhod(8) SANS
513 tcp login BSD rlogind(8) Nmap
513 udp who BSD rwhod(8) Nmap
513 tcp login "remote login a la telnet; automatic authentication performed based on priviledged port numbers and distributed data bases which identify ""authentication domains""" IANA
513 udp who maintains data bases showing who's logged in to machines on a local net and the load average of the machine IANA
12 records found
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Related ports: 514  23  161  

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External Resources
SANS Internet Storm Center: port 513

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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