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Port 623 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
623 tcp dmtf IPMI and BMC Remote Management Control Protocol (RMCP) systems typically use port 623/udp, but some servers also listen on port 623/tcp.

RTB 666 trojan

Citrix NetScaler appliance Lights out Management uses ports 4001, 5900, 623 TCP to run a daemon that offers unified configuration management of routing protocols.

Stack-based buffer overflow in the DPC Proxy server (DpcProxy.exe) in ASUS Remote Console (a.k.a. ARC or ASMB3) and allows remote attackers to execute arbitrary code via a long string to TCP port 623.
References: [CVE-2008-1491], [BID-28394]

Port is also IANA registered for DMTF out-of-band web services management protocol.
623 udp ipmi IMPI and BMC Remote Management Control Protocol (RMCP) systems use this port. HP, Dell, and SuperMicro IPMI 1.5 and 2.0 protocols, Intel Xserves Lights-Out-Monitoring (LOM) feature all use this port.
IPMI-based systems have a number of possible attack vectors, such as cleartext passwords, even anonymous access via impitool command to reset the password of any other user without authentication. IPMI 2.0 systems share the (SHA1 or MD5) password hash with unauthenticated clients, allowing for offline cracking. IPMI systems also store user passwords in cleartext, so a single compromised user can be used to trivially obtain even the strongest passwords for other accounts. SuperMicro BMCs are vulnerable to an additional overflow exploit in their UPnP SSDP service (UDP 1900) that will grant root access to the BMC.
See: [CVE-2013-4786], [CVE-2013-4038], [CVE-2013-4037], [CVE-2013-4031]

Cisco Unified Computing System is vulnerable to a buffer overflow, caused by improper bounds checking by the Intelligent Platform Management Interface (IPMI) implementation. By sending a specially-crafted request to UDP port 623, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.
References: [CVE-2013-1183] [XFDB-83771] [BID-59453]
623 udp ASF Remote Management and Control Protocol (ASF-RMCP) (official) Wikipedia
623 tcp trojan RTB 666 Trojans
623 tcp,udp aux_bus_shunt Aux Bus Shunt SANS
623 udp asf-rmcp ASF Remote Management and Control Nmap
623 tcp,udp asf-rmcp ASF Remote Management and Control Protocol Neophasis
623 tcp oob-ws-http DMTF out-of-band web services management protocol, registered 2007-06 IANA
623 udp asf-rmcp ASF Remote Management and Control Protocol IANA
9 records found
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Related ports: 680  4001  5900  1900  

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External Resources
SANS Internet Storm Center: port 623

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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