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Port 623 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
623 tcp trojan RTB 666

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 Port is used by IMPI and BMC management systems. 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]
623 udp ASF Remote Management and Control Protocol (ASF-RMCP) (official) Wikipedia
623 tcp trojan RTB 666 Trojans
623 tcp oob-ws-http DMTF out-of-band web services management protocol IANA
623 udp asf-rmcp ASF Remote Management and Control Protocol IANA
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
9 records found
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Related ports: 680  

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External Resources
SANS Internet Storm Center: port 623

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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