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Port 544 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
544 tcp kshell Kerberos remote shell
Related ports: 88,464,543,749,751

A vulnerability has been reported in Cisco IOS, which can be exploited by malicious people to cause a DoS (Denial of Service). The vulnerability is caused due to TCP connection information not being properly validated when connecting to a protocol translation resource and can be exploited to cause a reload via specially crafted packets sent to TCP ports 514 or 544. Successful exploitation requires a vulnerable protocol translation configuration or a Telnet-to-PAD protocol translation ruleset to be configured.
References: [CVE-2013-1147] [SECUNIA-52785]
544 tcp kshell, Kerberos Remote shell (official) Wikipedia
544 tcp,udp kshell krcmd Kerberos (v4/v5) Nmap
544 tcp,udp kshell krcmd IANA
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Related ports: 88  464  514  543  749  751  

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External Resources
SANS Internet Storm Center: port 544

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.

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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