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Port 548 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
548 tcp afpovertcp AppleShare, Personal File Sharing, Apple File Service

ExtremeZ-IP.exe in ExtremeZ-IP File and Print Server 5.1.2x15 and earlier allows remote attackers to cause a denial of service (daemon crash) via an invalid UAM field in a request to the Apple Filing Protocol (AFP) service on TCP port 548.
References: [CVE-2008-0759], [BID-27718]

Novell Netware is vulnerable to a denial of service, caused by a NULL pointer dereference in the AFPTCP.nlm module. By sending a specially-crafted AFP request to TCP port 548, a remote attacker could exploit this vulnerability to cause the application to crash.
References: [CVE-2010-0317], [XFDB-55389], [BID-37616], [OSVDB-61604]
548 tcp Apple Filing Protocol (AFP) over TCP (official) Wikipedia
548 tcp,udp afpovertcp AFP over TCP IANA
548 tcp afp AFP over TCP Nmap
548 udp afp AFP over UDP Nmap
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External Resources
SANS Internet Storm Center: port 548

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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