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Port 79 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
79 tcp,udp Finger Finger

Finger Security Concerns: Provides key host info to attacker - Fingered host can be DOSd if hit with a recursive finger script till its memory and swap space fill. - Fingering clients can be DOSd if they finger a maliciously configured host (returns data overload - causing client to beep continually - etc.). - If fingering clients allow programmable keys - a maliciously configured host can return a finger response that maps a key to rm -rf /-. Disable on all host unless finger service is stubbed to only provide scripted data response (eg: system admin contact info - etc.).

Trojans that also use this port: ADM worm, Back Orifice 2000 (BO2K), CDK trojan (ports 79, 15858), Firehotcker (ports 79, 5321)

The legacy finger service (TCP port 79) is enabled by default on various older Lexmark devices.
References: [CVE-2019-10059]
79 tcp Finger protocol (official) Wikipedia
79 tcp trojan ADM worm, Firehotcker Trojans
79 tcp BO2KDataPort [trojan] Back Orifice 2000 (BO2K) Data Port Neophasis
79 tcp CDK [trojan] CDK Neophasis
79 tcp Firehotcker [trojan] Firehotcker Neophasis
79 tcp threat RAT:Firehotcker Requires VB CDK Bekkoame
79 tcp,udp finger Finger. Unauthorized use by some mail users (see [RFC4146] for details) IANA
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Related ports: 70  5321  15858  

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External Resources
SANS Internet Storm Center: port 79

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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