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Port 5353 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
5353 tcp,udp mdns iChat, Mac OS X Bonjour/Zeroconf port

Multicast DNS (MDNS) [IESG] (IANA official)

Backdoor.Optix.04.E (2004.02.10) - a backdoor trojan horse that gives an attacker unauthorized access to an infected computer by opening TCP port 5353 and listening for incoming connections.

Avahi-core/socket.c in avahi-daemon in Avahi before 0.6.29 allows remote attackers to cause a denial of service (infinite loop) via an empty mDNS IPv4 or IPv6 UDP packet to port 5353.
References: [CVE-2011-1002], [BID-46446]

Remote attackers can perform a denial of service in WebRamp systems by sending a malicious UDP packet to port 5353, changing its IP address.
References: [CVE-1999-0438]
5353 udp Multicast DNS (MDNS) (official) Wikipedia
5353 tcp,udp mdns Multicast DNS IANA
5060, 5190, 5297, 5298, 5353, 5678, 16384-16403 udp applications iChat Portforward
5353 udp zeroconf Mac OS X Bonjour/Zeroconf port Nmap
5353 udp threat WebRamp control Bekkoame
6 records found
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Related ports: 3283  5354  

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External Resources
SANS Internet Storm Center: port 5353

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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