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Port 4156 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
4156 udp worm-linux Linux.Slapper.Worm (09.13.2002) - family of worms that use an OpenSSL buffer overflow exploit to run a shell on a remote computer. Targets vilnerable Apache Web servers under various Linux distributions. The worm has distributed denial of service (DDoS) attack capabilities. It spreads by exploiting ports 80/tcp and 443/tcp.

Opens backdoors on the following ports:
The .A variant of the worm listens on port 2002/udp.
The .B variant listens on port 1978/udp.
The .C variant listens on port 4156/udp (and port 1052/tcp periodically).
4156 udp trojan Slapper Trojans
4156 tcp,udp stat-results STAT Results IANA
4096-4224 udp applications Quadrox GuardDVR Portforward
4096-4224 udp applications Quadrox GuardNVR Portforward
4096-4224 udp applications Quadrox WebCCTV DVR Portforward
4096-4224 udp applications Quadrox WebCCTV NDVR Portforward
4096-4224 udp applications Quadrox WebCCTV NVR Portforward
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External Resources
SANS Internet Storm Center: port 4156

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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