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Port 6905 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
6905 udp applications This module exploits a remote buffer overflow in the Citrix Provisioning Services 5.6 SP1 (without Hotfix CPVS56SP1E043) by sending a malformed packet to the 6905/UDP port. The module has been successfully tested on Windows Server 2003 SP2, Windows 7, and Windows XP SP3.
References: [BID-49803], [OSVDB-75780]

Citrix Provisioning Services is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by streamprocess.exe component. By sending request type 0x40020006 to UDP Port 6905 a remote attacker could overflow a buffer and execute arbitrary code on the system with SYSTEM privileges or cause the application to crash.
References: [XFDB-72353]
6902-6968 tcp,udp BitTorrent part of full range of ports used most often (unofficial) Wikipedia
6889-6935 tcp,udp Unassigned IANA
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External Resources
SANS Internet Storm Center: port 6905

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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