TCP ports use the Transmission Control Protocol, the most commonly used protocol Used port numbers for well-known internet services. IANA is responsible for internet protocol resources, including the registration of commonly Ports are unsigned 16-bit integers (0-65535) that identifyĪ specific process, or network service. Port numbers in computer networking represent communication endpoints. Microsoft Terminal Server (RDP) officially registered as Windows Based Terminal (WBT) (unofficial) Zmodo Geovision also uses port 3389 (TCP/UDP) Legitimate new connections will fail at this point with an error of either a connection timeout, or the terminal server has ended the connection.Ī vulnerability exists in the Remote Desktop Protocol (RDP), where an attacker could send a specially crafted sequence of packets to TCP port 3389 which can result in RDP to accessing an object in memory after it has been deleted. Individual connections will timeout, but a low bandwidthĬontinuous attack will maintain a terminal server at maximum memory utilization and prevent new connections from a legitimate source from taking place. A remote attacker can quickly cause a server to reach full memory utilization by creating a large number of normal TCP connections to port 3389. This port is vulnerable to Denial of Service Attack Against Windows NT Terminal Server. ![]() Trojans using this port:, TSPY_AGENT.ADDQ Port is IANA registered for Microsoft WBT Server, used for Windows Remote Desktop and Remote Assistance connections ( RDP - Remote Desktop Protocol).
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