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Port 42 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
42 tcp,udp WINS Port used by WINS (Windows Internet Naming Service).
Worms can exploit a recently announced buffer overflow vulnerability within WINS using this port.

Microsoft - How to help protect against a WINS security issue
Technical Analysis by Steve Frield

W32.Dasher.D (12.19.2005) - a worm that exploits the following MS vulnerabilities: [MS05-051] (on port 53/tcp) and [MS04-045] (on port 42/tcp).
Listens for remote commands on port 53/tcp. Connects to an FTP server on port 21211/tcp. Scans for systems vulnerable to the [MS05-051] exploit on port 1025/tcp.

The WINS service (wins.exe) on Microsoft Windows NT Server 4.0, Windows 2000 Server, and Windows Server 2003 allows remote attackers to write to arbitrary memory locations and possibly execute arbitrary code via a modified memory pointer in a WINS replication packet to TCP port 42, aka the "Association Context Vulnerability."
References: [CVE-2004-1080] [BID-11763] [OSVDB-12378] [SECUNIA-13328]

City of Heroes also uses this port (TCP).

Port was originally assigned to the obsolete ARPA Host name server protocol (pre-DNS).
42 tcp,udp nameserver, ARPA Host Name Server Protocol (official) Wikipedia
42 tcp,udp WINS (unofficial) Wikipedia
42 tcp,udp name Host Name Server IANA
42 tcp,udp nameserver Host Name Server IANA
42 tcp threat W32.Dasher Bekkoame
6 records found
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Related ports: 53  106  421  699  21211  

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External Resources
SANS Internet Storm Center: port 42

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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