The Broadband Guide
search advanced
 forgot password?

Port 1 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
1 udp tcpmux IANA assigned to TCP Port Service Multiplexer.

Sockets des Troie remote access trojan uses this port (a.k.a. Backdoor.Sockets23, Lame, Backdoor.Kamikaze, IRC_trojan, TROJ_Backdoor, W32/Cheval.gen, coded in Delphi 3, 06.1998). It might also use ports 1/udp, 5000, 5001, 30303, 50505, 60000 and 65000.
1 tcp tcpmux Scans against this port are commonly used to test if a machine runs SGI Irix (as SGI is the only system that typically has this enabled). This service is almost never used in practice.

CERT: CA-95.15.SGI.lp.vul

RFC1078 -TCPMUX acts much like Sun's $/Exploits/Ports/111$portmapper$ or Microsoft's $/Exploits/Ports/135$end-point mapper$ in that it allows services to run on abitrary ports. In the case of TCPMUX, however, after the "lookup" phase, all further communication continues to run over that port.

builtins.c in Xinetd before 2.3.15 does not check the service type when the tcpmux-server service is enabled, which exposes all enabled services and allows remote attackers to bypass intended access restrictions via a request to tcpmux port 1 (TCP/UDP).
References: [CVE-2012-0862] [BID-53720] [OSVDB-81774]

Trojans that use this port: Breach.2001, SocketsDeTroie
1 tcp,udp TCP Port Service Multiplexer (official) Wikipedia
1 udp trojan [trojan] Sockets des Troie Trojans
1 tcp,udp tcpmux TCP Port Service Multiplexer IANA
1 tcp tcpmux TCP Port Service Multiplexer [rfc-1078] SANS
1 udp SocketsdesTroie [trojan] Sockets des Troie SANS
1 udp tcpmux TCP Port Service Multiplexer SANS
1 tcp tcpmux TCP Port Service Multiplexer [rfc-1078] Nmap
1 udp tcpmux TCP Port Service Multiplexer Nmap
10 records found
jump to:
previous next

Related ports: 5000  5001  30303  50505  60000  65000  

« back to SG Ports

External Resources
SANS Internet Storm Center: port 1

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.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

Please use the "Add Comment" button below to provide additional information or comments about port 1.
  Post your review/comments
Print this document top
News Glossary of Terms FAQs Polls Cool Links SpeedGuide Teams SG Premium Services SG Gear Store
Registry Tweaks Broadband Tools Downloads/Patches Broadband Hardware SG Ports Database Security Default Passwords User Stories
Broadband Routers Wireless Firewalls / VPNs Software Hardware User Reviews
Broadband Security Editorials General User Articles Quick Reference
Broadband Forums General Discussions
Advertising Awards Link to us Server Statistics Helping SG About