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Port 106 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
106 tcp poppassd (TCP) poppassd (aka. epass) allows passwords to be changed on POP servers. Traditionally, users would have to have shell (Telnet) accounts on the servers in order to change their passwords. This allows users with just POP access to change their passwords.
The exchange looks something like:

S: 200 Hello
C: user robert
S: 300 Please send current password
C: pass mypassword
S: 200 send New Pass Word
C: newpass newpassword
S: 200 successful
C: quite

Protocol was originally developed for Eudora. Eudora Internet Mail Server vs. 1.2, 2.0, 2.01. DoS If you connect to this server and enter the command "USER xxxxxx" with more than 1000 characters, this service will crash.

Apple Mac OS X Password Server and City of Heroes also use this port.

Mail Management Agent (MAILMA) (a.k.a. Mail Management Server) in Rockliffe MailSite and earlier generates different responses depending on whether or not a username is valid, which allows remote attackers to enumerate valid usernames via user requests to TCP port 106.
References: [CVE-2006-0129]

Buffer overflow in Eudora Internet Mail Server (EIMS) 2.01 and earlier on MacOS systems allows remote attackers to cause a denial of service via a long USER command to port 106.
References: [CVE-1999-1113] [BID-75]
106 tcp 3com-tsmux 3COM-TSMUX SANS
106 tcp pop3pw Eudora compatible PW changer SANS
106 udp 3com-tsmux SANS
106 tcp pop3pw Eudora compatible PW changer Nmap
106 udp 3com-tsmux 3com-tsmux Nmap
106 tcp,udp 3com-tsmux 3COM-TSMUX. Known Unauthorized Use on 106 IANA
7 records found
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External Resources
SANS Internet Storm Center: port 106

Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. 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. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates 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 and realtime gaming, 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.

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