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Port 113 Details
known port assignments and vulnerabilities
threat/application/port search:
| Port(s) |
Protocol |
Service |
Details |
Source |
| 113 |
tcp,udp |
IDENT |
Port 113 used for Identification/Authorization service. When a client program on your end contacts a remote server for services such as POP, IMAP, SMTP, IRC, FTP, etc. that remote server sends back a query to the IDENT port 113 asking for identification from your system...
Port 113 can be probed by attackers and it poses some security concerns, but the problem with filtering/stealthing port 113 is that if legitimate requests get no response at all from port 113 queries, the connection to them (which initiated their query in the first place) will be delayed or perhaps even completely abandoned.
The simplest solution is to close, rather than filter port 113.
Some trojans also use this port: ADM worm, Alicia, Cyn, DataSpy Network X, Dosh, Gibbon, Invisible Identd Deamon, Kazimas, Taskman,W32.Korgo.F
W32.Bofra.C@mm [Symantec-2004-111113-3948-99] (2004.11.11) - It opens ports 1639/tcp and 1640/tcp for listening, opens an ident daemon on port 113/tcp, connects to IRC servers on port 6667/tcp.
W32.Linkbot.A [Symantec-2004-110516-3932-99] (2004.11.05) - worm that exploits the MS Windows LSASS Buffer Overrun Vulnerability. It also creates an IRC backdoor and attempts to install adware on the infected machine. It can affect all current Windows versions. Listens on port 113/tcp for remote commands.
W32.Spybot.LZI [Symantec-2005-040609-3623-99] (2005.04.06) - worm that attempts to exploit the MS DCOM RPC vulnerability on ports 135, 445 & 1025. Opens a backdoor on port 113.
W32.Linkbot.M [Symantec-2005-052109-2651-99] (2005.05.21) - opens a backdoor on port 6667/tcp. Also listens on port 113/tcp.
Stack-based buffer overflow in TinyIdentD 2.2 and earlier allows remote attackers to execute arbitrary code via a long string to TCP port 113.
References: [CVE-2007-2711] [BID-23981] [SECUNIA-25248] [OSVDB-36053]
Backdoor.Win32.Whisper.b / Remote Stack Corruption - Whisper.b listens on TCP port 113 and connects to port 6667, deletes itself drops executable named rundll32.exe in Windows\System dir. The malware is prone to stack corruption issues when receiving unexpected characters of random sizes.
References: [MVID-2021-0039] |
SG
|
| 113 |
udp |
|
ident - old user identification system, still used by IRC servers to identify users (official) |
Wikipedia
|
| 113 |
tcp,udp |
|
Authentication Service (auth) (official) |
Wikipedia
|
| 113 |
tcp |
trojan |
ADM worm, Alicia, Cyn, DataSpy Network X, Dosh, Gibbon, Taskman |
Trojans
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| 113 |
tcp,udp |
auth |
ident tap Authentication Service |
SANS
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| 113 |
tcp,udp |
auth |
ident, tap, Authentication Service |
Nmap
|
| 113 |
tcp,udp |
auth |
ident Authentication Service |
Neophasis
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| 113 |
tcp |
InvisibleIdentdDaemon |
[trojan] Invisible Identd Daemon |
Neophasis
|
| 113 |
tcp |
InvisibleIdentdDeamon |
[trojan] Invisible Identd Deamon |
Neophasis
|
| 113 |
tcp |
Kazimas |
[trojan] Kazimas |
Neophasis
|
| 113 |
tcp |
threat |
Invisible Identd Deamon |
Bekkoame
|
| 113 |
tcp |
threat |
Kazimas |
Bekkoame
|
| 113 |
tcp |
threat |
Randex |
Bekkoame
|
| 113 |
tcp |
threat |
W32.Bofra |
Bekkoame
|
| 113 |
tcp |
threat |
W32.Korgo |
Bekkoame
|
| 113 |
tcp |
threat |
W32.Linkbot |
Bekkoame
|
| 113 |
tcp |
threat |
W32.Mydoom |
Bekkoame
|
| 113 |
tcp |
threat |
W32.Spybot |
Bekkoame
|
| 113 |
tcp,udp |
auth |
Authentication Service |
IANA
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19 records found
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External Resources
SANS ISC: port 113
Notes:
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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