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
113	tcp,udp	auth	ident tap Authentication Service	SANS
113	tcp,udp	auth	ident, tap, Authentication Service	Nmap
113	tcp,udp	auth	ident Authentication Service	Neophasis
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

19 records found