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Port 111 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
111 tcp,udp SunRPC Provides information between Unix based systems. Port is often probed, it can be used to fingerprint the Nix OS, and to obtain information about available services. Port used with NFS, NIS, or any rpc-based service.

Port 111 was designed by the Sun Microsystems as a component of their Network File System. It is also known as Open Network Computing Remote Procedure Call (ONC RPC). Port 111 is a port mapper with similar functions to Microsoft's port 135 or DCOM DCE.

Security Concerns: Provides rpc port map without auth, has no filtering or logging, rpcinfo probes can quickly find your Unix hosts. Shut down portmapper on any hosts not requiring rpcs, ensure it is blocked at net perimeters.

Trojans that use this port: ADM worm, MscanWorm, Sadmind/IIS Worm

NFS daemon (nfsd.exe) for Omni-NFS/X 6.1 allows remote attackers to cause a denial of service (resource exhaustion) via certain packets, possibly with the Urgent (URG) flag set, to port 111.
References: [CVE-1999-1349]

PORTSERV.exe in Emerson DeltaV and DeltaV Workstations 9.3.1, 10.3.1, 11.3, and 11.3.1 and DeltaV ProEssentials Scientific Graph allows remote attackers to cause a denial of service (daemon crash) via a crafted (1) TCP or (2) UDP packet to port 111.
References: [CVE-2012-1816] [BID-53591] [SECUNIA-49210] [OSVDB-82012]

Vestel TV 42pf9322 is vulnerable to a denial of service. By sending a specially-crafted request containing an overlong string argument to port 111, a remote attacker could exploit this vulnerability to cause the device to malfunction.
References: [XFDB-87101] [BID-62394] [EDB-28271]

MiCOM C264 could allow a remote attacker to execute arbitrary code on the system, caused by an integer overflow in the RPC service. By sending specially-crafted data to port 111, an attacker could overflow a buffer and execute arbitrary code on the system with elevated privileges.
References: [XFDB-111158]

Vulnerability in BrightStor ARCserve Backup, can be exploited and cause a DoS (Denial of Service). The vulnerability is caused due to a NULL pointer dereference error when handling TADDR2UADDR (0x08) request types within the CA Remote Procedure Call Server service (CATIRPC.EXE). This can be exploited to crash the service by sending a specially crafted packet to port 111/UDP.
References: [CVE-2007-0816] [SECUNIA-24009]

The xdr_bytes and xdr_string functions in the GNU C Library (aka glibc or libc6) 2.25 mishandle failures of buffer deserialization, which allows remote attackers to cause a denial of service (virtual memory allocation, or memory consumption if an overcommit setting is not used) via a crafted UDP packet to port 111, a related issue to CVE-2017-8779.
References: [CVE-2017-8804], [BID-98339]

rpcbind through 0.2.4, LIBTIRPC through 1.0.1 and 1.0.2-rc through 1.0.2-rc3, and NTIRPC through 1.4.3 do not consider the maximum RPC data size during memory allocation for XDR strings, which allows remote attackers to cause a denial of service (memory consumption with no subsequent free) via a crafted UDP packet to port 111, aka rpcbomb.
References: [CVE-2017-8779], [BID-98325]
111 tcp,udp Sun Remote Procedure Call (official) Wikipedia
111 tcp trojan ADM worm, MscanWorm Trojans
111 tcp,udp sunrpc portmapper rpcbind SANS
111 tcp,udp applications Portmap Portforward
111 tcp,udp rpcbind portmapper, rpcbind Nmap
111 tcp,udp sunrpc SUN Remote Procedure Call IANA
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Related ports: 135  

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External Resources
SANS Internet Storm Center: port 111

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.

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