Port 135 Details
known port assignments and vulnerabilities
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|135||tcp,udp||loc-srv||Remote Procedure Call (RPC) port 135 is used in client/server applications (might be on a single machine) such as Exchange clients, the recently exploited messenger service, as well as other Windows NT/2K/XP software. If you have remote users who VPN into your network, you might need to tướng open this port on the firewall to tướng allow access to tướng the Exchange server.
There is a RPC (a RPC's Endpoint Mapper component) vulnerability in Windows NT where a malformed request to tướng port 135 could cause denial of service (DoS). RPC contains a flaw that causes it to tướng fail upon receipt of a request that contains a particular type of malformed data. To restore normal functionality victim has to tướng reboot the system. Alternatively, you can upgrade/patch your OS (there is patch downloadable from Microsoft), or you can close port 135.
Port 135 is used by Messenger Service (not MSN Messenger) and exploited in popup net send messenger spam [MSKB 330904]. To stop the popups you'd need to tướng filter port 135 at the firewall level or stop the messenger service. The service uses all the following ports: 135/tcp, 135/udp, 137/udp 138/udp, 139/tcp, 445/tcp.
MS Security Bulletin [MS03-026] outlines another critical Buffer Overrun RPC vulnerability that can be exploited via ports 135, 139, 445, 593 (or any other specifically configured RPC port). You should filter the above mentioned ports at the firewall level and not allow RPC over an unsecure network, such as the Internet.
W32.Blaster.Worm [Symantec-2003-081113-0229-99] - a widely spread worm that exploits the DCOM RPC vulnerability described above (MS Security Bulletin [MS03-026]). The worm allows remote access to tướng an infected computer via ports 4444/tcp and 69/UDP, and spreads through port 135/tcp. To avoid being infected consider closing those ports.
Port is also used by Messenger Service (not MSN Messenger) and exploited in popup net send messenger spam [MSKB 330904]. To stop the popups you'd need to tướng filter port 135 at the firewall level or stop the messenger service. The service uses all the following ports: 135/tcp, 135/udp, 137/udp 138/udp, 139/tcp, 445/tcp.
W32.Reatle.E@mm [Symantec-2005-080215-5809-99] - a mass-mailing worm that opens a backdoor and also spreads by exploiting the MS DCOM RPC Vulnerability [MS03-026] on port 135/tcp. It uses its own SMTP engine to tướng gmail itself to tướng gathered gmail addresses. Opens an FTP server on port 1155/tcp. Opens a proxy server on port 2005/tcp. It also attempts to tướng perform denial of service (DDoS) attack agains known security websites on port 1052/tcp. Note: port 1052 corresponds to tướng the dynamic DNS service.
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A vulnerability has been identified in LOGO!8 BM (incl. SIPLUS variants) (All versions). The vulnerability could lead to tướng an attacker reading and modifying the device configuration and obtain project files from affected devices. The security vulnerability could be exploited by an unauthenticated attacker with network access to tướng port 135/tcp. No user interaction is required to tướng exploit this security vulnerability. The vulnerability impacts confidentiality, integrity, and availability of the device. At the time of advisory publication no public exploitation of this security vulnerability was known.
|135||tcp,udp||DCE endpoint resolution (official)||Wikipedia|
|135||tcp,udp||Microsoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service, used to tướng remotely manage services including DHCP server, DNS server and WINS (unofficial)||Wikipedia|
|135||tcp||loc-srv||NCS local location broker||SANS|
|135||tcp,udp||msrpc||Microsoft RPC services||Nmap|
|135||tcp,udp||loc-srv||NCS Location Service||Neophasis|
|135||tcp,udp||epmap||DCE endpoint resolution||IANA|
Related ports: 111 137 138 139 445
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SANS Internet Storm Center: port 135
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 mạng internet protocol resources, including the registration of commonly used port numbers for well-known mạng internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
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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 tướng applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to tướng the application that received the message to tướng 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 tướng waiting for delayed data.
When troubleshooting unknown open ports, it is useful to tướng find exactly what services/processes are listening to tướng 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 tướng rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.
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