What is NetBIOS SSN used for?
| Name: | netbios-ssn |
|---|---|
| Purpose: | NETBIOS Session Service |
| Description: | TCP NetBIOS connections are made over this port, usually with Windows machines but also with any other system running Samba (SMB). These TCP connections form “NetBIOS sessions” to support connection oriented file sharing activities. |
| Related Ports: | 137, 138, 445 |
What is Microsoft Windows NetBIOS SSN?
NetBIOS is a service which allows communication between applications such as a printer or other computer in Ethernet or token ring network via NetBIOS name. NetBIOS name is 16 digits long character assign to a computer in the workgroup by WINS for name resolution of an IP address into NETBIOS name.
Is NetBIOS insecure?
They are insecure and should not be used under any circumstances. Disable NetBIOS over TCP/IP.
What uses NetBIOS?
NetBIOS stands for Network Basic Input Output System. It Allows computer communication over a LAN and allows them to share files and printers. NetBIOS names are used to identify network devices over TCP/IP (Windows).
What is the difference between NetBIOS and DNS?
As has been shown above the main difference between DNS and NetBIOS is the availability of DNS being only available when there is a connection to the internet and the name is registered in the computer. NetBIOS on the other hand is always available to the machines connecting directly to it.
What service is NetBIOS SSN?
NetBIOS provides three distinct services: Name service (NetBIOS-NS) for name registration and resolution. Datagram distribution service (NetBIOS-DGM) for connectionless communication. Session service (NetBIOS-SSN) for connection-oriented communication.
Should I disable port 135?
Disabling TCP port 135 will NOT affect Local DCOM/Raw RPC server component because they do not need network. Disabling TCP port 135 will only affect some client machine which directly use DCOM remote activation (i.e. VB CreateObject(“Excel.
Should I close port 445?
We also recommend blocking port 445 on internal firewalls to segment your network – this will prevent internal spreading of the ransomware. Note that blocking TCP 445 will prevent file and printer sharing – if this is required for business, you may need to leave the port open on some internal firewalls.
What will happen if I disable NetBIOS?
One of the unexpected consequences of disabling NetBIOS completely on your network is how this affects trusts between forests. So if you disable NETBIOS on your domain controllers, you won’t be able to establish a forest trust between two Windows Server 2003 forests.
How do I disable NetBIOS SSN?
Navigate to Administrative Tools > Services, right-click TCP/IP NETBIOS Helper, and click Stop. Right-click TCP/IP NETBIOS Helper, click Properties, and in the Startup type list, select Disabled. Click OK.
Is it safe to disable NetBIOS?
There are many security concerns with NetBIOS; and disabling its support on your network and devices is strongly recommended. Disabling the use and support of NetBIOS can help to mitigate an attacker’s ability to: poison and spoof responses, obtain a user’s hashed credentials, inspect web traffic, etc.
Why are ports 137 and 139 blocked for NetBIOS?
Hence by blocking port 137 and 139 admin has added a security level that will prevent NetBIOS session service as well as NetBIOS name service for NetBIOS enumeration. Mainly in many organization, port series from 135 to 139 are blocked in the network for security reasons, therefore port 445 is used for sharing data in the network.
What is the purpose of the NetBIOS protocol?
NetBIOS serves as an abstraction layer in this arrangement. The NetBIOS protocol is used to communicate a considerable amount of information about the status of machines within the network, in particular the nature of processes and sessions running at this layer.
How to disable NetBIOS on a specific client?
You can disable NetBIOS manually on the specific client. You can disable NetBIOS for the specific network adapter in the registry as well. Each network adapter has a separate branch in HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\NetBT\\Parameters\\Interfaces containing its TCPIP_GUID.
Which is the scanner module in NetBIOS Metasploit?
Scanner NetBIOS Auxiliary Modules. nbname. The nbname auxiliary module scans a range of hosts and determines their hostnames via NetBIOS. To configure the module, we set the RHOSTS and THREADS values then let it run. nbname_probe. Note: The nbname_probe module is no longer in the Metasploit framework.