Set NetBIOS Node Type (KB160177)

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How to Secure Against NetBIOS Name Service (NBT-NS) Poisoning Attacks

Since it is far easier for an attacker to spoof a broadcast-based name request than it is to impersonate a WINS server, one of the easiest ways to secure against this vulnerability is to turn off NetBIOS broadcast-based name resolution. To do this, simply add a registry value in the following registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NetBT\Parameters
In this registry key, create a DWORD value called: NodeType
Then, set the NodeType value to 2

This secures the machine by telling Windows to treat itself as a NetBIOS P-node (point-to-point system). These systems will only resolve NBT-NS queries using WINS – no broadcasts will take place. Success!

For more information on the NodeType registry value, see: https://support.microsoft.com/kb/160177

Administrative Templates (Computers)

Files

  • set-netbios-node-type-kb160177.admx

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