The system must be configured to ignore NetBIOS name release requests except from WINS servers.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
WN12-SO-000043	WN12-SO-000043	WN12-SO-000043_rule		Low

Description
Configuring the system to ignore name release requests, except from WINS servers, prevents a denial of service (DoS) attack. The DoS consists of sending a NetBIOS name release request to the server for each entry in the server's cache, causing a response delay in the normal operation of the servers WINS resolution capability.

STIG	Date
Microsoft Windows Server 2012 Domain Controller Security Technical Implementation Guide	2013-07-25

Details

Check Text ( C-WN12-SO-000043_chk )
If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\Netbt\Parameters\ Value Name: NoNameReleaseOnDemand Value Type: REG_DWORD Value: 1

Fix Text (F-WN12-SO-000043_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (NoNameReleaseOnDemand) Allow computer to ignore NetBIOS name release requests except from WINS servers" to "Enabled". (See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.)

Fix Text (F-WN12-SO-000043_fix)

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (NoNameReleaseOnDemand) Allow computer to ignore NetBIOS name release requests except from WINS servers" to "Enabled".

(See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.)