Named pipes that can be accessed anonymously must be configured with limited values on domain controllers.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3338	3.063-DC	SV-46295r1_rule		High

Description
This is a Category 1 finding due to the potential for gaining unauthorized system access. Pipes are internal system communications processes. They are identified internally by ID numbers that vary between systems. To make access to these processes easier, these pipes are given names that do not vary between systems. This setting controls which of these pipes may be accessed anonymously.

STIG	Date
Windows Server 2008 R2 Domain Controller Security Technical Implementation Guide	2019-06-18

Details

Check Text ( C-43442r2_chk )
Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for "Network access: Named pipes that can be accessed anonymously" contains entries other than "netlogon"," samr", and "lsarpc", this is a finding. The default configuration of systems promoted to domain controllers may include a blank entry in the first line prior to "netlogon", "samr", and "lsarpc". This will appear in the registry as a blank entry when viewing the registry key summary; however the value data for "NullSessionPipes" will contain the default entries. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\LanManServer\Parameters\ Value Name: NullSessionPipes Value Type: REG_MULTI_SZ Value: netlogon, samr, lsarpc Legitimate applications may add entries to this registry value. If an application requires these entries to function properly and is documented with the IAO, this would not be a finding. Documentation must contain supporting information from the vendor's instructions.

Check Text ( C-43442r2_chk )

Analyze the system using the Security Configuration and Analysis snap-in.
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

If the value for "Network access: Named pipes that can be accessed anonymously" contains entries other than "netlogon"," samr", and "lsarpc", this is a finding.

The default configuration of systems promoted to domain controllers may include a blank entry in the first line prior to "netlogon", "samr", and "lsarpc". This will appear in the registry as a blank entry when viewing the registry key summary; however the value data for "NullSessionPipes" will contain the default entries.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \System\CurrentControlSet\Services\LanManServer\Parameters\

Value Name: NullSessionPipes

Value Type: REG_MULTI_SZ
Value: netlogon, samr, lsarpc

Legitimate applications may add entries to this registry value. If an application requires these entries to function properly and is documented with the IAO, this would not be a finding. Documentation must contain supporting information from the vendor's instructions.

Fix Text (F-39590r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Network access: Named pipes that can be accessed anonymously" to only include "netlogon, samr, lsarpc".