STIGQter: STIG Summary: Microsoft Windows Server 2012/2012 R2 Domain Controller Security Technical Implementation Guide Version: 3 Release: 2 Benchmark Date: 04 May 2021:

The Mapper I/O network protocol (LLTDIO) driver must be disabled.

DISA Rule

SV-226135r569184_rule

Vulnerability Number

V-226135

Group Title

SRG-OS-000095-GPOS-00049

Rule Version

WN12-CC-000001

Severity

CAT II

CCI(s)

• CCI-000381 - The organization configures the information system to provide only essential capabilities.

Weight

10

Fix Recommendation

Configure the policy value for Computer Configuration -> Administrative Templates -> Network -> Link-Layer Topology Discovery -> "Turn on Mapper I/O (LLTDIO) driver" to "Disabled".

Check Contents

If the following registry values do not exist or are not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \Software\Policies\Microsoft\Windows\LLTD\

Value Name: AllowLLTDIOOndomain
Value Name: AllowLLTDIOOnPublicNet
Value Name: EnableLLTDIO
Value Name: ProhibitLLTDIOOnPrivateNet

Type: REG_DWORD
Value: 0

Vulnerability Number

V-226135

Documentable

False

Rule Version

WN12-CC-000001

Severity Override Guidance

If the following registry values do not exist or are not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \Software\Policies\Microsoft\Windows\LLTD\

Value Name: AllowLLTDIOOndomain
Value Name: AllowLLTDIOOnPublicNet
Value Name: EnableLLTDIO
Value Name: ProhibitLLTDIOOnPrivateNet

Type: REG_DWORD
Value: 0

Check Content Reference

M

Target Key

4217

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