SV-225314r569185: The Mapper I/O network protocol (LLTDIO) driver must be disabled. | Microsoft Windows Server 2012/2012 R2 Member Server STIG SCAP Benchmark

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Assessment Title

Rule Text

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

Description

Discussion Text

The Mapper I/O network protocol (LLTDIO) driver allows the discovery of the connected network and allows various options to be enabled. Disabling this helps protect the system from potentially discovering and connecting to unauthorized devices.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000381CCE-25156-1SV-53072V-15696

References

DPMS Target Microsoft Windows Server 2012-2012 R2 MS DISA DPMS Target Microsoft Windows Server 2012-2012 R2 MS 4214

Checks

DISA STIG (Manual Reference)

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

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.fso.windows:def:4431
# The Mapper I/O network protocol (LLTDIO) driver must be disabled.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies AllowLLTDIOOnDomain value equals 0
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LLTD').GetValueKind('AllowLLTDIOOnDomain').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LLTD' -Name 'AllowLLTDIOOnDomain' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AllowLLTDIOOnDomain') -eq 0))
}
# Verifies AllowLLTDIOOnPublicNet value equals 0
# registry_object (registry_test)
function test_2 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LLTD').GetValueKind('AllowLLTDIOOnPublicNet').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LLTD' -Name 'AllowLLTDIOOnPublicNet' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AllowLLTDIOOnPublicNet') -eq 0))
}
# Verifies EnableLLTDIO value equals 0
# registry_object (registry_test)
function test_3 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LLTD').GetValueKind('EnableLLTDIO').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LLTD' -Name 'EnableLLTDIO' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'EnableLLTDIO') -eq 0))
}
# Verifies ProhibitLLTDIOOnPrivateNet value equals 0
# registry_object (registry_test)
function test_4 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LLTD').GetValueKind('ProhibitLLTDIOOnPrivateNet').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\LLTD' -Name 'ProhibitLLTDIOOnPrivateNet' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'ProhibitLLTDIOOnPrivateNet') -eq 0))
}

if ((test_1 -and test_2 -and test_3 -and test_4)) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_windows_2012_and_2012_r2_ms target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:4431
$compliant = (Get-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\LLTD' -ErrorAction SilentlyContinue -Name 'AllowLLTDIOOnDomain' -ValueOnly).Property | Where-Object { $_ -eq 0 } &&
(Get-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\LLTD' -ErrorAction SilentlyContinue -Name 'AllowLLTDIOOnPublicNet' -ValueOnly).Property | Where-Object { $_ -eq 0 } &&
(Get-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\LLTD' -ErrorAction SilentlyContinue -Name 'EnableLLTDIO' -ValueOnly).Property | Where-Object { $_ -eq 0 } &&
(Get-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\LLTD' -ErrorAction SilentlyContinue -Name 'ProhibitLLTDIOOnPrivateNet' -ValueOnly).Property | Where-Object { $_ -eq 0 }
if ($compliant) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

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