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

From Windows 8/8.1 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000381

SV-48235r2_rule The Mapper I/O network protocol (LLTDIO) driver must be disabled.

Vulnerability discussion

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.

Check content

If the following registry values do not exist or are not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Subkey: \Software\Policies\Microsoft\Windows\LLTD\ Value Name: AllowLLTDIOOndomain Value Name: AllowLLTDIOOnPublicNet Value Name: EnableLLTDIO Value Name: ProhibitLLTDIOOnPrivateNet Type: REG_DWORD Value: 0

Fix text

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

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