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WN11-CC-000025 The system must be configured to prevent IP source routing.

DISA STIG library V2R11
All changes in this version
first version loaded CAT II

Maps to CM-6 via CCI-000366

Title

The system must be configured to prevent IP source routing.

Control

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\Tcpip\Parameters\ Value Name: DisableIPSourceRouting Value Type: REG_DWORD Value: 2

Discussion

Configuring the system to disable IP source routing protects against spoofing.

Related controls

CCI-000366

Fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> "MSS: (DisableIPSourceRouting) IP source routing protection level (protects against packet spoofing)" to "Highest protection, source routing is completely disabled". This policy setting requires the installation of the MSS-Legacy custom templates included with the STIG package. "MSS-Legacy.admx" and "MSS-Legacy.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.