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WN25-CC-000030 Windows Server 2025 Internet Protocol version 6 (IPv6) source routing must be configured to the highest protection level to prevent IP source routing.

DISA STIG library V1R4
All changes in this version
first version loaded CAT III

Maps to CM-6 via CCI-000366

Title

Windows Server 2025 Internet Protocol version 6 (IPv6) source routing must be configured to the highest protection level to prevent IP source routing.

Control

Verify the registry value below: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\ Value Name: DisableIPSourceRouting Type: REG_DWORD Value: 0x00000002 (2) If the registry value does not exist or is not configured as specified, this is a finding.

Discussion

Configuring the system to disable IPv6 source routing protects against spoofing.

Related controls

CCI-000366

Fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> MSS: (DisableIPSourceRouting IPv6) IP source routing protection level (protects against packet spoofing) to "Enabled" with "Highest protection, source routing is completely disabled" selected. 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.