Source routing must be configured to the highest protection level to prevent Internet Protocol (IP) source routing.

From Windows Server 2016 Security Technical Implementation Guide

Associated with: CCI-000366

SV-88153r1_rule Source routing must be configured to the highest protection level to prevent Internet Protocol (IP) source routing.

Vulnerability discussion

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

Check content

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: 0x00000002 (2)

Fix text

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> "MSS: (DisableIPSourceRouting) 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.

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