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

From Windows Server 2016 Security Technical Implementation Guide

Associated with: CCI-000366

SV-88151r1_rule Internet Protocol version 6 (IPv6) source routing must be configured to the highest protection level to prevent IP source routing.

Vulnerability discussion

Configuring the system to disable IPv6 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\Tcpip6\Parameters\ Value Name: DisableIPSourceRouting Type: REG_DWORD Value: 0x00000002 (2)

Fix text

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.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.