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Check: WN11-CC-000020

Microsoft Windows 11 STIG: WN11-CC-000020 (in versions v2 r2 through v1 r1)

Title

IPv6 source routing must be configured to highest protection. (Cat II impact)

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 Value Type: REG_DWORD Value: 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 "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.

Additional Identifiers

Rule ID: SV-253353r991589_rule

Vulnerability ID: V-253353

Group Title: SRG-OS-000480-GPOS-00227

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CCIs

CCIs tied to check.

Number	Definition
CCI-000366	Implement the security configuration settings.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
CM-6	Configuration Settings