Microsoft Windows 11

IPv6 source routing must be configured to highest protection

STIG ID: WN11-CC-000020 | SRG: SRG-OS-000480-GPOS-00227 | Severity: Medium | CCI: CCI-000366 | Vulnerability ID: V-253353

Description

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

Check

C-56806r829141_chk

If the following registry value does not exist or is not configured as specified, this is a finding:Registry Hive: HKEY_LOCAL_MACHINERegistry Path: \SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\Value Name: DisableIpSourceRoutingValue Type: REG_DWORDValue: 2

Fix

F-56756r829142_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 "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.