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WN25-CC-000050 Windows Server 2025 must be configured to prevent Internet Control Message Protocol (ICMP) redirects from overriding Open Shortest Path First (OSPF)-generated routes.

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 must be configured to prevent Internet Control Message Protocol (ICMP) redirects from overriding Open Shortest Path First (OSPF)-generated routes.

Control

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: EnableICMPRedirect Value Type: REG_DWORD Value: 0x00000000 (0)

Discussion

Allowing ICMP redirect of routes can lead to traffic not being routed properly. When disabled, this forces ICMP to be routed via the shortest path first.

Related controls

CCI-000366

Fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> MSS: (EnableICMPRedirect) Allow ICMP redirects to override OSPF generated routes to "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.