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V-205859

CAT III (Low)

Windows Server 2019 source routing must be configured to the highest protection level to prevent Internet Protocol (IP) source routing.

Rule ID

SV-205859r991589_rule

STIG

Microsoft Windows Server 2019 Security Technical Implementation Guide

Version

V3R8

CCIs

CCI-000366

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.