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


Overview

Finding ID Version Rule ID IA Controls Severity
V-93235 WN19-CC-000040 SV-103323r1_rule Low
Description
Configuring the system to disable IP source routing protects against spoofing.
STIG Date
Windows Server 2019 Security Technical Implementation Guide 2020-06-15

Details

Check Text ( C-92553r1_chk )
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 (F-99481r1_fix)
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.