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The system must be configured to prevent IP source routing.


Overview

Finding ID Version Rule ID IA Controls Severity
V-4110 WN12-SO-000038 SV-52924r1_rule Low
Description
Configuring the system to disable IP source routing protects against spoofing.
STIG Date
Windows Server 2012 / 2012 R2 Domain Controller Security Technical Implementation Guide 2016-12-19

Details

Check Text ( C-47229r2_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: 2
Fix Text (F-45850r2_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (DisableIPSourceRouting) IP source routing protection level (protects against packet spoofing)" to "Highest protection, source routing is completely disabled".

(See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.)