The system must be configured to prevent IP source routing.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-4110	WN08-SO-000038	SV-48122r1_rule		Low

Description
Configuring the system to disable IP source routing protects against spoofing.

STIG	Date
Windows 8/8.1 Security Technical Implementation Guide	2018-02-12

Details

Check Text ( C-44848r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.) Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. (See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.) If the value for "MSS: (DisableIPSourceRouting) IP source routing protection level (protects against packet spoofing)" is not set to "Highest protection, source routing is completely disabled", this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\Tcpip\Parameters\ Value Name: DisableIPSourceRouting Value Type: REG_DWORD Value: 2

Check Text ( C-44848r1_chk )

Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.)
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

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

If the value for "MSS: (DisableIPSourceRouting) IP source routing protection level (protects against packet spoofing)" is not set to "Highest protection, source routing is completely disabled", this is a finding.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \System\CurrentControlSet\Services\Tcpip\Parameters\

Value Name: DisableIPSourceRouting

Value Type: REG_DWORD
Value: 2

Fix Text (F-41259r1_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".