Information
IP source routing is a mechanism that allows the sender to determine the IP route that a datagram should take through the network. It is recommended to configure this setting to Not Defined for enterprise environments and to Highest Protection for high security environments to completely disable source routing.
The recommended state for this setting is: Enabled: Highest protection, source routing is completely disabled.
Rationale:
An attacker could use source routed packets to obscure their identity and location. Source routing allows a computer that sends a packet to specify the route that the packet takes.
Impact:
All incoming source routed packets will be dropped.
Solution
To establish the recommended configuration, set the following Device Configuration Policy to Enabled: Highest protection, source routing is completely disabled:
To access the Device Configuration Policy from the Intune Home page:
Click Devices
Click Configuration profiles
Click Create profile
Select the platform (Windows 10 and later)
Select the profile (Administrative Templates)
Click Create
Enter a Name
Click Next
Configure the following Setting
Path: Computer Configuration/MSS (Legacy)
Setting Name: MSS: (DisableIPSourceRouting) IP source routing protection level (protects against packet spoofing)
Configuration: Enabled: Highest protection, source routing is completely disabled
Select OK
Continue through the Wizard to complete the creation of the profile (profile assignments, applicability etc.)
Note: More than one configuration setting from each of the Configuration profiles (ex: Administrative Templates, Custom etc.) can be added to each Device Configuration Policy.
Default Value:
Medium, source routed packets ignored when IP forwarding is enabled.