Detections
Analytics
18.9.37.2 Ensure 'Restrict Unauthenticated RPC clients' is set to 'Enabled: Authenticated'
Information
This policy setting controls how the RPC server runtime handles unauthenticated RPC clients connecting to RPC servers.This policy setting impacts all RPC applications. In a domain environment this policy setting should be used with caution as it can impact a wide range of functionality including group policy processing itself. Reverting a change to this policy setting can require manual intervention on each affected machine. This policy setting should never be applied to a Domain Controller.
A client will be considered an authenticated client if it uses a named pipe to communicate with the server or if it uses RPC Security. RPC Interfaces that have specifically requested to be accessible by unauthenticated clients may be exempt from this restriction, depending on the selected value for this policy setting.
-- 'None' allows all RPC clients to connect to RPC Servers running on the machine on which the policy setting is applied.
-- 'Authenticated' allows only authenticated RPC Clients (per the definition above) to connect to RPC Servers running on the machine on which the policy setting is applied. Exemptions are granted to interfaces that have requested them.
-- 'Authenticated without exceptions' allows only authenticated RPC Clients (per the definition above) to connect to RPC Servers running on the machine on which the policy setting is applied. No exceptions are allowed. This value has the potential to cause serious problems and is not recommended.
Note: This policy setting will not be applied until the system is rebooted.
The recommended state for this setting is: Enabled: Authenticated.
Rationale:
Unauthenticated RPC communication can create a security vulnerability.
Impact:
None - this is the default behavior.
Solution
To establish the recommended configuration, set the following Device Configuration Policy to Enabled: Authenticated: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/System/Remote Procedure Call
Setting Name: Restrict Unauthenticated RPC clients
Configuration: Enabled: Authenticated
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:
Enabled: Authenticated. (Only authenticated RPC clients are allowed to connect to RPC servers running on the machine. Exemptions are granted to interfaces that have requested them.)
See Also
Item Details
Category: SYSTEM AND INFORMATION INTEGRITY
References: 800-53|SI-4, CSCv7|9.2
Plugin: Windows
Control ID: 3c6aa0d03dd76eeb42a1b1b847cae64fbc5bd34959e9cf87097c6bb1e3ea2cbb