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18.9.5.5 (L1) Ensure 'Turn On Virtualization Based Security: Credential Guard Configuration' is set to 'Enabled with UEFI lock'
Information
This setting lets users turn on Credential Guard with virtualization-based security to help protect credentials. The 'Enabled with UEFI lock' option ensures that Credential Guard cannot be disabled remotely. In order to disable the feature, you must set the Group Policy to 'Disabled' as well as remove the security functionality from each computer, with a physically present user, in order to clear configuration persisted in UEFI.The recommended state for this setting is: Enabled with UEFI lock
Note: Virtualization Based Security requires a 64-bit version of Windows with Secure Boot enabled, which in turn requires that Windows was installed with a UEFI BIOS configuration, not a Legacy BIOS configuration. In addition, if running Windows on a virtual machine, the hardware-assisted CPU virtualization feature (Intel VT-x or AMD-V) must be exposed by the host to the guest VM.
More information on system requirements for this feature can be found at
Windows Defender Credential Guard Requirements (Windows 10) | Microsoft Docs
Note #2: Credential Guard and Device Guard are not currently supported when using Azure IaaS VMs.
The Enabled with UEFI lock option ensures that Credential Guard cannot be disabled remotely.
Solution
To establish the recommended configuration via GP, set the following UI path to Enabled with UEFI lock :Computer Configuration\Policies\Administrative Templates\System\Device Guard\Turn On Virtualization Based Security: Credential Guard Configuration
Note: This Group Policy path is provided by the Group Policy template DeviceGuard.admx/adml that is included with the Microsoft Windows 10 Release 1511 Administrative Templates (or newer).
Impact:
Note: This setting was moved from the Next Generation (NG) profile to the Level 1 (L1) profile for the Windows 11 Operating System only NG profile settings were isolated from the L1 profile due to potential hardware compatibility issues. The Windows 11 Operating System is dependent on the same hardware as the NG settings, so hardware compatibility is no longer an issue.
Warning: All drivers on the system must be compatible with this feature or the system may crash. Ensure that this policy setting is only deployed to computers which are known to be compatible.
Warning #2: Once this setting is turned on and active, Credential Guard cannot be disabled solely via GPO or any other remote method. After removing the setting from GPO, the features must also be manually disabled
locally at the machine
using the steps provided at this link:
Manage Windows Defender Credential Guard (Windows 10) | Microsoft Docs
See Also
Item Details
Category: SYSTEM AND INFORMATION INTEGRITY
References: 800-53|SI-16, CSCv7|8.3
Plugin: Windows
Control ID: e4c00424ff191ebc57c3cedaf96f1e06db0ead84770e7919b11f24deb218da4d