Detections
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18.8.5.5 (NG) Ensure 'Turn On Virtualization Based Security: Credential Guard Configuration' is set to 'Enabled with UEFI lock'

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This audit has been deprecated and will be removed in a future update.

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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 this link:
Windows Defender Credential Guard Requirements (Windows 10) | Microsoft Docs
Rationale:
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
Impact:
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
Default Value:
Disabled.
CIS Controls:
Version 6
16.14 Encrypt/Hash All Authentication Files And Monitor Their Access
Verify that all authentication files are encrypted or hashed and that these files cannot be accessed without root or administrator privileges. Audit all access to password files in the system.
Version 7
16.4 Encrypt or Hash all Authentication Credentials
Encrypt or hash with a salt all authentication credentials when stored.

See Also

https://workbench.cisecurity.org/files/2288

Item Details

References: CSCv6|16.14, CSCv7|16.4

Plugin: Windows

Control ID: da182dca701d58821dd1be1a7277301eeffd45505b83ffb2f098d2f88d8c40da