Detections
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18.10.44.5 Ensure 'Configure Microsoft Defender Application Guard clipboard settings: Clipboard behavior setting' is set to 'Enabled: Enable clipboard operation from an isolated session to the host' - Enabled: Enable clipboard operation from an isolated session to the host

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Information

This policy setting allows you to decide how the clipboard behaves while in Microsoft Defender Application Guard.

The recommended state for this setting is: Enabled: Enable clipboard operation from an isolated session to the host.

Note: Microsoft Defender Application Guard requires a 64-bit version of Windows and a CPU supporting hardware-assisted CPU virtualization (Intel VT-x or AMD-V). This feature is not officially supported on virtual hardware, although it can work on VMs (especially for testing) provided that the hardware-assisted CPU virtualization feature is exposed by the host to the guest VM.

More information on system requirements for this feature can be found at System requirements for Microsoft Defender Application Guard (Windows 10) | Microsoft Docs

Note #2: Credential Guard and Device Guard are not currently supported when using Azure IaaS VMs.

Rationale:

The primary purpose of Microsoft Defender Application Guard is to present a 'sandboxed container' for visiting untrusted websites. If the host clipboard is made available to Microsoft Defender Application Guard, a compromised Microsoft Defender Application Guard session will have access to its content, potentially exposing sensitive information to a malicious website or application. However, the risk is reduced if the Microsoft Defender Application Guard clipboard is made accessible to the host, and indeed that functionality may often be necessary from an operational standpoint.

Impact:

Microsoft Defender Application Guard sessions will not be able to access the host device's clipboard, however the host device will be able to access the Microsoft Defender Application Guard session clipboard.

Solution

To establish the recommended configuration via GP, set the following UI path to Enabled: Enable clipboard operation from an isolated session to the host

Computer Configuration\Policies\Administrative Templates\Windows Components\Microsoft Defender Application Guard\Configure Microsoft Defender Application Guard clipboard settings: Clipboard behavior setting

Note: This Group Policy path may not exist by default. It is provided by the Group Policy template AppHVSI.admx/adml that is included with the Microsoft Windows 10 Release 1703 Administrative Templates (or newer).

Note #2: In older Microsoft Windows Administrative Templates, this setting was initially named Configure Windows Defender Application Guard clipboard settings: Clipboard behavior setting, but it was renamed to Configure Microsoft Defender Application Guard clipboard settings: Clipboard behavior setting starting with the Windows 10 Release 2004 Administrative Templates.

Default Value:

Disabled. (All clipboard functionality is turned off in Microsoft Defender Application Guard.)

See Also

https://workbench.cisecurity.org/benchmarks/13204

Item Details

References: CSCv7|8.3

Plugin: Windows

Control ID: 28bc047a72c30253a421c075b033c84e8c34a9756c87d6bf98b9abcab5482183