Title

Windows 10 systems must have Unified Extensible Firmware Interface (UEFI) firmware and be configured to run in UEFI mode, not Legacy BIOS. (Cat II impact)

Discussion

UEFI provides additional security features in comparison to legacy BIOS firmware, including Secure Boot. UEFI is required to support additional security features in Windows 10, including Virtualization Based Security and Credential Guard. Systems with UEFI that are operating in Legacy BIOS mode will not support these security features.

Check Content

For virtual desktop implementations (VDIs) where the virtual desktop instance is deleted or refreshed upon logoff, this is NA. Verify the system firmware is configured to run in UEFI mode, not Legacy BIOS. Run "System Information". Under "System Summary", if "BIOS Mode" does not display "UEFI", this is a finding.

Fix Text

Configure UEFI firmware to run in UEFI mode, not Legacy BIOS mode.

Additional Identifiers

Rule ID: SV-220699r569187_rule

Vulnerability ID: V-220699

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

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