Alternate operating systems must not be permitted on the same system.

From Windows 8/8.1 Security Technical Implementation Guide

Part of Booting into Multiple Operating Systems

Associated with: CCI-000366

SV-48037r1_rule Alternate operating systems must not be permitted on the same system.

Vulnerability discussion

Allowing other operating systems to run on a secure system may allow security to be circumvented.

Check content

Verify the local system boots directly into Windows. Open Control Panel. Select "System". Select the "Advanced System Settings" link. Select the "Advanced" tab. Click the Startup and Recovery "Settings" button. If the drop-down list box "Default operating system:" shows any operating system other than Windows 8, this is a finding.

Fix text

Ensure Windows 8 is the only operating system on a device. Remove alternate operating systems.

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