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Table 22. System Security details (continued)

Option

UEFI Variable Access

In-Band Manageability Interface

SMM Security Migration

Secure Boot

Secure Boot Policy

Secure Boot Mode

Secure Boot Policy Summary

Secure Boot Custom Policy

Settings

Description

Provides varying degrees of securing UEFI variables. When set to Standard (the

default), UEFI variables are accessible in the operating system per the UEFI

specification. When set to Controlled, selected UEFI variables are protected in the

environment and new UEFI boot entries are forced to be at the end of the current boot

order.

When set to Disabled , this setting hides the Management Engine's (ME), HECI devices,

and the system's IPMI devices from the operating system. This prevents the operating

system from changing the ME power capping settings, and blocks access to all in-

band management tools. All management should be managed through out-of-band. This

option is set to Enabled by default.

NOTE:

BIOS update requires HECI devices to be operational and DUP updates

require IPMI interface to be operational. This setting needs to be set to Enabled to

avoid updating errors.

Enables or disables the UEFI SMM security migration protections. It is enabled for

Windows 2022 support.

Enables Secure Boot, where the BIOS authenticates each pre-boot image by using the

certificates in the Secure Boot Policy. Secure Boot is set to Disabled by default.

When Secure Boot policy is set to Standard, the BIOS uses the system manufacturer's

key and certificates to authenticate pre-boot images. When Secure Boot policy is set to

Custom, the BIOS uses the user-defined key and certificates. Secure Boot policy is set

to Standard by default.

Configures how the BIOS uses the Secure Boot Policy Objects (PK, KEK, db, dbx).

If the current mode is set to Deployed Mode, the available options are User Mode and

Deployed Mode. If the current mode is set to User Mode, the available options are

User Mode, Audit Mode, and Deployed Mode.

Table 23. Secure Boot Mode

Options

Descriptions

User Mode

In User Mode, PK must be installed, and BIOS performs signature

verification on programmatic attempts to update policy objects.

The BIOS allows unauthenticated programmatic transitions between

modes.

Audit mode In Audit Mode, PK is not present. BIOS does not authenticate

programmatic update to the policy objects and transitions between

modes. The BIOS performs a signature verification on pre-boot images

and logs the results in the image Execution Information Table, but

executes the images whether they pass or fail verification.

Audit Mode is useful for programmatic determination of a working set

of policy objects.

Deployed

Deployed Mode is the most secure mode. In Deployed Mode, PK

Mode

must be installed and the BIOS performs signature verification on

programmatic attempts to update policy objects.

Deployed Mode restricts the programmatic mode transitions.

Specifies the list of certificates and hashes that secure boot uses to authenticate

images.

Configures the Secure Boot Custom Policy. To enable this option, set the Secure Boot

Policy to Custom option.

Pre-operating system management applications