The ESXi host DCUI.Access list must be verified.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-258751	SRG-OS-000480-VMM-002000	ESXI-80-000189	SV-258751r933314_rule	2023-10-11	1

Description
Lockdown mode disables direct host access, requiring that administrators manage hosts from vCenter Server. However, if a host becomes isolated from vCenter, the administrator is locked out and can no longer manage the host. The "DCUI.Access" advanced setting allows specified users to exit lockdown mode in such a scenario. If the Direct Console User Interface (DCUI) is running in strict lockdown mode, this setting is ineffective.

Description

Lockdown mode disables direct host access, requiring that administrators manage hosts from vCenter Server. However, if a host becomes isolated from vCenter, the administrator is locked out and can no longer manage the host. The "DCUI.Access" advanced setting allows specified users to exit lockdown mode in such a scenario. If the Direct Console User Interface (DCUI) is running in strict lockdown mode, this setting is ineffective.

ℹ️ Check
For environments that do not use vCenter server to manage ESXi, this is not applicable. From the vSphere Client, go to Hosts and Clusters. Select the ESXi Host >> Configure >> System >> Advanced System Settings. Select the "DCUI.Access" value and verify only the root user is listed. or From a PowerCLI command prompt while connected to the ESXi host, run the following command: Get-VMHost \| Get-AdvancedSetting -Name DCUI.Access and verify it is set to root. If the "DCUI.Access" is not restricted to "root", this is a finding. Note: This list is only for local user accounts and should only contain the root user.

ℹ️ Check

For environments that do not use vCenter server to manage ESXi, this is not applicable. From the vSphere Client, go to Hosts and Clusters. Select the ESXi Host >> Configure >> System >> Advanced System Settings. Select the "DCUI.Access" value and verify only the root user is listed. or From a PowerCLI command prompt while connected to the ESXi host, run the following command: Get-VMHost | Get-AdvancedSetting -Name DCUI.Access and verify it is set to root. If the "DCUI.Access" is not restricted to "root", this is a finding. Note: This list is only for local user accounts and should only contain the root user.

✔️ Fix
From the vSphere Client, go to Hosts and Clusters. Select the ESXi Host >> Configure >> System >> Advanced System Settings. Click "Edit". Select the "DCUI.Access" value and configure it to "root". or From a PowerCLI command prompt while connected to the ESXi host, run the following command: Get-VMHost \| Get-AdvancedSetting -Name DCUI.Access \| Set-AdvancedSetting -Value "root"