User Account Control approval mode for the built-in Administrator must be enabled.

From Windows Server 2016 Security Technical Implementation Guide

Associated with: CCI-002038

SV-88371r1_rule User Account Control approval mode for the built-in Administrator must be enabled.

Vulnerability discussion

User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting configures the built-in Administrator account so that it runs in Admin Approval Mode.Satisfies: SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00156

Check content

UAC requirements are NA for Server Core installations (this is the default installation option for Windows Server 2016 versus Server with Desktop Experience) as well as Nano Server. If the following registry value does not exist or is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ Value Name: FilterAdministratorToken Value Type: REG_DWORD Value: 0x00000001 (1)

Fix text

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Admin Approval Mode for the Built-in Administrator account" to "Enabled".

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