Windows Server 2019 User Account Control must be configured to detect application installations and prompt for elevation.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-205718	WN19-SO-000420	SV-205718r569188_rule		Medium

Description
User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting requires Windows to respond to application installation requests by prompting for credentials.

STIG	Date
Microsoft Windows Server 2019 Security Technical Implementation Guide	2020-10-26

Details

Check Text ( C-5983r355072_chk )
UAC requirements are NA for Server Core installations (this is the default installation option for Windows Server 2019 versus Server with Desktop Experience). 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: EnableInstallerDetection Value Type: REG_DWORD Value: 0x00000001 (1)

Check Text ( C-5983r355072_chk )

UAC requirements are NA for Server Core installations (this is the default installation option for Windows Server 2019 versus Server with Desktop Experience).

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: EnableInstallerDetection

Value Type: REG_DWORD
Value: 0x00000001 (1)

Fix Text (F-5983r355073_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Detect application installations and prompt for elevation" to "Enabled".