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CCE
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CCE-46911-4

Platform: win2016Date: (C)2017-08-03   (M)2017-10-16



"User Account Control: Allow UIAccess applications to prompt for elevation without using the secure desktop" This policy setting controls whether User Interface Accessibility (UIAccess or UIA) programs can automatically disable the secure desktop for elevation prompts used by a standard user. - Enabled: UIA programs, including Windows Remote Assistance, automatically disable the secure desktop for elevation prompts. If you do not disable the "User Account Control: Switch to the secure desktop when prompting for elevation" policy setting, the prompts appear on the interactive user's desktop instead of the secure desktop. - Disabled: (Default) The secure desktop can be disabled only by the user of the interactive desktop or by disabling the "User Account Control: Switch to the secure desktop when prompting for elevation" policy setting. Vulnerability: One of the risks that the UAC feature introduced with Windows Vista is trying to mitigate is that of malicious software running under elevated credentials without the user or administrator being aware of its activity. This setting allows the administrator to perform operations that require elevated privileges while connected via Remote Assistance. This increases security in that organizations can use UAC even when end user support is provided remotely. However, it also reduces security by adding the risk that an administrator might allow an unprivileged user to share elevated privileges for an application that the administrator needs to use during the Remote Desktop session. Counter Measure: To reduce the risk of a user gaining elevated privileges disable this setting. Potential Impact: If you enable this setting, ("User Account Control: Allow UIAccess applications to prompt for elevation without using the secure desktop"), requests for elevation are automatically sent to the interactive desktop (not the secure desktop) and also appear on the remote administrator's view of the desktop during a Windows Remote Assistance session, and the remote administrator is able to provide the appropriate credentials for elevation. This setting does not change the behavior of the UAC elevation prompt for administrators.


Parameter: EnableUIADesktopToggle


Technical Mechanism: Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options (2) REG: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System!EnableUIADesktopToggle

References:

Resource IdReference
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:40201


OVAL    1
oval:org.secpod.oval:def:40201
XCCDF    3
xccdf_org.secpod_benchmark_general_Windows_Server_2016
xccdf_org.secpod_benchmark_NIST_800_171_R1_Windows_Server_2016
xccdf_org.secpod_benchmark_PCI_3_2_Windows_Server_2016

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