SV-278233r1182193: Windows Server 2025 UIAccess applications must not be allowed to prompt for elevation without using the secure desktop. | Microsoft Windows Server 2025 STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows Server 2025 UIAccess applications must not be allowed to prompt for elevation without using the secure desktop.

Description

Discussion Text

User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting prevents User Interface Accessibility programs from disabling the secure desktop for elevation prompts.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001084

References

DPMS Target Microsoft Windows Server 2025 DISA DPMS Target Microsoft Windows Server 2025 5719

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.windows2025:def:278233
# Windows Server 2025 UIAccess applications must not be allowed to prompt for elevation without using the secure desktop.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# UIAccess applications is not allowed to prompt for elevation without using the secure desktop
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System').GetValueKind('EnableUIADesktopToggle').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System' -Name 'EnableUIADesktopToggle' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'EnableUIADesktopToggle') -eq 0))
}

if (test_1) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_windows_server_2025 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows2025:def:278233
$registryPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System"
$registryKey = "EnableUIADesktopToggle"
$expectedValue = 0

if (-not (Test-Path $registryPath)) { exit 0 }
if ((Get-ItemProperty -Path $registryPath -Name $registryKey -ErrorAction SilentlyContinue).$registryKey -eq $expectedValue) { Write-Output "PASS"; exit 0 }
Write-Output "FAIL"; exit 1

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> User Account Control: Allow UIAccess applications to prompt for elevation without using the secure desktop to "Disabled".