SV-278218r1268251: Windows Server 2025 must be configured to prevent anonymous users from having the same permissions as the Everyone group. | Microsoft Windows Server 2025 STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows Server 2025 must be configured to prevent anonymous users from having the same permissions as the Everyone group.

Description

Discussion Text

Access by anonymous users must be restricted. If this setting is enabled, anonymous users have the same rights and permissions as the built-in Everyone group. Anonymous users must not have these permissions or rights.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

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:278218
# Windows Server 2025 must be configured to prevent anonymous users from having the same permissions as the Everyone group.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Network access: Let Everyone permissions apply to anonymous users' is set to 'Disabled'
# 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\SYSTEM\CurrentControlSet\Control\Lsa').GetValueKind('EveryoneIncludesAnonymous').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa' -Name 'EveryoneIncludesAnonymous' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'EveryoneIncludesAnonymous') -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.

#
# This script implements the OVAL definition: oval:mil.disa.stig.windows2025:def:278218
$regPath = "HKLM\SYSTEM\CurrentControlSet\Control\Lsa"
$regKey = "EveryoneIncludesAnonymous"
$regValue = 0

if (-not (Test-Path $regPath)) { exit 0 }
$regData = Get-ItemProperty -Path $regPath -Name $regKey -ErrorAction SilentlyContinue
if ($regData -and $regData.$regKey -eq $regValue) { exit 0 }
exit 1

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network access: Let Everyone permissions apply to anonymous users to "Disabled".