SV-205702r1051071: Windows Server 2019 Kerberos user logon restrictions must be enforced. | Microsoft Windows Server 2019 STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows Server 2019 Kerberos user logon restrictions must be enforced.

Description

Discussion Text

This policy setting determines whether the Kerberos Key Distribution Center (KDC) validates every request for a session ticket against the user rights policy of the target computer. The policy is enabled by default, which is the most secure setting for validating that access to target resources is not circumvented. Satisfies: SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

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

IA Controls

NIST SP 800-53

Not mappedCCI-001942V-93443SV-103529

References

DPMS Target Microsoft Windows Server 2019 DISA DPMS Target Microsoft Windows Server 2019 2907

Checks

DISA STIG (Manual Reference)

This applies to domain controllers. It is NA for other systems.

Verify the following is configured in the Default Domain Policy:

Open "Group Policy Management".

Navigate to "Group Policy Objects" in the Domain being reviewed (Forest >> Domains >> Domain). 

Right-click on the "Default Domain Policy".

Select "Edit".

Navigate to Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Account Policies >> Kerberos Policy.

If the "Enforce user logon restrictions" is not set to "Enabled", this is a finding.

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.windows2019:def:205702
# Windows Server 2019 Kerberos user logon restrictions must be enforced.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Kerberos Policy - Enforce user logon restrictions - Enabled, PA test = -1 OR Other tools test = 1
# wmi57_object (wmi57_test)
function test_1 {
  return ((((Get-CimInstance -Namespace 'root\rsop\computer' -Query 'SELECT setting FROM RSOP_SecuritySettingBoolean WHERE KeyName=''TicketValidateClient''' | Select-Object -First 1) | Select-Object -ExpandProperty 'setting') -eq '-1') -or (((Get-CimInstance -Namespace 'root\rsop\computer' -Query 'SELECT setting FROM RSOP_SecuritySettingBoolean WHERE KeyName=''TicketValidateClient''' | Select-Object -First 1) | Select-Object -ExpandProperty 'setting') -eq '1'))
}

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_2019 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows2019:def:205702
$result = Get-CimInstance -ClassName MSGroupPolicy_ComputerExtension -Namespace "root\rsop\computer" -ErrorAction SilentlyContinue
if ($result -and ($result.TicketValidateClient -eq 1 -or $result.TicketValidateClient -eq -1)) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

Configure the policy value in the Default Domain Policy for Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Account Policies >> Kerberos Policy >> "Enforce user logon restrictions" to "Enabled".