SV-285320r1268251: The Windows Server 2025 OpenSSH configuration file must conform to minimum requirements. | Microsoft Windows Server 2025 STIG SCAP Benchmark

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Assessment Title

Rule Text

The Windows Server 2025 OpenSSH configuration file must conform to minimum requirements.

Description

Discussion Text

Service configuration files enable or disable features of their respective services, which if configured incorrectly can lead to insecure and vulnerable configurations. Therefore, service configuration files must be owned by the correct group to prevent unauthorized changes.

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.

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:285320
$filePath = "$env:ProgramData\ssh\sshd_config"
if (-Not (Test-Path $filePath)) { Write-Output "PASS"; Exit 0 }
$acl = Get-Acl $filePath
$expectedRights = [System.Security.AccessControl.FileSystemRights]::FullControl
$expectedAccessControlType = 'Allow'
$groups = @("NT AUTHORITY\SYSTEM", "BUILTIN\Administrators", "NT AUTHORITY\Authenticated Users")
foreach ($group in $groups) {
    $accessRule = $acl.Access | Where-Object { $_.IdentityReference -eq $group }
    if ($group -eq "NT AUTHORITY\SYSTEM" -or $group -eq "BUILTIN\Administrators") {
        if ($accessRule.FileSystemRights -ne $expectedRights -or $accessRule.AccessControlType -ne $expectedAccessControlType) { Write-Output "FAIL"; Exit 1 }
    } elseif ($group -eq "NT AUTHORITY\Authenticated Users") {
        if ($accessRule.FileSystemRights -ne [System.Security.AccessControl.FileSystemRights]::Read -or $accessRule.AccessControlType -ne $expectedAccessControlType) { Write-Output "FAIL"; Exit 1 }
    }
}
Write-Output "PASS"

Remediation

Maintain the permissions of the "$env:ProgramData/ssh/sshd_config" file as follows:

NT AUTHORITY\SYSTEM:(F)
BUILTIN\Administrators:(F)
NT AUTHORITY\Authenticated Users:(RX)