L1 BIO 12.04.01 CIS Windows - Firewall log path

Intune: Windows Firewall Public - Configure Log File Path

📅 2025-10-30
•
⏱️ 2 minuten lezen
•
🟢 Should-Have

💼 Management Samenvatting

Configure Public firewall log path - standard: %SystemRoot%\System32\LogFiles\Firewall\publicfw.log (separate from Domain log).

Aanbeveling
IMPLEMENT
Risico zonder
Low
Risk Score
2/10
Implementatie
2u (tech: 1u)
Van toepassing op:
✓ Windows 10
✓ Windows 11

Separate log files per profile: Domain profile: pfirewall.log (corporate network traffic), Public profile: publicfw.log (public WiFi traffic - SEPARATE), Private profile: privatefw.log. Benefits: Separate analysis (public WiFi attacks vs corporate network), SIEM: Different retention/alerting per profile (public = higher priority alerts), Forensics: 'Show me public WiFi attacks' → publicfw.log.

PowerShell Modules Vereist
Primary API: Microsoft Graph API
Connection: Connect-MgGraph
Required Modules: Microsoft.Graph.DeviceManagement

Implementatie

Public log path: Policy: Log file path: %SystemRoot%\System32\LogFiles\Firewall\publicfw.log, Effect: Public profile traffic logged separately, SIEM: Forward publicfw.log → priority alerts (public WiFi = hostile environment).

Vereisten

  1. Intune subscription
  2. Windows 10/11
  3. Public firewall logging enabled

Implementatie

Intune Settings Catalog: Windows Firewall → Public Profile → Log file path: %SystemRoot%\System32\LogFiles\Firewall\publicfw.log (standard).

Compliance

CIS Windows Benchmark L1, BIO 12.04.

Monitoring

Gebruik PowerShell-script enable-public-network-firewall-log-file-path-is-set-to-systemroot-system32-logfiles-firewall-publicfw-log.ps1 (functie Invoke-Monitoring) – Controleren.

Remediatie

Gebruik PowerShell-script enable-public-network-firewall-log-file-path-is-set-to-systemroot-system32-logfiles-firewall-publicfw-log.ps1 (functie Invoke-Remediation) – Herstellen.

Compliance & Frameworks

Automation

Gebruik het onderstaande PowerShell script om deze security control te monitoren en te implementeren. Het script bevat functies voor zowel monitoring (-Monitoring) als remediation (-Remediation).

PowerShell
<# .SYNOPSIS Intune Windows Firewall: Public Log Path .DESCRIPTION CIS - Public log path publicfw.log. .NOTES Filename: firewall-public-log-path.ps1|Author: Nederlandse Baseline voor Veilige Cloud|NetSH: Public LogFileName|Expected: publicfw.log #> #Requires -Version 5.1 #Requires -RunAsAdministrator [CmdletBinding()]param([switch]$WhatIf, [switch]$Monitoring, [switch]$Remediation, [switch]$Revert) $ErrorActionPreference = 'Stop'; $Profile = "Public" function Connect-RequiredServices { $p = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent()); return $p.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator) } function Test-Compliance { $r = [PSCustomObject]@{ScriptName = "firewall-public-log-path.ps1"; PolicyName = "Firewall Public Log Path"; IsCompliant = $false; CurrentValue = $null; Details = @() }; function Invoke-Revert { Set-NetFirewallProfile -Name $Profile -LogFileName "%SystemRoot%\System32\LogFiles\Firewall\pfirewall.log" } try { $fw = Get-NetFirewallProfile -Name $Profile -ErrorAction SilentlyContinue; if ($fw) { $r.CurrentValue = $fw.LogFileName; if ($fw.LogFileName -match 'publicfw\.log') { $r.IsCompliant = $true; $r.Details += "Log path OK" }else { $r.Details += "Log path: $($fw.LogFileName)" } }else { $r.Details += "Profile niet gevonden" } }catch { $r.Details += "Error: $($_.Exception.Message)" }; return $r } function Invoke-Remediation { $path = "$env:SystemRoot\System32\LogFiles\Firewall\publicfw.log"; if (-not(Test-Path (Split-Path $path))) { New-Item -Path (Split-Path $path) -ItemType Directory -Force | Out-Null }; Set-NetFirewallProfile -Name $Profile -LogFileName $path; Write-Host "Public log path configured" -ForegroundColor Green } function Invoke-Monitoring { $r = Test-Compliance; Write-Host "`n$($r.PolicyName): $(if($r.IsCompliant){'COMPLIANT'}else{'NON-COMPLIANT'})" -ForegroundColor $(if ($r.IsCompliant) { 'Green' }else { 'Red' }); return $r } function Invoke-Revert { Set-NetFirewallProfile -Name $Profile -LogFileName "%SystemRoot%\System32\LogFiles\Firewall\pfirewall.log" } try { if (-not(Connect-RequiredServices)) { exit 1 }; if ($Monitoring) { $r = Invoke-Monitoring; exit $(if ($r.IsCompliant) { 0 }else { 1 }) }elseif ($Remediation) { if (-not $WhatIf) { Invoke-Remediation } }elseif ($Revert) { Invoke-Revert }else { $r = Test-Compliance; exit $(if ($r.IsCompliant) { 0 }else { 1 }) } }catch { Write-Error $_; exit 1 }

Risico zonder implementatie

Risico zonder implementatie
Low: Low: Non-standard path = log collection issues.

Management Samenvatting

Public firewall log: publicfw.log (standard path). Separate from Domain log. SIEM priority alerts. Implementatie: 1-2 uur.