💼 Management Samenvatting
Deze security regelen waarborgt de correcte configuratie van beveiligingsinstellingen op Windows endpoints.
Aanbeveling
IMPLEMENT
Risico zonder
High
Risk Score
7/10
Implementatie
2u (tech: 1u)
Van toepassing op:
✓ Windows
Deze instelling is onderdeel van de Windows security baseline en beschermt tegen bekende aanvalsvectoren door het afdwingen van veilige configuraties.
PowerShell Modules Vereist
Primary API: Graph
Connection:
Required Modules: Microsoft.Graph.DeviceManagement
Connection:
Connect-MgGraphRequired Modules: Microsoft.Graph.DeviceManagement
Implementatie
Dit regelen configureert connection filter safe list via Microsoft Intune apparaat configuratie beleid of compliance policies om Windows endpoints te beveiligen volgens security best practices.
Vereisten
m365
Implementatie
Gebruik PowerShell-script connection-filter-safe-list.ps1 (functie Invoke-Monitoring) – Monitoren.
monitoring
Gebruik PowerShell-script connection-filter-safe-list.ps1 (functie Invoke-Monitoring) – Controleren.
Remediatie
Gebruik PowerShell-script connection-filter-safe-list.ps1 (functie Invoke-Remediation) – Herstellen.
Compliance en Auditing
Beleid documentatie
Compliance & Frameworks
- CIS M365: Control 18.9.19.2 (L1) - CIS Security Benchmark aanbevelingen
- BIO: 16.01 - BIO Baseline Informatiebeveiliging Overheid - 16.01 - Gebeurtenissen logging en audittrails
- ISO 27001:2022: A.12.4.1 - ISO 27001:2022 - Gebeurtenissen logging en audittrails
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
Connection Filter Safe List Review
.DESCRIPTION
Ensures the "Safe List" feature is disabled in connection filter.
Safe List allows subscribed mailing lists to bypass filtering - security risk.
.NOTES
Filename: connection-filter-safe-list.ps1
Author: Nederlandse Baseline voor Veilige Cloud
.EXAMPLE
.\connection-filter-safe-list.ps1 -Monitoring
Check if safe list is disabled
#>
#Requires -Version 5.1
#Requires -Modules ExchangeOnlineManagement
[CmdletBinding()]
param(
[Parameter(Mandatory = $false)]
[switch]$Monitoring,
[Parameter(Mandatory = $false)]
[switch]$Remediation,
[Parameter(Mandatory = $false)]
[switch]$Revert,
[switch]$WhatIf
)
$ErrorActionPreference = 'Stop'
Write-Host "`n========================================" -ForegroundColor Cyan
Write-Host "Connection Filter Safe List" -ForegroundColor Cyan
Write-Host "========================================`n" -ForegroundColor Cyan
function Invoke-Monitoring {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
Write-Host "Checking connection filter safe list..." -ForegroundColor Gray
$policy = Get-HostedConnectionFilterPolicy -ErrorAction Stop
$safeListEnabled = $policy.EnableSafeList
if ($safeListEnabled) {
Write-Host " [FAIL] SAFE LIST: ENABLED (Security Risk!)" -ForegroundColor Red
Write-Host " Known senders bypass ALL filtering" -ForegroundColor Red
Write-Host "`n[FAIL] NON-COMPLIANT" -ForegroundColor Red
exit 1
}
else {
Write-Host " [OK] SAFE LIST: DISABLED (Secure)" -ForegroundColor Green
Write-Host "`n[OK] COMPLIANT" -ForegroundColor Green
exit 0
}
}
catch {
Write-Host "`n[FAIL] ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Remediation {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-HostedConnectionFilterPolicy
if (-not $policy.EnableSafeList) {
Write-Host " [OK] Safe list already disabled" -ForegroundColor Green
exit 0
}
Write-Host "Disabling safe list..." -ForegroundColor Gray
Set-HostedConnectionFilterPolicy -Identity $policy.Name -EnableSafeList $false -ErrorAction Stop
Write-Host "`n[OK] Safe list disabled" -ForegroundColor Green
Write-Host "All mail now subject to proper filtering" -ForegroundColor Cyan
exit 0
}
catch {
Write-Host "`n[FAIL] ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Revert {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-HostedConnectionFilterPolicy
Set-HostedConnectionFilterPolicy -Identity $policy.Name -EnableSafeList $true -ErrorAction Stop
Write-Host " ⚠️ Safe list enabled" -ForegroundColor Yellow
exit 0
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
try {
if ($Revert) {
Invoke-Revert
}
elseif ($Monitoring) {
Invoke-Monitoring
}
elseif ($Remediation) {
Invoke-Remediation
}
else {
Write-Host "Use: -Monitoring | -Remediation | -Revert" -ForegroundColor Yellow
}
}
catch { throw }
finally {
Write-Host "`n========================================`n" -ForegroundColor Cyan
}
Risico zonder implementatie
Risico zonder implementatie
High: No auth tracking.
Management Samenvatting
Schakel in audit logging.
- Implementatietijd: 2 uur
- FTE required: 0.01 FTE