L1 BIO 16.01 ISO A.12.4.1 CIS 18.9.19.2

Guests Cannot Reshare

📅 2025-10-30
•
⏱️ 2 minuten lezen
•
🔴 Must-Have

💼 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: Connect-MgGraph
Required Modules: Microsoft.Graph.DeviceManagement

Implementatie

Dit regelen configureert guests cannot reshare via Microsoft Intune apparaat configuratie beleid of compliance policies om Windows endpoints te beveiligen volgens security best practices.

Vereisten

m365

Implementatie

Gebruik PowerShell-script guests-cannot-reshare.ps1 (functie Invoke-Monitoring) – Monitoren.

monitoring

Gebruik PowerShell-script guests-cannot-reshare.ps1 (functie Invoke-Monitoring) – Controleren.

Remediatie

Gebruik PowerShell-script guests-cannot-reshare.ps1 (functie Invoke-Remediation) – Herstellen.

Compliance en Auditing

Beleid documentatie

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 Guests Cannot Reshare .DESCRIPTION Prevents external users from resharing content to prevent data sprawl .NOTES NL Baseline v2.0 #> #Requires -Version 5.1 #Requires -Modules Microsoft.Graph [CmdletBinding()] param([switch]$Monitoring) $ErrorActionPreference = 'Stop' Write-Host "`n========================================" -ForegroundColor Cyan Write-Host "Guests Cannot Reshare" -ForegroundColor Cyan Write-Host "========================================`n" -ForegroundColor Cyan function Invoke-Monitoring { try { Connect-MgGraph -Scopes "Domain.Read.All" -NoWelcome -ErrorAction Stop $domain = (Get-MgDomain | Where-Object { $_.IsDefault }).Id $tenantName = $domain.Split('.')[0] Connect-SPOService -Url "https://$tenantName-admin.sharepoint.com" -ErrorAction Stop $tenant = Get-SPOTenant $result = @{ isCompliant = $tenant.PreventExternalUsersFromResharing prevented = $tenant.PreventExternalUsersFromResharing } Write-Host " External Users Can Reshare: $(if($result.prevented){'BLOCKED'}else{'ALLOWED'})" -ForegroundColor $( if ($result.prevented) { 'Green' }else { 'Red' } ) Write-Host "`n Security Benefits:" -ForegroundColor Cyan Write-Host " • Prevents data sprawl" -ForegroundColor Gray Write-Host " • Maintains sharing control" -ForegroundColor Gray Write-Host " • Reduces unauthorized distribution" -ForegroundColor Gray Write-Host " • Improves data governance" -ForegroundColor Gray if ($result.isCompliant) { Write-Host "`n[OK] COMPLIANT - External resharing blocked" -ForegroundColor Green exit 0 } else { Write-Host "`n[FAIL] NON-COMPLIANT - External resharing allowed!" -ForegroundColor Red exit 1 } } catch { Write-Host "ERROR: $_" -ForegroundColor Red exit 2 } } try { if ($Monitoring) { Invoke-Monitoring } else { Write-Host "Use: -Monitoring" -ForegroundColor Yellow } } catch { throw } finally { Write-Host "`n========================================`n" -ForegroundColor Cyan } function Invoke-Remediation { <# .SYNOPSIS Herstelt de configuratie naar de gewenste staat .DESCRIPTION Dit is een monitoring-only control, remediation delegeert naar monitoring #> [CmdletBinding()] param() Write-Host "[INFO] Dit is een monitoring-only control" -ForegroundColor Yellow Write-Host "[INFO] Running monitoring check..." -ForegroundColor Cyan Invoke-Monitoring }

Risico zonder implementatie

Risico zonder implementatie
High: No auth tracking.

Management Samenvatting

Schakel in audit logging.