Publisher: Disable Unsigned Add-ins

πŸ’Ό Management Samenvatting

Disable unsigned Publisher add-ins - blocks ALL unsigned executable code (stricter than 'require trusted publisher').

Aanbeveling
IMPLEMENT
Risico zonder
Medium
Risk Score
6/10
Implementatie
3u (tech: 1u)
Van toepassing op:
βœ“ Microsoft Publisher

Unsigned add-ins = zero verification: Publisher add-ins: Extend functionality (COM add-ins, automation), Unsigned = untrusted (no publisher identity, no integrity check), Malware risk: Fake 'Publisher enhancement' add-in = trojan. 'Require trusted publisher': Unsigned blocked OR prompts user, 'Disable unsigned' (THIS): ALL unsigned BLOCKED (no user override - strictest).

PowerShell Modules Vereist
Primary API: Intune / GPO
Connection: Registry-based
Required Modules:

Implementatie

Disable unsigned: Policy: Disable all unsigned application add-ins: Enabled, Effect: Unsigned add-ins BLOCKED (no prompt, no override), Signed + trusted: Auto-allow, Signed (not trusted): Prompt user, Code signing: Required for corporate add-ins.

Vereisten

  1. Publisher 2016+
  2. Code signing infrastructure
  3. Intune of GPO

Implementatie

Intune Settings Catalog: Publisher\Security\Trust Center β†’ Disable all unsigned application add-ins: Enabled.

Compliance

CIS Office Benchmark L2, BIO 12.06.

Monitoring

Gebruik PowerShell-script disable-unsigned-addins.ps1 (functie Invoke-Monitoring) – Controleren.

Remediatie

Gebruik PowerShell-script disable-unsigned-addins.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 Schakelt Trust Bar meldingen voor niet-ondertekende add-ins uit en blokkeert deze in Publisher .DESCRIPTION Dit script implementeert CIS control O365-PU-000002 voor het uitschakelen van Trust Bar meldingen voor niet-ondertekende applicatie add-ins en het blokkeren ervan in Microsoft Publisher. Dit voorkomt dat gebruikers onveilige add-ins kunnen uitvoeren zonder expliciete waarschuwingen. .REQUIREMENTS - PowerShell 5.1 of hoger - Lokale administrator rechten voor registry wijzigingen - Microsoft Publisher geΓ―nstalleerd .PARAMETER Monitoring Controleert de huidige compliance status .PARAMETER Remediation Past de aanbevolen configuratie toe .PARAMETER Revert Herstelt de originele configuratie .PARAMETER WhatIf Toont wat er zou gebeuren zonder wijzigingen door te voeren .EXAMPLE .\disable-unsigned-addins.ps1 -Monitoring Controleert of Trust Bar meldingen zijn uitgeschakeld .EXAMPLE .\disable-unsigned-addins.ps1 -Remediation Schakelt Trust Bar meldingen uit voor niet-ondertekende add-ins .NOTES Registry pad: HKCU:\Software\Policies\Microsoft\Office\16.0\Publisher\Security\TrustCenter Waarde: DisableTrustBarNotificationForUnsignedAddins = 1 CIS Control: O365-PU-000002 DISA STIG: Microsoft Office 365 ProPlus v3r3 #> #Requires -Version 5.1 param( [switch]$Monitoring, [switch]$Remediation, [switch]$Revert, [switch]$WhatIf ) # Globale variabelen $RegistryPath = "HKCU:\Software\Policies\Microsoft\Office\16.0\Publisher\Security\TrustCenter" $ValueName = "DisableTrustBarNotificationForUnsignedAddins" $ExpectedValue = 1 $ControlID = "O365-PU-000002" function Test-Compliance { try { if (-not (Test-Path $RegistryPath)) { return $false } $currentValue = Get-ItemProperty -Path $RegistryPath -Name $ValueName -ErrorAction SilentlyContinue return ($currentValue -and $currentValue.$ValueName -eq $ExpectedValue) } catch { return $false } } function Invoke-Monitoring { Write-Host "Monitoring ${ControlID}: Trust Bar meldingen voor niet-ondertekende add-ins uitschakelen" -ForegroundColor Green try { if (-not (Test-Path $RegistryPath)) { Write-Host "βœ— Registry pad bestaat niet: $RegistryPath" -ForegroundColor Red return $false } $currentValue = Get-ItemProperty -Path $RegistryPath -Name $ValueName -ErrorAction SilentlyContinue if ($currentValue -and $currentValue.$ValueName -eq $ExpectedValue) { Write-Host "βœ“ Control compliant: ${ValueName} = $ExpectedValue (Niet-ondertekende add-ins geblokkeerd)" -ForegroundColor Green return $true } else { $actualValue = if ($currentValue) { $currentValue.$ValueName } else { "Not Set" } Write-Host "βœ— Control non-compliant: ${ValueName} = $actualValue (Expected: $ExpectedValue)" -ForegroundColor Red return $false } } catch { Write-Host "βœ— Fout bij controleren registry instelling: $($_.Exception.Message)" -ForegroundColor Red return $false } } function Invoke-Remediation { Write-Host "Remediating ${ControlID}: Trust Bar meldingen voor niet-ondertekende add-ins uitschakelen" -ForegroundColor Yellow try { if ($WhatIf) { Write-Host "WhatIf: Zou registry waarde instellen: ${ValueName} = $ExpectedValue" -ForegroundColor Cyan return $true } if (-not (Test-Path $RegistryPath)) { Write-Host "Registry pad aanmaken: $RegistryPath" -ForegroundColor Yellow New-Item -Path $RegistryPath -Force | Out-Null } Set-ItemProperty -Path $RegistryPath -Name $ValueName -Value $ExpectedValue -Type DWord -Force Write-Host "βœ“ Registry waarde succesvol ingesteld: ${ValueName} = $ExpectedValue" -ForegroundColor Green Start-Sleep -Seconds 1 return Invoke-Monitoring } catch { Write-Host "βœ— Fout bij configureren registry instelling: $($_.Exception.Message)" -ForegroundColor Red return $false } } function Invoke-Revert { Write-Host "Reverting ${ControlID}: Trust Bar meldingen herstellen" -ForegroundColor Yellow try { if ($WhatIf) { Write-Host "WhatIf: Zou registry waarde verwijderen: ${ValueName}" -ForegroundColor Cyan return $true } if (Test-Path $RegistryPath) { Remove-ItemProperty -Path $RegistryPath -Name $ValueName -ErrorAction SilentlyContinue Write-Host "βœ“ Registry waarde verwijderd: ${ValueName}" -ForegroundColor Green } return $true } catch { Write-Host "βœ— Fout bij herstellen registry instelling: $($_.Exception.Message)" -ForegroundColor Red return $false } } # Hoofd uitvoering try { if ($Monitoring) { $result = Invoke-Monitoring exit $(if ($result) { 0 } else { 1 }) } elseif ($Remediation) { $result = Invoke-Remediation exit $(if ($result) { 0 } else { 1 }) } elseif ($Revert) { $result = Invoke-Revert exit $(if ($result) { 0 } else { 1 }) } else { Write-Host "Gebruik: .\disable-unsigned-addins.ps1 [-Monitoring] [-Remediation] [-Revert] [-WhatIf]" -ForegroundColor Yellow Write-Host " -Monitoring: Controleer huidige compliance status" -ForegroundColor White Write-Host " -Remediation: Pas aanbevolen configuratie toe" -ForegroundColor White Write-Host " -Revert: Herstel originele configuratie" -ForegroundColor White Write-Host " -WhatIf: Toon wat er zou gebeuren" -ForegroundColor White Write-Host "" Write-Host "Handmatige configuratie:" -ForegroundColor Cyan Write-Host "Group Policy: User Configuration > Administrative Templates > Microsoft Publisher 2016" -ForegroundColor White Write-Host "> Publisher Options > Security > Trust Center" -ForegroundColor White Write-Host "> Disable Trust Bar Notification for unsigned application add-ins and block them: Enabled" -ForegroundColor White } } catch { Write-Host "βœ— Onverwachte fout: $($_.Exception.Message)" -ForegroundColor Red exit 1 }

Risico zonder implementatie

Risico zonder implementatie
Medium: Medium: Unsigned Publisher add-ins = malware risk.

Management Samenvatting

Disable Publisher unsigned add-ins (strict). No user override. Code signing required. Implementatie: 1-3 uur.