Ensure 'Disable additional security checks on VBA library references that may refer to unsafe locations on the local machine' is set to 'Disabled'

AltaNivel 1Automatizadaoffice

Descripción

This policy setting restricts VBA to checking project library references only against the registry and trusted zones. The recommended state for this setting is: Disabled Rationale: A remote code execution vulnerability exists when Microsoft Office improperly loads arbitrary type libraries. An attacker could then install programs, view, change, or delete data, or create new accounts with full user rights. User setting: the audit checks HKEY_USERS\<SID>\SOFTWARE\Policies\Microsoft\vba\security:disablestrictvbarefssecurity (REG_DWORD) in every loaded user hive (S-1-5-21-*) and is compliant when each holds 0. It prints 'no-user-hive-loaded' (FAIL) when no user profile is loaded, so scan while users are logged on.

Cómo se verifica

Método de auditoría: Registro de Windows

registry

$sids = @(Get-ChildItem -Path 'Registry::HKEY_USERS' -ErrorAction SilentlyContinue | Where-Object { $_.PSChildName -match '^S-1-5-21-\d+-\d+-\d+-\d+$' } | ForEach-Object { $_.PSChildName }); if ($sids.Count -eq 0) { 'no-user-hive-loaded' } else { $bad = @(); foreach ($s in $sids) { $v = (Get-ItemProperty -Path ('Registry::HKEY_USERS\' + $s + '\SOFTWARE\Policies\Microsoft\vba\security') -Name 'disablestrictvbarefssecurity' -ErrorAction SilentlyContinue).'disablestrictvbarefssecurity'; if (-not ($null -ne $v -and @(0) -contains [int64]$v)) { $bad += $s + ':disablestrictvbarefssecurity=' + $v } }; if ($bad.Count -eq 0) { 'compliant' } else { 'non-compliant: ' + ($bad -join ', ') } }

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Configure through Group Policy (User Configuration): User Configuration\Administrative Templates\Microsoft Office 2016\Security Settings\Disable additional security checks on VBA library references that may refer to unsafe locations on the local machine = Disabled

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: officeproductivitycis-l1
Referencia: CIS Microsoft Office Enterprise Benchmark v2.0.0 - 2.3.27.9 Ensure 'Disable additional security checks on VBA library references that may refer to unsafe locations on the local machine' is set to 'Disabled'

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target office