Ensure 'Allow VBA to load typelib references by path from untrusted intranet locations' is set to 'Disabled'

AltaNível 1Automatizadaoffice

Descrição

This policy setting permits VBA to load typelib references by explicit path read from the project data if that path points to an intranet location that is not explicitly in the system trusted sites list. Rationale: The Visual Basic Application language can be abused by manipulating typelib references stored in untrusted locations. By preventing a user from overriding the default security settings this prevents a change to an unsecure state where harmful software could be more easily executed on a system. User setting: the audit checks HKEY_USERS\<SID>\SOFTWARE\Policies\Microsoft\vba\security:allowvbaintranetreferences (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.

Como é verificado

Método de auditoria: Registro do 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\' + $s + '\SOFTWARE\Policies\Microsoft\vba\security') -Name 'allowvbaintranetreferences' -ErrorAction SilentlyContinue).'allowvbaintranetreferences'; if (-not ($null -ne $v -and @(0) -contains [int64]$v)) { $bad += $s + ':allowvbaintranetreferences=' + $v } }; if ($bad.Count -eq 0) { 'compliant' } else { 'non-compliant: ' + ($bad -join ', ') } }

Saída esperada: compliant

Como é corrigido

Método de correção: Orientação ou patch de infraestrutura

Configure through Group Policy (User Configuration): User Configuration\Administrative Templates\Microsoft Office 2016\Security Settings\Allow VBA to load typelib references by path from untrusted intranet locations = Disabled

Propriedades

Sistemas operacionais: Qualquer
Tags: officeproductivitycis-l1
Referência: CIS Microsoft Office Enterprise Benchmark v2.0.0 - 2.3.27.6 Ensure 'Allow VBA to load typelib references by path from untrusted intranet locations' is set to 'Disabled'

Verificar este host

Execute isto em uma máquina que você tenha permissão para auditar. A varredura é somente leitura.

shell

tmaegis scan --target office