Ensure 'Set default file block behavior' is set to 'Enabled: Blocked files are not opened'

ÉlevéeNiveau 1Automatiséeoffice

Description

This policy setting determines if users can open, view, or edit Excel files that are by default blocked by Microsoft Office. The recommended state for this setting is: Enabled: Blocked files are not opened. Rationale: By default, users can open a wide range of legacy file formats in Office that were not designed with modern security protections in mind. Several of these formats have been associated with vulnerabilities that attackers have exploited. User setting: the audit checks HKEY_USERS\<SID>\SOFTWARE\Policies\Microsoft\office\16.0\excel\security\fileblock:openinprotectedview (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.

Méthode de vérification

Méthode d'audit: Registre 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\' + $s + '\SOFTWARE\Policies\Microsoft\office\16.0\excel\security\fileblock') -Name 'openinprotectedview' -ErrorAction SilentlyContinue).'openinprotectedview'; if (-not ($null -ne $v -and @(0) -contains [int64]$v)) { $bad += $s + ':openinprotectedview=' + $v } }; if ($bad.Count -eq 0) { 'compliant' } else { 'non-compliant: ' + ($bad -join ', ') } }

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Configure through Group Policy (User Configuration): User Configuration\Administrative Templates\Microsoft Excel 2016\Excel Options\Security\Trust Center\File Block Settings\Set Default File Block Behavior = Enabled: Blocked files are not opened

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: officeproductivitycis-l1
Référence: CIS Microsoft Office Enterprise Benchmark v2.0.0 - 2.2.4.7.2.2.13 Ensure 'Set default file block behavior' is set to 'Enabled: Blocked files are not opened'

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

shell

tmaegis scan --target office