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

高レベル 1自動office

説明

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.

チェック方法

監査方法: Windows レジストリ

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 ', ') } }

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

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

プロパティ

オペレーティングシステム: すべて
タグ: officeproductivitycis-l1
参照: 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'

このホストをチェック

監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target office