TMA-OFFICE-2.2.4.7.2.1.3

Ensure 'Don't allow Dynamic Data Exchange (DDE) server lookup in Excel' is set to 'Enabled'

YüksekDüzey 1Otomatikoffice

Açıklama

This policy setting allows controls whether Dynamic Data Exchange (DDE) server lookup is allowed. The DDE protocol is a set of messages and guidelines. It sends messages between applications that share data and uses shared memory to exchange data between applications. Rationale: In an email attack scenario, an attacker could leverage the DDE protocol by sending a specially crafted file to the user and then convincing the user to open the file, typically by way of an enticement in an email. User setting: the audit checks HKEY_USERS\<SID>\SOFTWARE\Policies\Microsoft\office\16.0\excel\security\externalcontent:disableddeserverlookup (REG_DWORD) in every loaded user hive (S-1-5-21-*) and is compliant when each holds 1. It prints 'no-user-hive-loaded' (FAIL) when no user profile is loaded, so scan while users are logged on.

Nasıl denetlenir

Denetim yöntemi: Windows kayıt defteri

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\' + $s + '\SOFTWARE\Policies\Microsoft\office\16.0\excel\security\externalcontent') -Name 'disableddeserverlookup' -ErrorAction SilentlyContinue).'disableddeserverlookup'; if (-not ($null -ne $v -and @(1) -contains [int64]$v)) { $bad += $s + ':disableddeserverlookup=' + $v } }; if ($bad.Count -eq 0) { 'compliant' } else { 'non-compliant: ' + ($bad -join ', ') } }

Beklenen çıktı: compliant

Nasıl düzeltilir

Düzeltme yöntemi: Kılavuz veya altyapı yaması

Configure through Group Policy (User Configuration): User Configuration\Administrative Templates\Microsoft Excel 2016\Excel Options\Security\Trust Center\External Content\Don’t allow Dynamic Data Exchange (DDE) server lookup in Excel = Enabled

Özellikler

İşletim sistemleri: Herhangi biri
Etiketler: officeproductivitycis-l1
Referans: CIS Microsoft Office Enterprise Benchmark v2.0.0 - 2.2.4.7.2.1.3 Ensure 'Don't allow Dynamic Data Exchange (DDE) server lookup in Excel' is set to 'Enabled'

Bu ana makineyi denetle

Bunu denetleme izniniz olan bir makinede çalıştırın. Tarama salt okunurdur.

shell

tmaegis scan --target office