Ensure 'User owned apps and services' is restricted

MoyenneNiveau 1Revue manuellem365

Description

By default, users can install add-ins in their Microsoft Word, Excel, and PowerPoint applications, allowing data access within the application. Do not allow users to install add-ins in Word, Excel, or PowerPoint. Attackers commonly use vulnerable and custom-built add-ins to access data in user applications. While allowing users to install add-ins by themselves does allow them to easily acquire useful add-ins that integrate with Microsoft applications, it can represent a risk if not used and monitored carefully. Disabling future users' ability to install add-ins in Microsoft Word, Excel, or PowerPoint helps reduce your threat-surface and mitigate this risk.

Méthode de vérification

Méthode d'audit: Revue manuelle

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To audit using the UI: 1. Navigate to Microsoft 365 admin center https://admin.microsoft.com. 2. Expand Settings > Org settings. 3. In Services select User owned apps and services. 4. Verify that Let users access the Office Store and Let users start trials on behalf of your organization are not checked. To Audit using PowerShell: 1. Connect to the Microsoft Graph service using Connect-MgGraph -Scopes "OrgSettings-AppsAndServices.Read.All". 2. Run the following Microsoft Graph PowerShell command: $Uri = "https://graph.microsoft.com/beta/admin/appsAndServices/settings" Invoke-MgGraphRequest -Uri $Uri 3. Verify both isOfficeStoreEnabled and isAppAndServicesTrialEnabled are False.

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

To remediate using the UI: 1. Navigate to Microsoft 365 admin center https://admin.microsoft.com. 2. Expand Settings > Org settings. 3. In Services select User owned apps and services. 4. Uncheck Let users access the Office Store and Let users start trials on behalf of your organization. 5. Click Save. To remediate using PowerShell 1. Connect to the Microsoft Graph service using Connect-MgGraph -Scopes "OrgSettings-AppsAndServices.ReadWrite.All". 2. Run the following Microsoft Graph PowerShell commands: $uri = "https://graph.microsoft.com/beta/admin/appsAndServices" $body = @{ "Settings" = @{ "isAppAndServicesTrialEnabled" = $false "isOfficeStoreEnabled" = $false } } | ConvertTo-Json Invoke-MgGraphRequest -Method PATCH -Uri $uri -Body $body

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: m365saas
Référence: CIS Microsoft 365 Foundations Benchmark v7.0.0 - 1.3.4 Ensure 'User owned apps and services' is restricted