Ensure Sign-in frequency is enabled and browser sessions are not persistent for Administrative users

高レベル 1手動レビューm365

説明

In complex deployments, organizations might have a need to restrict authentication sessions. Conditional Access policies allow for the targeting of specific user accounts. Some scenarios might include: - Resource access from an unmanaged or shared device - Access to sensitive information from an external network - High-privileged users - Business-critical applications Note: This CA policy can be added to the previous CA policy in this benchmark "Ensure multifactor authentication is enabled for all users in administrative roles" Forcing a time out for MFA will help ensure that sessions are not kept alive for an indefinite period of time, ensuring that browser sessions are not persistent will help in prevention of drive-by attacks in web browsers, this also prevents creation and saving of session cookies leaving nothing for an attacker to take.

チェック方法

監査方法: 手動レビュー

この推奨事項は自動ではチェックできません。--include-manual を指定すると、スキャン結果にこの手順付きで一覧表示されます。

Note: Break-glass accounts should be excluded from all Conditional Access policies. To audit using the UI: 1. Navigate to Microsoft Entra admin center https://entra.microsoft.com/. 2. Expand Entra ID > Conditional Access and select Policies. 3. Verify that a policy exists with the following criteria and is set to On: o Under Users or agents (Preview) verify Directory roles specific to administrators are included. o Verify that only documented user exclusions exist and that they are reviewed annually. o Under Target resources verify All resources (formerly 'All cloud apps') is selected. o Verify that only documented resource exclusions exist and that they are reviewed annually. o Under Session verify Sign-in frequency is checked and set to Periodic reauthentication. o Verify the timeframe is set to the time determined by the organization. o Verify that Periodic reauthentication does not exceed 4 hours (or less). o Verify that Persistent browser session is set to Never persistent. 4. Verify that Enable policy is set to On To audit using the Microsoft Graph API: 1. Execute a GET request to the following relative URI: v1.0/identity/conditionalAccess/policies 2. Filter to policies wh...

修正方法

修正方法: ガイダンスまたは IaC パッチ

To remediate using the UI: 1. Navigate to Microsoft Entra admin center https://entra.microsoft.com/. 2. Expand Entra ID > Conditional Access and select Policies. 3. Click New policy. o Under Users or agents (Preview) include Select users and groups and check Directory roles. o At a minimum, include the directory roles listed below in this section of the document. o Under Target resources include All resources (formerly 'All cloud apps'). ▪ Under Exclude exclude any break-glass accounts. o Under Grant select Grant Access and check Require multifactor authentication. o Under Session select Sign-in frequency select Periodic reauthentication and set it to 4 hours (or less). o Check Persistent browser session then select Never persistent in the drop-down menu. 4. Under Enable policy set it to Report-only. 5. Click Create. 6. After allowing the policy to run in Report-only mode for at least one week, review the Sign-in logs for any unexpected impact, then return to the policy and set Enable policy to On. At minimum these directory roles should be included in the policy: - Application administrator - Authentication administrator - Billing administrator - Cloud application administrator...

プロパティ

オペレーティングシステム: すべて
タグ: m365saas
参照: CIS Microsoft 365 Foundations Benchmark v7.0.0 - 5.2.2.4 Ensure Sign-in frequency is enabled and browser sessions are not persistent for Administrative users