Ensure 'External sharing' of calendars is not available

낮음레벨 2수동 검토m365

설명

External calendar sharing allows an administrator to enable the ability for users to share calendars with anyone outside of the organization. Outside users will be sent a URL that can be used to view the calendar. Attackers often spend time learning about organizations before launching an attack. Publicly available calendars can help attackers understand organizational relationships and determine when specific users may be more vulnerable to an attack, such as when they are traveling.

점검 방법

감사 방식: 수동 검토

이 권장 사항은 자동으로 점검할 수 없습니다. --include-manual 옵션을 전달하면 스캔 결과에 이 지침과 함께 표시됩니다.

To audit using the UI: 1. Navigate to Microsoft 365 admin center https://admin.microsoft.com. 2. Expand Settings > Org settings. 3. In the Services section click Calendar. 4. Verify that Let your users share their calendars with people outside of your organization who have Office 365 or Exchange is unchecked. To audit using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following Exchange Online PowerShell command: Get-SharingPolicy -Identity "Default Sharing Policy" | ft Name,Enabled 3. Verify that Enabled is set to False

조치 방법

조치 방식: 가이드 또는 인프라 패치

To remediate using the UI: 1. Navigate to Microsoft 365 admin center https://admin.microsoft.com. 2. Expand Settings select Org settings. 3. In the Services section click Calendar. 4. Uncheck Let your users share their calendars with people outside of your organization who have Office 365 or Exchange. 5. Click Save. To remediate using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following Exchange Online PowerShell command: Set-SharingPolicy -Identity "Default Sharing Policy" -Enabled $False

속성

운영 체제: 모두
태그: m365saas
참고 자료: CIS Microsoft 365 Foundations Benchmark v7.0.0 - 1.3.3 Ensure 'External sharing' of calendars is not available