Microsoft 365
TMA-M365-1.3.3
Ensure 'External sharing' of calendars is not available
Mô tả
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.
Cách kiểm tra
Phương pháp kiểm tra: Xem xét thủ công
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
Cách khắc phục
Phương pháp khắc phục: Hướng dẫn hoặc bản vá hạ tầng
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
Thuộc tính
- Hệ điều hành
- Bất kỳ
- Thẻ
- m365saas
- Tham chiếu
- CIS Microsoft 365 Foundations Benchmark v7.0.0 - 1.3.3 Ensure 'External sharing' of calendars is not available