Cis Azure Foundations 5.25

Ensure 'Subscription leaving/entering Microsoft Entra tenant' is set to 'Permit no one'

Description

Users who are set as subscription owners are able to make administrative changes to the subscriptions and move them into and out of Microsoft Entra ID.

Rationale

Permissions to move subscriptions in and out of a Microsoft Entra tenant must only be given to appropriate administrative personnel. A subscription that is moved into a Microsoft Entra tenant may be within a folder to which other users have elevated permissions. This prevents loss of data or unapproved changes of the objects within by potential bad actors.

Impact

Subscriptions will need to have these settings turned off to be moved.

Audit Procedure

Using Azure Portal

1. From the Azure Portal Home select the portal menu
2. Select Subscriptions
3. In the Advanced options drop-down menu, select Manage Policies
4. Ensure Subscription leaving Microsoft Entra tenant and Subscription entering Microsoft Entra tenant are set to Permit no one

Expected Result

Both Subscription leaving Microsoft Entra tenant and Subscription entering Microsoft Entra tenant should be set to Permit no one.

Remediation

Using Azure Portal

1. From the Azure Portal Home select the portal menu
2. Select Subscriptions
3. In the Advanced options drop-down menu, select Manage Policies
4. Set Subscription leaving Microsoft Entra tenant and Subscription entering Microsoft Entra tenant to Permit no one
5. Click Save changes

Default Value

By default Subscription leaving Microsoft Entra tenant and Subscription entering Microsoft Entra tenant are set to Allow everyone (default).

References

1. https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/manage-azure-subscription-policy
2. https://learn.microsoft.com/en-us/entra/fundamentals/how-subscriptions-associated-directory
3. https://learn.microsoft.com/en-us/security/benchmark/azure/mcsb-identity-management#im-2-protect-identity-and-authentication-systems

CIS Controls

Profile

Level 2 | Manual