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1.2.6 Require Multi-factor Authentication for Azure Management (Manual)

Profile Applicability

• Level 1

Description

For designated users, they must use their Multi-Factor Authentication (MFA) process on logins.

Rationale

Enabling multi-factor authentication is a recommended setting to limit the use of Administrative actions and to prevent intruders from changing settings.

Impact

There is an increased cost, as Conditional Access policies require Azure AD Premium. Similarly, they may require additional overhead to maintain if users lose access to their MFA.

Audit

From Azure Portal

1. From Azure Home select the Portal Menu and select Azure Active Directory.
2. Scroll down in the menu on the left, and select Security.
3. Select on the left side Conditional Access.
4. Select the policy you wish to audit.
5. View under Users and Groups the corresponding users and groups to whom the policy is applied.
6. View under Exclude to determine which Users and groups to whom the policy is not applied.

Remediation

From Azure Portal

1. From Azure Home open the Portal Menu in top left, and select Azure Active Directory.
2. Select Security.
3. Select Conditional Access.
4. Click + New policy.
5. Enter a name for the policy.
6. Select Users or workload identities.
7. Under Include, select All users.
8. Under Exclude, select Users and groups.
9. Select users this policy not should apply to and click Select.
10. Select Cloud apps or actions.
11. Select Select apps.
12. Check the box next to Microsoft Azure Management and click Select.
13. Select Grant.
14. Under Grant access, select Require multi-factor authentication and click Select.
15. Set Enable policy to Report-only.
16. Click Create.

After testing the policy in report-only mode, update the Enable policy setting from Report-only to On.

References

https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-identity-management#im-7-restrict-resource-access-based-on--conditions
https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/concept-conditional-access-users-groups

Additional Information

Test these policies by using the What If tool in the References. Setting these can create issues with administrators changing settings until they use an MFA device linked to their accounts. Best practices recommend using an emergency access account for this eventuality if all administrators get locked out. Please see the documentation in the references for further information. Similarly you can perform further testing via the insights and reporting resource in References which monitors Azure sign ins.