Control: 5.2.4 Ensure that a multifactor authentication policy exists for all users

Description

A Conditional Access policy can be enabled to ensure that users are required to use Multifactor Authentication (MFA) to login.

Note: Since 2024, Azure has been rolling out mandatory multifactor authentication. For more information:

Remediation

Remediate from Azure Portal

From Azure Home open Portal menu in the top left, and select Microsoft Entra ID.
Select Security.
Select Conditional Access.
Select Policies.
Click + New policy.
Enter a name for the policy.
Click the blue text under Users.
Under Include, select All users.
Under Exclude, check Users and groups.
Select users this policy should not apply to and click Select.
Click the blue text under Target resources.
Select All cloud apps.
Click the blue text under Grant.
Under Grant access, check Require multifactor authentication and click Select.
Set Enable policy to Report-only.
Click Create.

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

Default Value

Starting October 2024, MFA will be required for all accounts by default.

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v500_5_2_4

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v500_5_2_4 --share

SQL

This control uses a named query:

with role_template_ids as (
  select
    array_agg(role_template_id) as rid
  from
    azuread_directory_role
),
policy_with_mfa as (
  select
    tenant_id,
    count(p.*)
  from
    azuread_conditional_access_policy as p,
    role_template_ids as a
  where
    p.built_in_controls ?& array['mfa']
    and (p.users -> 'includeRoles')::jsonb ?| (a.rid)
    and jsonb_array_length(p.users -> 'excludeUsers') < 1
  group by
    tenant_id
),
tenant_list as (
  select
    distinct tenant_id,
    subscription_id,
    _ctx
  from
    azure_tenant
)
select
  t.tenant_id as resource,
  case
    when (select count from policy_with_mfa where tenant_id = t.tenant_id) > 0 then 'ok'
    else 'alarm'
  end as status,
  case
    when (select count from policy_with_mfa where tenant_id = t.tenant_id) > 0 then t.tenant_id || ' has MFA enabled for all users.'
    else t.tenant_id || ' has MFA disabled for all users.'
  end as reason,
  t.tenant_id
  
from
  tenant_list as t;

Control: 5.2.4 Ensure that a multifactor authentication policy exists for all users

Description

Remediation

Default Value

Usage

SQL

Tags