Control: 1.22 Ensure That No Custom Subscription Administrator Roles Exist

Description

The principle of least privilege should be followed and only necessary privileges should be assigned instead of allowing full administrative access.

Classic subscription admin roles offer basic access management and include Account Administrator, Service Administrator, and Co-Administrators. It is recommended the least necessary permissions be given initially. Permissions can be added as needed by the account holder. This ensures the account holder cannot perform actions which were not intended.

Remediation

From Azure Portal

From Azure Home select the Portal Menu.
Select Subscriptions.
Select Access control (IAM).
Select Roles.
Click Type and select CustomRole from the drop down menu.
Check the box next to each role which grants subscription administrator privileges.
Select Remove.
Select Yes.

From Azure CLI

List custom roles:

az role definition list --custom-role-only True

Check for entries with assignableScope of / or the subscription, and an action of *. To remove a violating role:

az role definition delete --name <role name>

Note that any role assignments must be removed before a custom role can be deleted. Ensure impact is assessed before deleting a custom role granting subscription administrator privileges.

Default Value

By default, no custom owner roles are created.

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v210_1_22

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v210_1_22 --share

SQL

This control uses a named query:

with owner_custom_roles as (
  select
    role_name,
    role_type,
    title,
    action,
    _ctx,
    subscription_id
  from
    azure_role_definition,
    jsonb_array_elements(permissions) as s,
    jsonb_array_elements_text(s -> 'actions') as action
  where
    role_type = 'CustomRole'
    and action in ('*', '*:*')
)
select
  cr.subscription_id as resource,
  case
    when count(*) > 0 then 'alarm'
    else 'ok'
  end as status,
  case
    when count(*) = 1 then 'There is one custom owner role.'
    when count(*) > 1 then 'There are ' || count(*) || ' custom owner roles.'
    else 'There are no custom owner roles.'
  end as reason
  
  , sub.display_name as subscription
from
  owner_custom_roles cr,
  azure_subscription sub
where
  sub.subscription_id = cr.subscription_id
group by
  cr.subscription_id,
  cr._ctx,
  sub.display_name;