Control: 1.23 Ensure That No Custom Subscription Owner Roles Are Created

Description

Subscription ownership should not include permission to create custom owner roles. 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 under Navigate
Select in the left column Access control (IAM)
In the row select of filters Role:, then the # Displayed
In the list of checkmarks deselect 'Show all' to display no roles.
Search for Owner or select it if it already displayed to show only users with the Owner role
To remove this permission from a user, select the checkbox under the Owner
In the top row, select Remove X
Select Yes

From Azure CLI

az role definition list

Check for entries with assignableScope of / or a subscription, and an action of * Verify the usage and impact of removing the role identified

az role definition delete --name "rolename"

Default Value

By default, no custom owner roles are created.

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v150_1_23

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v150_1_23 --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;