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1.1.2 Ensure that 'Multi-Factor Auth Status' is 'Enabled' for all Privileged Users (Manual)​

Profile Applicability​

• Level 1

Description​

Enable Multi-Factor Authentication (MFA) for all roles, groups, and users that have write access or permissions to Azure resources. These include custom created objects or built-in roles such as;

  • Service Co-Administrators
  • Subscription Owners
  • Contributors

Rationale​

Multi-factor authentication requires an individual to present a minimum of two separate forms of authentication before access is granted. Multi-factor authentication provides additional assurance that the individual attempting to gain access is who they claim to be. With multi-factor authentication, an attacker would need to compromise at least two different authentication mechanisms, increasing the difficulty of compromise and thus reducing the risk.

Impact​

Users would require two forms of authentication before any access is granted. Additional administrative time will be required for managing dual forms of authentication when enabling multi-factor authentication.

Audit​

From Azure Portal​

  1. From Azure Home select the Portal Menu
  2. Select the Azure Active Directory blade
  3. Then Users
  4. All Users
  5. Click on the Per-User MFA button in the top row menu
  6. Ensure that MULTI-FACTOR AUTH STATUS is Enabled for all users who are Service Co-Administrators, Owners, OR Contributors.

From Azure REST API​

For Every Subscription, For Every Tenant

Step 1: Identify Users with Administrative Access

  1. List All Users Using Microsoft Graph API: 
GET https://graph.microsoft.com/v1.0/users

Capture id and corresponding userPrincipalName ('$uid', '$userPrincipalName')

  1. List all Role Definitions Using Azure management API: 
https://management.azure.com/subscriptions/:subscriptionId/providers/Microsoft.Authorization/roleDefinitions?api-version=2017-05-01

Capture Role Definition IDs/Name ('$name') and role names ('$properties/roleName') where "properties/roleName" contains (Owner or *contributor or admin )

  1. List All Role Assignments (Mappings $A.uid to $B.name) Using Azure Management API: 
GET https://management.azure.com/subscriptions/:subscriptionId/providers/Microsoft.Authorization/roleassignments?api-version=2017-10-01-preview

Find all administrative roles ($B.name) in "Properties/roleDefinitionId" mapped with user ids ($A.id) in "Properties/principalId" where "Properties/principalType" == "User"

  1. Now Match ($CProperties/principalId) with $A.uid and get $A.userPrincipalName save this as D.userPrincipalName

Step 2: Run MSOL Powershell command: 

Get-MsolUser -All | where {$_.StrongAuthenticationMethods.Count -eq 0} | Select-Object -Property UserPrincipalName

If the output contains any of the $D.userPrincipalName, then this recommendation is non-compliant.

Please note that at the time of writing, there is no API, Azure CLI or Powershell mechanism available to programmatically conduct security assessment or remediation for this recommendation. The only option is MSOL.

Remediation​

From Azure Portal​

  1. From Azure Home select the Portal Menu.
  2. Select Azure Active Directory blade.
  3. Select Users.
  4. Take note of all users with the role Service Co-Administrators, Owners or Contributors.
  5. Click the Per-User MFA button in the top row menu.
  6. Check the box next to each noted user.
  7. Click Enable under quick steps in the right-hand panel.
  8. Click enable multi-factor auth.
  9. Click close.

Other Options within Azure Portal

Follow Microsoft Azure documentation and enable multi-factor authentication in your environment:

https://docs.microsoft.com/en-us/azure/active-directory/authentication/tutorial-enable-azure-mfa

Enabling and configuring MFA with conditional access policy is a multi-step process. Here are some additional resources on the process within Azure AD to enable multi-factor authentication for users within your subscriptions with conditional access policy:

https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/howto-conditional-access-policy-admin-mfa

https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-getstarted#enable-multi-factor-authentication-with-conditional-access

https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-mfasettings

Please note that at the time of writing, there is no API, Azure CLI or Powershell mechanism available to programmatically conduct security assessment or remediation for this recommendation. The only option is via the console.

References​

https://docs.microsoft.com/en-us/azure/multi-factor-authentication/multi-factor-authentication
https://stackoverflow.com/questions/41156206/azure-active-directory-premium-mfa-attributes-via-graph-api
https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-identity-management#im-4-use-strong-authentication-controls-for-all-azure-active-directory-based-access

Additional Information​

Please note that at the time of writing, there is no API, Azure CLI or Powershell mechanism available to programmatically conduct security assessment or remediation for this recommendation. The only option is via the console.

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