Control: 1.5 Ensure Guest Users Are Reviewed on a Regular Basis

Description

Azure AD is extended to include Azure AD B2B collaboration, allowing you to invite people from outside your organization to be guest users in your cloud account and sign in with their own work, school, or social identities. Guest users allow you to share your company's applications and services with users from any other organization, while maintaining control over your own corporate data.

Work with external partners, large or small, even if they don't have Azure AD or an IT department. A simple invitation and redemption process lets partners use their own credentials to access your company's resources as a guest user.

Guest users in every subscription should be review on a regular basis to ensure that inactive and unneeded accounts are removed.

Remediation

From Azure Portal

1. From Azure Home select the Portal Menu
2. Select Azure Active Directory
3. Select Users
4. Click on Add filter
5. Select User type
6. Select Guest from the Value drop down
7. Click Apply
8. Delete all Guest users that are no longer required or are inactive

From Azure CLI

Before deleting the user, set it to inactive using the ID from the Audit Procedure to determine if there are any dependent systems.

az ad user update --id <exampleaccountid@domain.com> --account-enabled {false}

After determining that there are no dependent systems delete the user.

Remove-AzureADUser -ObjectId <exampleaccountid@domain.com>

From Azure PowerShell

Before deleting the user, set it to inactive using the ID from the Audit Procedure to determine if there are any dependent systems.

Set-AzureADUser -ObjectId "<exampleaccountid@domain.com>" -AccountEnabled false

After determining that there are no dependent systems delete the user.

PS C:\>Remove-AzureADUser -ObjectId <exampleaccountid@domain.com>

Default Value

By default no guest users are created.