Control: 2.4 Ensure Guest Users Are Reviewed on a Regular Basis

Description

Microsoft Entra ID has native and extended identity functionality 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 are typically added outside your employee on-boarding/off-boarding process and could potentially be overlooked indefinitely. To prevent this, guest users should be reviewed on a regular basis. During this audit, guest users should also be determined to not have administrative privileges.

Remediation

From Azure Portal

1. From Azure Home select the Portal Menu.
2. Select Microsoft Entra ID.
3. Under Manage, select Users.
4. Click on Add filter.
5. Select User type.
6. Select Guest from the Value dropdown.
7. Click Apply.
8. Check the box next to all Guest users that are no longer required or are inactive.
9. Click Delete.
10. Click OK.

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.