Control: 6.3.2 Ensure that the 'cross db ownership chaining' database flag for Cloud SQL SQL Server instance is set to 'off'

Description

It is recommended to set cross db ownership chaining database flag for Cloud SQL SQL Server instance to off.

Use the cross db ownership for chaining option to configure cross-database ownership chaining for an instance of Microsoft SQL Server. This server option allows you to control cross-database ownership chaining at the database level or to allow cross-database ownership chaining for all databases.

Enabling cross db ownership is not recommended unless all of the databases hosted by the instance of SQL Server must participate in crossdatabase ownership chaining and you are aware of the security implications of this setting.

Remediation

This recommendation is applicable to SQL Server database instances.

From Console

1. Login in to Cloud SQL Instances
2. Select the SQL Server instance for which you want to enable to database flag.
3. Under Configuration section
4. Scroll down to the Database flags section. Click on Edit Configurations
5. In the edit page, navigate to Flags and Parameters section
6. To set a flag that has not been set on the instance before, click Add item, choose the flag cross db ownership chaining from the drop-down menu, and set its value to off.
7. Click Save to save your changes.
8. Confirm your changes under Flags on the Overview page.

Note: Any changes to the database flag values, may require your instance to be restarted

From Command Line

1. List all Cloud SQL database Instances

gcloud sql instances list

2. Configure the required database flag for every Cloud SQL SQL Server database instance using the below command.

gcloud sql instances patch INSTANCE_NAME --database-flags "cross db ownership chaining=off"

Note: This command will overwrite all database flags previously set. To keep those and add new ones, include the values for all flags you want set on the instance; any flag not specifically included is set to its default value. For flags that do not take a value, specify the flag name followed by an equals sign ("=").