lacework-global-286
6.3.2 Set the 'cross db ownership chaining' database flag for Cloud SQL on SQL Server instance to 'off' (Automated)
Profile Applicability
• Level 1
Description
Best practices recommend setting cross db ownership chaining
database flag for Cloud SQL on SQL Server instance to off
.
Rationale
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 cross-database ownership chaining and you are aware of the security implications of this setting.This recommendation is applicable to SQL Server database instances.
Impact
Updating flags may cause the database to restart. This may cause it to unavailable for a short amount of time, so this is best done at a time of low usage. You should also determine if the tables in your databases reference another table without using credentials for that database, as turning off cross database ownership will break this relationship.
Audit
From Console:
- Go to the Cloud SQL Instances page in the Google Cloud Console.
- Select the instance to open its
Instance Overview
page - Ensure the database flag
cross db ownership chaining
that has been set is listed under theDatabase flags
section.
From Command Line:
- Ensure the below command returns
off
for every Cloud SQL SQL Server database instance:
gcloud sql instances list --format=json | jq '.settings.databaseFlags[] | select(.name=="cross db ownership chaining")|.value'
Remediation
From Console:
- Go to the Cloud SQL Instances page in the Google Cloud Console by visiting: https://console.cloud.google.com/sql/instances.
- Select the SQL Server instance for which you want to enable to database flag.
- Click
Edit
. - Scroll down to the
Flags
section. - To set a flag that is new to the instance, click
Add item
, choose the flagcross db ownership chaining
from the drop-down menu, and set its value tooff
. - Click
Save
. - Confirm the changes under
Flags
on the Overview page.
From Command Line:
- Configure the
cross db ownership chaining
database flag for every Cloud SQL on SQL Server database instance using the below command:
gcloud sql instances patch <instance_name> --database-flags "cross db ownership chaining=off"
This command overwrites all database flags previously set. To keep those and add new ones, include the values for all flags to set on the instance; any flag not specifically included uses the default value. For flags that do not take a value, specify the flag name followed by an equals sign ("=").
References
https://cloud.google.com/sql/docs/sqlserver/flags
https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/cross-db-ownership-chaining-server-configuration-option?view=sql-server-ver15
Additional Information
This patch modifies database flag values, which may require you to restart your instance. The list of supported flags is on this page, along with details of which flags require a restart: https://cloud.google.com/sql/docs/sqlserver/flags.
Some database flag settings can affect instance availability or stability, and remove the instance from the Cloud SQL Service-Level Agreement (SLA). For information about these flags, see Operational Guidelines.
Configuring the preceding flag does not restart the Cloud SQL instance.