MySQL instances should have the 'local_infile' database flag set to 'off'

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Description

Datadog recommends setting the local_infile database flag for a Cloud SQL MySQL instance to off.

Rationale

The local_infile flag controls the server-side LOCAL capability for LOAD DATA statements. Depending on the local_infile setting, the server refuses or permits local data loading by clients that have LOCAL enabled on the client side.

To explicitly cause the server to refuse LOAD DATA LOCAL statements (regardless of how client programs and libraries are configured at build time or runtime), start mysqld with local_infile disabled. local_infile can also be set at runtime.

Due to security issues associated with the local_infile flag, Datadog recommends disabling it. This recommendation is applicable to MySQL database instances.

Impact

Disabling local_infile causes the server to refuse local data loading by clients that have LOCAL enabled on the client side.

Remediation

From Console

  1. In the Google Cloud Console, navigate to Cloud SQL Instances page.
  2. Select the MySQL instance where the database flag needs to be enabled.
  3. Click Edit.
  4. Scroll down to the Flags section.
  5. To set a flag that has not been set on the instance before, click Add item, choose the local_infile flag from the dropdown menu, and set its value to off.
  6. Click Save.
  7. Confirm the changes under Flags on the Overview page.

From Command Line

  1. List all Cloud SQL database instances using
    `gcloud sql instances list`.
  2. Configure the local_infile database flag for every Cloud SQL MySQL database instance using
    `gcloud sql instances patch INSTANCE_NAME --database-flags local_infile=off`
    Note: This command overwrites all previously set database flags. To keep these flags and add new ones, include all flag values to be set on the instance. Otherwise, flags that are not specifically included are set to its default value. For flags that do not take a value, specify the flag name followed by an equals sign, for example: =.

Default Value

By default, local_infile is on.

References

  1. https://cloud.google.com/sql/docs/mysql/flags
  2. https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_local_infile
  3. https://dev.mysql.com/doc/refman/5.7/en/load-data-local.html

Additional Information

This patch modifies database flag values, which may require you to restart your instance. Check the list of supported flags to see if your instance will restart when this patch is submitted.