RDS database instances should use a non-default port

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Description

Confirm Amazon RDS database instances are not using default ports. This includes default ports such as MySQL/Aurora port 3306, SQL Server port 1433, and PostgreSQL port 5432.

Rationale

Using a custom port can protect against potential brute-force and dictionary attacks.

Remediation

From the console

Follow the Modifying an Amazon RDS DB instance docs to verify you’re not using a default. You can modify your port by modifying that DB instance settings.

From the command line

  1. Run create-db-snapshot with your database instance and snapshot identifiers to create a snapshot.

    create-db-snapshot.sh

        aws rds create-db-snapshot \
        --db-instance-identifier database-mysql \
        --db-snapshot-identifier snapshotidentifier

  2. Run modify-db-instance with a new, valid port number. A list of port numbers are available.

    modify-db-instance.sh

        aws rds modify-db-instance \
        --db-instance-identifier database-identifier \
        --option-group-name test-group-name \
        --db-parameter-group-name test-sqlserver-name \
        --apply-immediately