Risk Level: Low
Cloud Entity: Amazon RDS
CloudGuard Rule ID: D9.AWS.NET.92
Covered by Spectral: Yes
Category: Database

GSL LOGIC

RDS should not have ( port=3306 and (dbType like '%mysql%' or dbType like '%mariadb%') ) or ( port=5432 and dbType like '%postgres%' ) or ( port=1521 and dbType like '%oracle%' ) or ( port=1433 and dbType like '%sqlserver%' )

REMEDIATION

From Portal

Go to the AWS RDS console: https://console.aws.amazon.com/rds/
In the left pane, choose 'Databases'
Mark the incompliant 'DB identifier'
Click 'Modify'
Under 'Connectivity' expand 'Connectivity'
Set 'Database port' to a non-default port
Press 'Continue' and apply the modification

From Command Line
To modify the database instance's port, use:

aws rds modify-db-instance --db-instance-identifier DB-IDENTIFIER --db-port-number PORT --no-apply-immediately

From TF
Set the 'port' argument within the 'aws_db_instance' resource block to a non-default port:

resource "aws_db_instance" "db_instance_example" {
  ..
  port = PORT
  ..
}

References

Amazon RDS

Amazon Relational Database Service (Amazon RDS) makes it easy to set up, operate, and scale a relational database in the cloud. It provides cost-efficient and resizable capacity while automating time-consuming administration tasks such as hardware provisioning, database setup, patching, and backups. It frees you to focus on your applications so you can give them the fast performance, high availability, security, and compatibility they need.

Compliance Frameworks

AWS CSA CCM v.4.0.1
AWS CloudGuard Best Practices
AWS Security Risk Management
CloudGuard AWS All Rules Ruleset