Ensure public access is disabled for AWS MQ Brokers

Allowing unrestricted, public access to cloud services could open an application up to external attack. Disallowing this access is typically considered best practice.

In AWS Console -

1. Sign in to the AWS Console and go to the MQ dashboard.
2. Go to the Network and security section and change 'Public Accessibility' to 'disabled'.

In Terraform -

1. In the aws_mq_broker resource, set the publicly_accessible field to false.

References:
https://docs.aws.amazon.com/amazon-mq/latest/developer-guide/accessing-web-console-of-broker-without-public-accessibility.html
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/mq_broker#publicly_accessible