Ensure that your AWS Redshift database clusters are using custom master user names instead of the default master user name (i.e. "awsuser") in order to add an additional layer of defense against non-targeted attacks.
Changing the default master user name for Redshift database clusters represents a basic security measure, therefore it will improve the overall security, however, this measure does not fully protect against attackers that can guess or obtain the database user names using social engineering techniques. To implement advanced Redshift database security, you should restrict the root account only to privileged users, use strong and complex passwords and grant permissions to trusted users only at the database level.
Using the default master user name to access your Redshift database clusters represent a potential security concern. Changing the master user name ("awsuser") will add an extra layer of security, protecting your publicly accessible Amazon Redshift clusters against hacking.
To determine if your existing Redshift database clusters are using the default master user name, perform the following:
To change the default master user name for your existing Amazon Redshift database clusters, you must relaunch those clusters with a different master user name and migrate the existing data to the new clusters. To launch the new Redshift database clusters and move the existing data between databases, perform the following: