Which has the higher priority in your organization: Deploying a new database or securing the ones you already have?
Looking for a website, and resources, dedicated solely to securing Oracle databases? Check out DBSecWorx.
Used to check the authorization for a user or to set an Oracle Database Vault secure application role. The DVSYS.DBMS_MACSEC_ROLES package is available to all users which is a gross violation of good security practices.
The Library recommends revoking the GRANT to PUBLIC and only granting execute on this package to a very limited number of authorized and audited users.