Information
The SYSIBM.SYSROLEAUTH table contains information on all roles and their respective grantees. It is recommended that the PUBLIC role be restricted from accessing this table.
Rationale:
PUBLIC should not have access to see the grants of the roles because this could be used as a point of exploit.
Solution
Perform the following to revoke access from PUBLIC.
Connect to the Db2 database.
db2 => connect to <dbname>
Run the following command:
db2 => REVOKE SELECT ON SYSIBM.SYSROLEAUTH FROM PUBLIC