djackson 22568 (12/16/2013)
I am not knowledgeable enough to consider myself a cracker (true term for what the media calls hacker, all of us are hackers), but even I can break into a huge percentage of systems. Take anyone with minimal skills, or anyone willing to download automated tools, and the vast majority of systems are at risk.
Try "System" and "Manager" on Oracle systems. Works like "sa" and "" on many SQL Server systems.