Data Redaction security feature in Oracle Database 12c can be easily disrupted by an attacker without any need to use exploit code, a security researcher long known as a thorn in Oracle’s side said at Defcon. David Litchfield is a security specialist at Datacomm TSS and the author of The Oracle Hacker’s Handbook, for many years, he was one of the top bug hunters in the game and specialized in digging into the Oracle’s database products and breaking them. He said that the methods he found were so simple and so easily done that he doesn’t even feel right to call them exploits.
Source: https://thehackernews.com/2014/08/Vulnerability-Oracle-Data-Redaction-Security.html