Two researchers with PhoneFactor, a company that offers two-factor authentication services, say that thay have uncovered a serious vulnerability in SSL (Secure Sockets Layer), a fundamental online security technology that’s widely used to safeguard ecommerce transactions and other sensitive data. The flaw, in theory, can enable attackers to insert themselves into a secured online transaction as a “man in the middle,” able to view all data moving back and forth between two parties—and alter the data stream and issue commands—on what the users believe is a secured connections.

