Hackers could make a killing after finding vulnerability in medical device tech

When a team of hackers discovered that St. Jude Medical Inc.'s pacemakers and defibrillators had security vulnerabilities that could put lives at risk, they didn't warn St. Jude. Instead, the hackers, who work for cybersecurity startup MedSec, e-mailed Carson Block, who runs the Muddy Waters Capital LLC investment firm, in May. They had a money-making proposal.