President's Security Flaw Guidance Seen Hard to Implement
Trove of Software Flaws Used by U.S. Spies Seen at Risk
 The White House’s directive to limit the use of software flaws by U.S. intelligence agencies could require the disclosure of thousands of precious exploits now in the hands of elite spying units, intelligence professionals say.The stockpile of exploits is derived from vulnerabilities not just in ordinary computer software, but also in industrial controllers, heating and cooling systems, printers, anti-virus software, video conferencing systems and encryption protocols.