Jamie Dimon says cyber warfare is the biggest risk to the financial system

Banks may be in sound condition post-Lehman Brothers, but the financial system could crack again if hit with a devastating cyber attack, J.P. Morgan Chief Executive Jamie Dimon warned on Thursday.

"I think the biggest vulnerability is cyber, just for about everybody" he told CNBC's Indian affiliate CNBC TV-18 on Thursday. "I think we have to focus on it, the United States government has to focus on it."