People who have accounts on the enrollment website for President Barack Obama’s signature health care law are being told to change their passwords following an administration-wide review of the government’s vulnerability to the confounding Heartbleed Internet security flaw. Senior administration officials said there is no indication that the HealthCare.gov site has been compromised and the action is being taken out of an abundance of caution. The government’s Heartbleed review is ongoing, the officials said, and users of other websites may also be told to change their passwords in the coming days, including those with accounts on the popular WhiteHouse.gov petitions page. The Heartbleed programming flaw has caused major security concerns across the Internet and affected a widely used encryption technology that was designed to protect online accounts.