In this order: nothing, no, and no.
Buried -- literally buried in the story, in the ninth paragraph -- is this:
The technique — dubbed "Machiavelli" — exploits a vulnerability in the Mac OS X kernel, the heart of the machine's operating system. It only works on machines that have already been victimized, such as ones attacked with the pirated software.So, your Mac is fine unless it's been previously hacked, though no explanation is offered as to how this would happen.
That's like proclaiming in a headline "Your car could catch on fire any minute!" -- creating the impression that your little VW could mysteriously explode as if part of a Jerry Bruckheimer film -- and then going on to explain, in the ninth paragraph, that this could only happen if someone doused it in gallons of gasoline and then tossed a lit match onto it.
Way to uphold your journalistic integrity, Jim Finkle and MS (for Microsoft) NBC.