A “Rootpipe” backdoor in various Mac OS X versions, or a security flaw that could give hackers full access to a Mac without authentication, was supposedly patched by Apple in an OS X 10.10.3 update earlier that month. But it looks like the patch doesn’t quite fix the security flaw, The Hacker News reports, as Yosemite computers are still vulnerable to Rootpipe-based attacks. Furthermore, Macs running OS X 10.9 or later have not been patched, and it's likely they won't be.
‘Rootpipe’ OS X Yosemite security vulnerability not as patched as initially believed