A security researcher has just, reportedly, found a way to gain control of Macs using OS X. The exploits allow attackers to remotely overwrite firmware responsible for booting up the device. Once attackers isolate the flaw in a targeted machine, they could control the computer as soon as it boots up. The specific exploit discovered by Pedro Vilaca is explained in detail in an article on his blog. This attack can give a user continuous, low-level control of a Mac without any initial physical access; therefore, hackers from the other side of the globe can exploit your system.