A severe zero-day vulnerability in Apple’s Mac OS X is reportedly being exploited in the wild by hackers. The vulnerability could allow attackers to install malware and adware onto a target Mac, running OS X 10.10 (Yosemite) operating system without requiring victims to enter system passwords. The issue resides in a hidden Unix file Sudoers which is a list of files as to which software are allowed to get root permissions on a computer. Security researchers from anti-malware firm Malwarebytes spotted a malicious installer exploiting the vulnerability.
Source: https://thehackernews.com/2015/08/mac-os-x-zero-day-exploit.html