Older versions left vulnerable. Apple has fixed a major security hole that has been present in its OS X operating system since at least 2011. The 10.10.3 update addresses the so-called "rootpipe" vulnerability, which allowed an attacker to gain the highest level of access to the computer without a password. The vulnerability existed in checking XPC entitlements and meant a process may gain admin privileges without properly authenticating, Apple revealed. The flaw was identified by TruSec security researcher Emil Kvarnhammer, who discovered the flaw last October and notified Apple's product security team the following day. Kvarnhammer said a planned full...