An unpatched security hole in Apple’s OS X operating system could be used by attackers to change key system settings or to take control of vulnerable computers, security researchers warn. In a posting to news-for-nerds site Slashdot.org on Wednesday, an anonymous reader noted that a core component of OS X 10.4 (Tiger) and 10.5 (Leopard) called Apple Remote Desktop Agent could be leveraged by any user on the machine to install new programs or alter important system settings. Generally, these tasks are reserved for only the “root” account — the most powerful user account on the system — or at the very least they require the user to first enter a password for the requested changes to take effect. The security hole has to do with the fact that ARDAgent accepts commands from Applescript, the scripting language built into OS X. As a result, a simple one line script can