Apple has released updates to OS X and iTunes to address multiple vulnerabilities, some of which could allow an attacker to execute arbitrary code, obtain website credentials, or take control of the affected system.
Updates are available:
1: OS X Mavericks 10.9.3 for OS X Mavericks 10.9 to 10.9.2
2: iTunes 11.2 for Windows 8, 7, Vista, and XP SP3 or later
Users and administrators are encouraged to review Apple Security Updates HT6246 and HT6245, and apply the necessary updates.