![]() ![]() In addition to locking down the Mac's boot environment, the firmware password prevents resetting hardware variables like the PRAM. ![]() However, locking the firmware also makes it so someone would need the firmware password to access the boot menu. Apple's Firmware Password Utility is available by default from the Utilities menu in the OS X installer or recovery partition.Īnother means of bypassing OS X security measures is to hold the Option key at startup to view the boot menu and select a secondary volume such as an external USB drive to boot from, and subsequently access any file on the internal boot volume. These include Single User mode, in which the system drops you to a command line with root privileges, and Safe mode, in which nonessential and third-party system services (including security options) may be disabled at startup. Locking the firmware prevents the system from accepting boot arguments and loading in modes that might allow access to sensitive data. If this concerns you, you might consider locking the system's firmware. ![]() Even with robust security software installed on a Mac system and Apple's efforts to prevent unwanted tampering, someone with brief physical access to your Mac can bypass security measures by booting to alternative volumes or loading in Single User mode. ![]()
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