Archived - About the security content of the Mac OS X 10.4.6 Update
Mac OS X 10.4
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Mac OS X v10.4.6 Update
Available for: Mac OS X 10.4.5
Impact: Firmware password can be bypassed on Intel-based Macintosh computers
Description: Intel-based Macintosh computers support the firmware password feature. Prior to this update, a person with physical access to the computer could bypass the firmware password and access Single User Mode. This update addresses the issue by enhancing the security provided by the firmware password. Credit to David Pugh of the University of Michigan for reporting this issue.