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Password Security Hole Discovered in Certain FileVault Configurations on OS X 10.7.3
In specific configurations, applying OS X Lion update 10.7.3 turns on a system-wide debug log file that contains the login passwords of every user who has logged in since the update was applied. The passwords are stored in clear text.The issue was noted last Friday by David Emery on the Cryptome mailing list.
Anyone who used FileVault encryption on their Mac prior to Lion, upgraded to Lion, but kept the folders encrypted using the legacy version of FileVault is vulnerable. FileVault 2 (whole disk encryption) is unaffected.
This is worse than it seems, since the log in question can also be read by booting the machine into firewire disk mode and reading it by opening the drive as a disk or by booting the new-with-LION recovery partition and using the available superuser shell to mount the main file system partition and read the file. This would allow someone to break into encrypted partitions on machines they did not have any idea of any login passwords for.Emery also offers some suggestions for dealing with the issue, including turning on FileVault 2 and setting a firmware password on the machine in question.
The issue was actually first noted in the Apple discussion forums back on February 6, just days after OS X 10.7.3 was released to the public. That poster now notes that the issue may extend further than just the specific FileVault situation outlines by others, as he notes that he has experienced the same behavior on an OS X Lion virtual machine through VMware Fusion, without FileVault ever having been active on the installation. Consequently, the extent of the issue may not yet be fully known.
Apple has yet to offer any response to the issue, although it is unclear when the company became aware of it. Apple touts the security features of OS X Lion in its promotional materials for the operating system, with a focus on FileVault as an important component of that security, and it seems likely that the company will move as quickly as possible to investigate and fix the issue.