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• • • • It’s only eight days since Apple’s latest and greatest macOS 10.13 release, better known as High Sierra. But the first security update has already come out, and we suggest you apply it urgently. The update is called High Sierra 10.13 Supplemental Update, detailed in the security advisory APPLE-SA-2017-10-05-1. There are two bugs fixed; the is described thus: [BUG.] A local attacker may gain access to an encrypted APFS volume.

If a [password] hint was set in Disk Utility when creating an APFS encrypted volume, the password was stored as the hint. APFS is short for Apple File System, Apple’s new way of organising hard disks that replaces the old (but still supported), a 20-year-old filing system itself derived from Apple’s, or HFS, that dates back to the 1980s. By some accounts, APFS was long overdue: HFS Plus dated from the early days of Mac OS, and wasn’t really designed for the Unix core that was introduced in OS X (now macOS). For example, HFS Plus can’t deal with dates after 2040, and doesn’t allow multiple processes to access the filesystem at the same time, making it more sluggish and less future-proof than other widely-used filing systems such as NTFS on Windows and ext4 on Linux. New drivers, new utilities APFS was introduced as Apple’s default and preferred filing system in High Sierra. This means new drivers inside the operating system to support disks formatted with the new system, and new features in Apple’s disk management utilities to prepare APFS disk volumes for use.

There are two main disk management tools in macOS – the easy-to-use graphical tool Disk Utility, and the super-powerful but arcane command line program diskutil. It turns out that the APFS support in the High Sierra version of Disk Utility has feet of clay, as we’ll show here. • We erased a USB disk and created a new APFS (Encrypted) volume on it. • Disk Utility prompted us for a password (twice) and an optional hint. Ps3 emulator for mac download free.

• We entered keepthisSecret as the password and The hint should be shown as the hint. • Disk Utility created the encrypted volume and mounted it automatically. • We unplugged the USB disk and then plugged it back in, and macOS asked for the password. • We entered keepthisSecret and the disk was unlocked and mounted, showing that the password had been set as expected. So far, so good, until we unplugged the device and plugged it back in: • Again, macOS asked for the password.

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• This time, we clicked the [Show Hint] button before entering the password. • The password dialog revealed that keepthisSecret has been set as the hint as well as the password. The text The hint should be shown had, it seemed, simply been thrown away. In other words, if you set a password hint as suggested, anyone who stole your disk could “hack” the password simply by using Disk Utility’s [Show Hint] button! • If you haven’t created any new APFS encrypted volumes since upgrading to High Sierra, you are OK.

• If you created an APFS encrypted volume but didn’t specify a hint, you are OK. • If you created an APFS encrypted volume using diskutil you are OK (the bug is in Disk Utility, not the operating system itself). • If you upgraded to High Sierra from an earlier version of macOS, your disk will have been converted to APFS, but any hint you had before is left untouched (so far as we can tell), so you are OK. • Apply the APPLE-SA-2017-10-05-1 Supplemental Update as soon as you can. Kees Cook, a researcher at Google, actually decided to find out how long bugs go undiscovered in the Linux kernel. He looked at over 500 bugs – the two bugs marked Critical took two years and five years to close, the 34 bugs marked High Severity had a mean average close time of six years.