Apple Releases macOS High Sierra 10.13 Supplemental Update to Address Security Flaws, Bugs

Apple released macOS High Sierra 10.13 Supplemental Update on Thursday. The update fixes two important security flaws, one of which was just recently publicized. It also addresses three relatively minor bugs in macOS High Sierra.

macOS High Sierra

Apple’s patch notes for macOS High Sierra 10.13 Supplemental Update

This supplemental update includes improvements to the the stability, reliability and security of your Mac, and is recommended for all macOS High Sierra users. This update:

  • Improves installer robustness
  • Fixes a cursor graphic bug when using Adobe InDesign
  • Resolves an issue where email messages couldn’t be deleted from Yahoo accounts in Mail

Security patch notes for macOS High Sierra 10.13 Supplemental Update


Available for: macOS High Sierra 10.13
Impact: A local attacker may gain access to an encrypted APFS volume
Description: If a hint was set in Disk Utility when creating an APFS encrypted volume, the password was stored as the hint. This was addressed by clearing hint storage if the hint was the password, and by improving the logic for storing hints.
CVE-2017-7149: Matheus Mariano of Leet Tech


Available for: macOS High Sierra 10.13
Impact: A malicious application can extract keychain passwords
Description: A method existed for applications to bypass the keychain access prompt with a synthetic click. This was addressed by requiring the user password when prompting for keychain access.
CVE-2017-7150:Patrick Wardle of Synack

New downloads of macOS High Sierra 10.13 include the security content of the macOS High Sierra 10.13 Supplemental Update.

The update is a 923.4MB download at the link above for the standalone installer. As of this writing, I’m not seeing the update in Software Update, but it will likely appear later in the day.

macOS 10.13 High Sierra problems: how to fix them

If you are experiencing macOS 10.13 High Sierra problems, then you’ve come to the right place, as we’ve put together a list of fixes for the most common macOS High Sierra issues.

If you have encountered any macOS High Sierra problems, then this guide should show you how to fix them. Due to how new macOS High Sierra is, we may not have covered all of the problems, but we will continue to update this guide as new issues are reported.

If you’ve encountered a macOS High Sierra problem that we haven’t covered, follow and tweet us and we’ll do what we can to find a solution.

From macOS High Sierra installation problems, to security risks and issues with making apps work, read on to find out how to fix the most common macOS High Sierra problems.

macOS High Sierra won’t download

A common macOS High Sierra problem at the moment is that macOS 10.13 begins to download, but then it pauses along with an error message that says “macOS High Sierra download has failed”.

Another common macOS High Sierra download problem shows the error message: “Installation of macOS could not continue. Installation requires downloading important content. That content can’t be downloaded at this time. Try again later.”

There are a few reasons why you may get this problem. It may be because a lot of people are trying to download macOS High Sierra at the same time. If this is the issue, try again later to see if the download now works.

It may also be worth switching from a Wi-Fi connection to an Ethernet cable, to ensure your internet connection is as reliable as possible.

If you’re still having problems downloading macOS High Sierra, try to find the partially-downloaded macOS 10.13 files and a file named ‘Install macOS 10.13’ on your hard drive. Delete them, then reboot your Mac and try to download macOS High Sierra again.

If you still have a problem downloading macOS High Sierra, open up the App Store, click ‘View My Account’ and see if there is anything in the ‘Unfinished Downloads’ section. You may be able to restart the download from there.

Finally, try logging out of the Store to see if that restarts the download.

macOS High Sierra install problems

If you’re having problems installing macOS High Sierra, first make sure you check out our how to download and install macOS 10.13 High Sierra guide, which will take you through the steps you need to take to safely install the new operating system.

If the macOS High Sierra download completes, but there’s no prompt for the installation to continue, then search in your Mac’s application folder for a file called ‘Install macOS 10.13’. Double-click the file to begin installation.

You also need to make sure that there is enough hard drive space on your Mac, otherwise the macOS High Sierra install will fail.

To fix the macOS High Sierra problem where the installation fails due to low disk space, restart your Mac and press CTL + R while it’s booting to enter the Recover menu. Select ‘Disk boot’ to boot normally, then remove any files you no longer need.

If you’re struggling to free up disk space, look out for hidden Time Machine files that may be taking up large amounts of space.

Once you have freed up enough space, retry the installation.

If macOS High Sierra encounters a problem at the end of installation, and then shows an error message, restart your Mac and press Command + Option + R on your keyboard while the Mac boots to start up the recovery system over the Internet. You can also try Shift + Option + Command + R.

If your Mac continues to fail to boot, follow Apple’s instructions on creating an external Mac startup disk.

It may be worth restarting your Mac in Safe Mode, then trying to install macOS 10.13 High Sierra from there to fix the problem.

Mac won’t start after installing macOS 10.13 High Sierra

If you’ve installed macOS High Sierra, but your Mac won’t start, then restart your Mac and hold down Command, Option, P and R, which will reset the NVRAM (non-volatile RAM).

Hold the keys down until the computer restarts and you hear the startup chime for the second time. Release the keys after you hear the second startup chime. The PRAM will be reset as well.

While in Safe Mode, run Disk Utility to see if that will fix any macOS High Sierra boot problems.

For other ways to fix a Mac that won’t start, check out our guides how to Use OS X boot options to troubleshoot your Mac and how to fix a Mac that won’t start.

macOS 10.13 High Sierra keeps logging you out

Some people have been reporting a problem where macOS High Sierra keeps randomly logging them out of their Mac.

It’s annoying, but the good news is there’s a number of fixes for this High Sierra problem.

First of all, go to Preferences > Security & Privacy > Advanced, and uncheck the box where it says ‘Log out after… minutes of inactivity’.

In the Security & Privacy window, click ‘General’ and uncheck the box ‘Require password after sleep or screen saver begins’. Remember the security implications of this, however.

If macOS High Sierra is logging you out while you’re using Chrome, try opening up the Chrome web browser and going to the settings. At the bottom of the screen click ‘Advanced’, then turn off hardware acceleration.

Apps won’t work in macOS 10.13 High Sierra

Another common macOS High Sierra problem is that some apps no longer work once you’ve upgraded to the new operating system.

This is especially common if you are using older programs. If you find that an app you used to use no long works in macOS 10.13 High Sierra, the first thing you should do is check to make sure have downloaded and installed any recent updates to the software.

You should also check the website of the software. This may contain updates or advice for getting your hardware to run.

If your software is very outdated, it may no longer be compatible with macOS High SIerra. If that’s the case, you should consider buying a newer version, or finding an alternative.

What apps don’t work with macOS 10.13 High Sierra?

Here’s a list of some of the apps that don’t currently work on macOS High Sierra. If you use them, consider upgrading to a newer version.

  • Final Cut Pro X 10.3.4: Update to the latest version of Final Cut Pro
  • Motion 5.3.2: Update to the latest version of Motion
  • Compressor 4.3.2: Update to the latest version of Compression
  • Logic Pro X 10.3.1: Update to the latest version of Logic
  • MainStage 3.3: Update to the latest version of MainStage
  • Adobe Photoshop CS4: Adobe has said it is not making sure this app is working in High Sierra, so best upgrade to the latest version to make sure.

Mac runs slowly after macOS High Sierra upgrade

If your Mac is running noticeably slower after upgrading, there are a number of things you can try to speed up macOS High Sierra and fix any problems that are slowing it down.

First of all, try restarting your Mac to see if that helps. If it doesn’t, force-quit any apps that appear to be taking up a lot of RAM. You can identify these by using Activity Monitor (in /Applications/Utilities) to establish what apps and processes are using up the most CPU or RAM. Its CPU tab lists active processes, with a real-time view of what’s going on.

To force-quit an item, click it in the Activity Monitor list, click the X at the left of the toolbar, then confirm you want to force-quit.

Also delete the cache. Open the Finder window, select ‘Go’ from the top menu and select ‘Go to Folder’.

In the text box that appears type /Library/Caches

Remove the data from inside every folder. Now repeat the process with /Library/Caches (without the symbol). Running the Repair Disk tool from within Disk Utility may also help, and for more solutions check out our  guide. 

macOS High Sierra battery problems

Has the battery life of your MacBook become shorter since installing macOS High Sierra? 

This is a common complaint at the moment, so you can check to see what’s causing the battery drain in macOS High Sierra by opening up the Finder, then going to  Applications > Utilities > Activity Monitor > Energy.

From there you’ll see a graph with how much energy the programs you are running are taking up. If it’s a lot, you may want to check to see if there is an update to make the software run better in macOS High Sierra.

You may also want to uninstall the program and use an alternative.

Turning off location services, or stopping unnecessary animations and graphical effects in macOS High SIerra can also help prolong battery life.

For more advice, visit our how to improve your MacBook’s battery guide, and watch our video below.

macOS High Sierra password security problems

We recently reported that there is a major flaw in macOS High Sierra puts your passwords at risk. The exploit was discovered by Patrick Wardle, chief security researcher at ‎Synack, and also affects earlier versions of macOS, and it can be delivered by an unsigned app.

Apple should be working on a fix to this rather serious problem, but for now you should be extra careful when installing apps, and make sure that you only download them from trusted sources such as the App Store. We will update this section when Apple releases an official fix.

Apple dates macOS 10.13 High Sierra, iOS 11, and watchOS 4

Apple has officially dated the launch of its next operating system iterations: MacOS 10.13 High Sierra will now launch on September 25th, preceded by mobile-centric iOS 11 and watchOS 4 on September 19th – both of which come with next-generation hardware to boot.

The follow-up to last year’s macOS 10.12 Sierra launch, which brought with it a shift from the name OS X back to the classic macOS, macOS 10.13 High Sierra is more evolution than revolution. As well as tweaks to the included software – in particular a boost to Safari which sees it outperform rival Chrome by 80 percent for common JavaScript workloads, Apple has claimed – High Sierra includes the new Apple File System (APFS) to replace the outdated Hierarchical File System Plus (HFS+). The new standard filesystem across all Apple devices, APFS includes a range of improvements including on-the-fly compression, speed improvements, and creates hard links by default instead of copying the contents of files.

Other improvements in macOS 10.13 High Sierra include Metal 2.0, the latest version of Apple’s low-level graphics API, and support for the High Efficiency Video Codec (HEVC) H.265 – though hardware acceleration is only available on newer Apple hardware, with older devices relying on software-driven playback even after installing the final release of High Sierra.

At the same time Apple announced launch dates for iOS 11 and watchOS 4, the former running across the iPad, iPhone, iPod Touch, and Apple TV families of devices and the latter running on Apple’s smartwatch range as well as driving the Touch Bar integrated into the company’s latest MacBook laptops. For iOS 11, there’s the unsurprising launch of a new iPhone: the iPhone X, which includes 64GB or 256GB of storage, a high dynamic range (HDR) 2,436 x 1,125 pixel 5.8″ display, and Apple’s latest ARM-based 64-bit A11 ‘Bionic’ processor with integrated ‘Neural Engine’ and M11 motion-sensing co-processor. For those baulking at the £1,000-plus price tag associated with the new iPhone X, though, there’s also the iPhone 8 and 8 Plus, which drop to lower-resolution non-HDR displays but include the same A11 processor. Apple also announced a new Apple TV boasting 4K playback capabilities.

Smartwatch fans, meanwhile, have been offered the Apple Watch Series 3 – a device which borrows a trick Chinese smartwatch companies have been using for years and embeds a SIM card directly into the device allowing it access to LTE data networks without being tethered to a smartphone. The Apple Watch Series 3 will run the new watchOS 4 as standard, of course, which will also be released onto previous Apple Watch devices.

macOS 10.13 High Sierra: our 12 most anticipated features

The next version of macOS, dubbed High Sierra, is in part about laying groundwork for the future – or bringing the Mac into line with other platforms, depending on how you look at it. For starters, it will follow in the footsteps of iOS 10.3 by replacing the Mac’s aging file system with Apple File System (APFS). Apple says this has performance and security benefits, and will enable further innovation for the future.

Like iOS 11, High Sierra adds support for HEVC, enabling up to 40% better compression of video you’re working with. Playback of 4K HEVC video requires at least a sixth-generation (Skylake) Intel Core processor, though.

Apple’s modern graphics API, Metal, reaches version 2, and adds capabilities needed by virtual reality content creators, plus support for external graphics cards on some Macs. There’s more to High Sierra than technological changes behind the scenes, though. Here are our highlights.

1. No more intrusive online audio

Apple’s aware that online video that automatically plays when you land on or scroll down a page is irritating, and sometimes embarrassing. Safari deals with that by stopping videos that include audio from playing in the first place. Of course, you can tell the browser to make exceptions if you want to.

2. Improved privacy from trackers

Apple’s machine learning initiative is applied in Safari to stop your online activity being tracked and used to target you with tailored content that isn’t always beneficial. Time will tell how effective this is; similar initiatives are often circumvented by websites.

3. Custom site settings

Safari has previously provided the ability to adjust the default zoom level for all sites. Apple has recognised that you may want to use different settings for specific sites, so you can tell Safari to automatically use the Reader view for pages that it supports, what a site’s page zoom percentage should be, whether a site can autoplay video, and whether to prompt you or provide automatic access to your cam, mic, and location.

4. Find emails more quickly

Mail’s search feature can feel a little rudimentary at times, so the new version adds an important feature to help you pinpoint an important old message: it highlights likely matches, or Top Hits, above all other search results. These rankings take into account things like messages you’ve read and your designated VIPs, and the algorithm learns as you use it – machine learning once again!

5. Keep important notes in sight

The functionality of the Notes app has grown considerably in recent years, and you may no longer feel the need to use third-party alternatives such as Evernote. But the more you use Notes, the more likely it is that important stuff will get lost among the many items you create – so in High Sierra you can pin those notes to the top of the app.

6. Share files from iCloud drive

We’ve been hoping for this feature ever since Apple discontinued MobileMe and iDisk, the predecessors of iCloud and iCloud Drive. When you share a link with someone, they work on your original copy, which ought to reduce – and perhaps even eliminate – your need to send email attachments.

7. Once more, with feeling, Siri

Both High Sierra and iOS 11 include voices for Siri that sound more natural, with the ability to convey subtle inflection. This news is like music to our ears, and we’re hoping Apple can use this development to similarly enhance the Mac’s Text-to-Speech feature.

8. Tabular data in Notes

Got a few related figures to jot down and thinking Apple’s Numbers spreadsheet is overkill for the job? Or maybe you have other sets of data that are best summed up in a table. You can do all that in Notes now that it supports the creation of tables.

9. Live photos from FaceTime

The FaceTime app can save precious moments in calls as Live Photos, which are stored in your Photos library. Presumably to address privacy concerns, both people on a call receive a notification to tell them this has been done. This all sounds good, though we’re conscious of how short Live Photos are.

10. Share your iCloud storage

If you’re reluctant to pay for more iCloud storage for your family members, there’s great news. Soon you’ll have the ability to share a single plan among multiple people – though only if you choose a 200GB (£2.49/month) or 2TB (£6.99/month) plan. (In case you were wondering, Apple recently discontinued the 1TB plan, and reduced the price of the largest tier.)

11. Advanced photo editing

The Photos app continues to evolve, gaining powerful colour manipulation tools. Firstly, the app now has a Curves tool – as found in many professional image editing apps – enabling subtle contrast adjustments with just the tweak of a few points on a curve. There’s also a new Selective Colour tool for isolating and selecting where you want changes to be applied. But if all you want is to quickly make a picture more striking, colourful, or dramatic, there are new filters for that, too.

12. Third-party photo editors

It seems you’ll no longer be dependent on apps providing an extension in order to access their tools within Photos. When you choose an app from the Edit With menu and make changes to a picture using that app’s tools, your alterations are automatically saved back to your Photos library.

Apple releases second betas of iOS 11, macOS 10.13, watchOS 4, tvOS 11 to developers


Sixteen days after making the first releases available, Apple on Wednesday released second versions of its upcoming operating system refresh set to arrive this fall, with developers now able to access iOS 11, macOS 10.13 High Sierra, watchOS 4, tvOS 11 and and Xcode 9.

The second iOS 11 beta, carrying build number 15A5304i, arrives with a host of improvements and bug fixes addressed during the more than week-long interval since the first test version dropped on June 5.

As expected, Apple’s next-generation mobile operating system appears to carry the most changes, with upgrades to Siri, Apple Pay, Photos and a general user interface revamp. Of note, Apple has fully activated “Do Not Disturb While Driving,” a feature previewed at Worldwide Developers Conference that could lower the number of automobile crashes due to in-car device use.

In addition, Apple fixed 3D Touch functionality as it applies to data detectors (phone numbers, dates, addresses and other assets), while addressing a number of issues with third-party apps.

With the new beta, Android Migration now works as intended, Bluetooth communication is more reliable and apps over 100MB can be downloaded over cellular. Apple also fixed a bevy of first-party app bugs and a Control Center quirk that in some cases prohibited Bluetooth radio control.

The macOS High Sierra update, dubbed build 17A291j, contains a number of refinements and other improvements like Apple File System integration, migration from H.264 to H.265, and Metal 2. The update resolves an issue that prevented enabling FileVault on APFS volumes, and Apple incorporated improvements to Messages, OpenCL, FileVault and other apps and services.

Developers evaluating watchOS 4 build 15R5307f gain access to the set of animated “Toy Story” watch faces Apple demoed onstage at WWDC. The update also fixes issues related to haptic feedback, music playback, location-based HomeKit triggers and Siri usability.

Finally, tvOS 11 beta 2 build 15J5310e addresses a host of home screen problems like text clipping and app icons. Issues that cropped with individual apps, like Music, have been resolved, while developers can more easily connect to an Apple TV for QuickTime screen recording.

TestFlight implementation has been streamlined across all platforms.

Registered devices can get the new beta releases through the Software Update feature, while stand-alone images are available through Apple’s Developers portal.