{"id":70837,"date":"2017-10-05T15:32:01","date_gmt":"2017-10-05T22:32:01","guid":{"rendered":"https:\/\/www.intego.com\/mac-security-blog\/?p=70837"},"modified":"2017-10-05T15:32:01","modified_gmt":"2017-10-05T22:32:01","slug":"apple-issues-emergency-update-to-fix-disk-utility-bug-in-macos-high-sierra","status":"publish","type":"post","link":"https:\/\/www.intego.com\/mac-security-blog\/apple-issues-emergency-update-to-fix-disk-utility-bug-in-macos-high-sierra\/","title":{"rendered":"Apple Issues Emergency Update to Fix Disk Utility Bug in macOS High Sierra"},"content":{"rendered":"<p>Two days after macOS High Sierra was released, <a href=\"https:\/\/medium.com\/@matheusmariano\/new-macos-high-sierra-vulnerability-exposes-the-password-of-an-encrypted-apfs-container-b4f2f5326e79\" target=\"_blank\" rel=\"noopener\">a vulnerability was disclosed<\/a> by Brazilian software developer, Matheus Mariano. The vulnerability shows Disk Utility displaying the actual passwords of encrypted volumes when the &#8220;Show Hint&#8221; button is clicked, rather than the expected password hint. Fortunately, to address this security flaw, Apple has just released\u00a0macOS High Sierra 10.13 Supplemental Update.<\/p>\n<h3>Disk Utility Bug in macOS High Sierra<\/h3>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/by_nIjcHmEo?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation\"><\/iframe><\/span><\/p>\n<p>Apple&#8217;s first Supplemental Update for macOS High Sierra addresses a significant Disk Utility bug that exposes the passwords of encrypted Apple File System (APFS) volumes in plain text. The problem occurs when\u00a0creating encrypted APFS volumes; however, partitioning a drive and encrypting a partition does not show the same vulnerability.<\/p>\n<p>The best way to ensure this vulnerability cannot be exploited on your Mac is\u00a0to ensure unauthorized users cannot gain access to your system.\u00a0But what if you have encrypted APFS volumes on an external drive? If someone were to acquire your external drive and connect it to another Mac with macOS High Sierra installed, the Finder will pop-up the &#8220;enter password&#8221; dialog where the same vulnerability becomes visible. Clicking the &#8220;Show Hint&#8221; button will reveal the password.<\/p>\n<h3>macOS High Sierra 10.13 Supplemental Update<\/h3>\n<p>Apple&#8217;s macOS High Sierra 10.13 Supplemental Update\u00a0corrects this behavior on internal drives where the &#8220;Show Hint&#8221; button now works as it should. However, both the Finder and Disk Utility now no longer have a &#8220;Show Hint&#8221; button present when it comes to the external drive. That&#8217;s one way to ensure\u00a0the hint doesn&#8217;t accidentally display the actual password, but what if someone actually forgot their password and needs the hint?<\/p>\n<p>When we attempt to pull up the hint using Terminal, just a string of garble shows instead.<\/p>\n<blockquote><p><code>MacBook-Pro:~ jay$ diskutil apfs listCryptoUsers disk4s2<br \/>\nCryptographic user (1 found)<br \/>\n|<br \/>\n+-- 0759134B-33BA-4150-8F6C-AC6824846B4A<br \/>\nType: Disk<br \/>\nHint: C19B0F81-AC4A-4EC7-8197-B5DDEDB30A5E<\/code><\/p><\/blockquote>\n<p>The same happens when we connect the external drive back to a pre-supplemental update Mac, the &#8220;Show Hint&#8221; button is back but the hint shows alphanumeric garble.<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-70846 aligncenter\" src=\"https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2017\/10\/GarbledHint.png\" alt=\"\" width=\"860\" height=\"428\" srcset=\"https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2017\/10\/GarbledHint.png 860w, https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2017\/10\/GarbledHint-150x75.png 150w, https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2017\/10\/GarbledHint-300x149.png 300w, https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2017\/10\/GarbledHint-768x382.png 768w, https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2017\/10\/GarbledHint-657x327.png 657w\" sizes=\"(max-width: 860px) 100vw, 860px\" \/><br \/>\nThe affected volume needs to come into contact with a Mac that has the supplemental update installed, so that it can patch the vulnerability in case that volume is connected to a Mac that does not have the supplemental update installed yet.<\/p>\n<p>Encrypted APFS volumes that were created on a patched Mac will result in the &#8220;Show Hint&#8221; button appearing when it should, and it shows the actual hint. It looks like Apple was unable to actually\u00a0repair existing external encrypted APFS volumes, so instead it garbled the output of &#8220;Show Hint&#8221; in Terminal and simply hid the button in the Finder and Disk Utility. Not an elegant fix, but nonetheless it is a fix.<\/p>\n<p>If you want your hint back, there is only one way to do it:\u00a0Delete the volume and recreate it using a Mac that has the latest updates installed.<\/p>\n<p>The supplemental update also addresses an issue that allows an application or script to simulate a click on a keychain prompt, thus allowing it access to the stored passwords. This security flaw was discovered by Patrick Wardle \u2014 he\u00a0<a href=\"https:\/\/www.patreon.com\/posts\/14556409\" target=\"_blank\" rel=\"noopener\">wrote a proof-of-concept<\/a> application to demonstrate the vulnerability.<\/p>\n<p>These were two serious vulnerabilities, and makes for\u00a0a rocky start for\u00a0the new macOS High Sierra.\u00a0But with these vulnerabilities fixed by the supplemental update, High Sierra\u00a0is certainly an OS upgrade I still recommend.<\/p>\n<h3>How to Protect Your Mac<\/h3>\n<p>If macOS High Sierra shows your password instead of the password hint for an encrypted APFS volume, <a href=\"https:\/\/support.apple.com\/en-us\/HT208168\" target=\"_blank\">Apple has created a guide for Mac users<\/a> to follow and protect your data.<\/p>\n<p>The macOS High Sierra 10.13 Supplemental Update may be obtained from the Mac App Store or <a href=\"https:\/\/support.apple.com\/kb\/DL1937?locale=en_US\" target=\"_blank\">Apple&#8217;s Software Downloads<\/a> web site.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Two days after macOS High Sierra was released, a vulnerability was disclosed by Brazilian software developer, Matheus Mariano. The vulnerability shows Disk Utility displaying the actual passwords of encrypted volumes when the &#8220;Show Hint&#8221; button is clicked, rather than the expected password hint. Fortunately, to address this security flaw, Apple has just released\u00a0macOS High Sierra [&hellip;]<\/p>\n","protected":false},"author":79,"featured_media":55957,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[5],"tags":[3682,3679,3652],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<meta name=\"description\" content=\"Two days after macOS High Sierra was released, a vulnerability was disclosed by Brazilian software developer, Matheus Mariano. The vulnerability shows\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.intego.com\/mac-security-blog\/apple-issues-emergency-update-to-fix-disk-utility-bug-in-macos-high-sierra\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Apple Issues Emergency Update to Fix Disk Utility Bug in macOS High Sierra - The Mac Security Blog\" \/>\n<meta property=\"og:description\" content=\"Two days after macOS High Sierra was released, a vulnerability was disclosed by Brazilian software developer, Matheus Mariano. The vulnerability shows\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.intego.com\/mac-security-blog\/apple-issues-emergency-update-to-fix-disk-utility-bug-in-macos-high-sierra\/\" \/>\n<meta property=\"og:site_name\" content=\"The Mac Security Blog\" \/>\n<meta property=\"article:published_time\" content=\"2017-10-05T22:32:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2016\/08\/apple-security-update.png\" \/>\n\t<meta property=\"og:image:width\" content=\"400\" \/>\n\t<meta property=\"og:image:height\" content=\"260\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jay Vrijenhoek\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/#organization\",\"name\":\"Intego\",\"url\":\"https:\/\/www.intego.com\/mac-security-blog\/\",\"sameAs\":[],\"logo\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/#logo\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2022\/10\/intego-organization-logo-for-google-knowledge-graph-875x875-1.png\",\"contentUrl\":\"https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2022\/10\/intego-organization-logo-for-google-knowledge-graph-875x875-1.png\",\"width\":875,\"height\":875,\"caption\":\"Intego\"},\"image\":{\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/#logo\"}},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/#website\",\"url\":\"https:\/\/www.intego.com\/mac-security-blog\/\",\"name\":\"The Mac Security Blog\",\"description\":\"Keep Macs safe from the dangers of the Internet\",\"publisher\":{\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.intego.com\/mac-security-blog\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/apple-issues-emergency-update-to-fix-disk-utility-bug-in-macos-high-sierra\/#primaryimage\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2016\/08\/apple-security-update.png\",\"contentUrl\":\"https:\/\/www.intego.com\/mac-security-blog\/wp-content\/uploads\/2016\/08\/apple-security-update.png\",\"width\":400,\"height\":260,\"caption\":\"Apple security updates\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/apple-issues-emergency-update-to-fix-disk-utility-bug-in-macos-high-sierra\/#webpage\",\"url\":\"https:\/\/www.intego.com\/mac-security-blog\/apple-issues-emergency-update-to-fix-disk-utility-bug-in-macos-high-sierra\/\",\"name\":\"Apple Issues Emergency Update to Fix Disk Utility Bug in macOS High Sierra - The Mac Security Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.intego.com\/mac-security-blog\/apple-issues-emergency-update-to-fix-disk-utility-bug-in-macos-high-sierra\/#primaryimage\"},\"datePublished\":\"2017-10-05T22:32:01+00:00\",\"dateModified\":\"2017-10-05T22:32:01+00:00\",\"description\":\"Two days after macOS High Sierra was released, a vulnerability was disclosed by Brazilian software developer, Matheus Mariano. 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