{"id":43058,"date":"2021-09-22T23:07:12","date_gmt":"2021-09-22T23:07:12","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/apple-tried-to-patch-this-security-hole-in-macos-finder-but-didnt-consider-upper-and-lowercase-characters\/"},"modified":"2021-09-22T23:07:12","modified_gmt":"2021-09-22T23:07:12","slug":"apple-tried-to-patch-this-security-hole-in-macos-finder-but-didnt-consider-upper-and-lowercase-characters","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/apple-tried-to-patch-this-security-hole-in-macos-finder-but-didnt-consider-upper-and-lowercase-characters\/","title":{"rendered":"Apple tried to patch this security hole in macOS Finder but didn&#8217;t consider upper and lowercase characters"},"content":{"rendered":"<p>Apple&#8217;s macOS Finder application is currently vulnerable to a remote code execution bug, despite an apparent attempt to fix the problem.<\/p>\n<p>A <a href=\"https:\/\/ssd-disclosure.com\/ssd-advisory-macos-finder-rce\/\" target=\"_blank\" rel=\"nofollow noopener\">security advisory<\/a> published Tuesday by the SSD Secure Disclosure program, on behalf of researcher Park Minchan, explains that macOS Finder \u2013 which provides a visual interface for interacting with files \u2013 is vulnerable to documents with the <code>.inetloc<\/code> extension.<\/p>\n<p>&#8220;[T]hese files can be embedded inside emails which if the user clicks on them will execute the commands embedded inside them without providing a prompt or warning to the user,&#8221; the advisory says.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2YVBeq6opSc0cCn-NEqG2VgAAAEw&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2YVBeq6opSc0cCn-NEqG2VgAAAEw&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The files can also execute commands if downloaded and double-clicked. In theory, Apple&#8217;s macOS security mechanisms Quarantine \u2013 for preventing downloads from launching without user action \u2013 and Gatekeeper \u2013 to enforce code signing \u2013 should prevent such problems.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YVBeq6opSc0cCn-NEqG2VgAAAEw&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YVBeq6opSc0cCn-NEqG2VgAAAEw&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YVBeq6opSc0cCn-NEqG2VgAAAEw&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YVBeq6opSc0cCn-NEqG2VgAAAEw&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>But when <i>The Register<\/i> tested the PoC file on macOS Big Sur (version 11.6), it executed without any warning. According to security researcher Patrick Wardle, the PoC code <a href=\"https:\/\/twitter.com\/patrickwardle\/status\/1440381457008975877?s=20\" target=\"_blank\" rel=\"nofollow noopener\">bypasses<\/a> both of those mechanisms.<\/p>\n<p>Apple&#8217;s operating system software was affected by <a href=\"https:\/\/support.apple.com\/en-us\/HT3865\" target=\"_blank\" rel=\"nofollow noopener\">a similar flaw<\/a> (<a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2009-2811\" target=\"_blank\" rel=\"nofollow noopener\">CVE-2009-2811<\/a>) more than a decade ago with the <code>.fileloc<\/code> extension in Mac OS X 10.5.8.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YVBeq6opSc0cCn-NEqG2VgAAAEw&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YVBeq6opSc0cCn-NEqG2VgAAAEw&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The <code>.inetloc<\/code> file extension appears to date back to around 2004 but isn&#8217;t well documented. Apple&#8217;s own developer website <a href=\"https:\/\/developer.apple.com\/search\/?q=inetloc\" target=\"_blank\" rel=\"nofollow noopener\">doesn&#8217;t recognize the term<\/a>. Nonetheless macOS sees such files <a href=\"https:\/\/www.file-extension.org\/extensions\/inetloc\" target=\"_blank\" rel=\"nofollow noopener\">as Internet locations<\/a>.<\/p>\n<p>According to the advisory, <code>.inetloc<\/code> files serve as shortcuts to Internet resources like an RSS feed or a telnet location and may include a server address and possibly login credentials for SSH or telnet sessions. They can be created by typing a URL in a text editor and dragging the text to the macOS Desktop, if the format and drag-and-drop are supported within the app.<\/p>\n<p>Here&#8217;s what the PoC file, <code>inetloc.inetloc<\/code> for lack of a better name, looks like. If opened in macOS, it will launch the macOS Calculator app.<\/p>\n<pre class=\"wrap_text\">\n&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;\n&lt;!DOCTYPE plist PUBLIC \"-\/\/Apple\/\/DTD PLIST 1.0\/\/EN\" \"http:\/\/www.apple.com\/DTDs\/PropertyList-1.0.dtd\"&gt;\n&lt;plist version=\"1.0\"&gt; &lt;dict&gt; &lt;key&gt;URL&lt;\/key&gt; &lt;string&gt;FiLe:\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/System\/Applications\/Calculator.app&lt;\/string&gt; &lt;\/dict&gt;\n&lt;\/plist&gt;\n<\/pre>\n<p>The advisory says Apple told the SSD Disclosure Program that newer versions of macOS, from Big Sur onward, have blocked the <code>file:\/\/<\/code> prefix with a check in <code>com.apple.generic-internet-location<\/code>. But Apple&#8217;s engineers evidently failed to consider upper and lower case variations, so alternative renditions of the file handler like <code>File:\/\/<\/code> or <code>fIle:\/\/<\/code> still bypass the check.<\/p>\n<p>&#8220;We have notified Apple that <code>FiLe:\/\/<\/code> (just mangling the value) doesn\u2019t appear to be blocked, but have not received any response from them since the report has been made,&#8221; the advisory says. &#8220;As far as we know, at the moment, the vulnerability has not been patched.&#8221;<\/p>\n<p><i>The Register<\/i> asked Apple for comment knowing it&#8217;s futile to do so. Our lack of faith has been vindicated by the lack of response. For those keeping score, it&#8217;s been <a href=\"https:\/\/www.theregister.com\/2021\/05\/13\/apple_antonio_garcia_martinez_petition\/\" target=\"_blank\" rel=\"noopener\">four months<\/a> since Apple comms last provided proof of life by responding to a query. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2021\/09\/22\/macos_rce_flaw\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>file:\/\/ is blocked? Oh OK, we&#8217;ll just use File:\/\/ or fiLE:\/\/&#8230; Apple&#8217;s macOS Finder application is currently vulnerable to a remote code execution bug, despite an apparent attempt to fix the problem.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-43058","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Apple tried to patch this security hole in macOS Finder but didn&#039;t consider upper and lowercase characters 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber 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