{"id":45625,"date":"2022-03-08T15:01:21","date_gmt":"2022-03-08T15:01:21","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/33188\/Linux-Has-Been-Bitten-By-Its-Most-High-Severity-Bug-In-Years.html"},"modified":"2022-03-08T15:01:21","modified_gmt":"2022-03-08T15:01:21","slug":"linux-has-been-bitten-by-its-most-high-severity-bug-in-years","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/linux-has-been-bitten-by-its-most-high-severity-bug-in-years\/","title":{"rendered":"Linux Has Been Bitten By Its Most High Severity Bug In Years"},"content":{"rendered":"<figure class=\"intro-image intro-left\"> <img decoding=\"async\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/03\/shark-0-1-800x711.jpeg\" alt=\"Fanciful illustration of a shark attacking ones and zeroes.\"><figcaption class=\"caption\"><\/figcaption><\/figure>\n<aside id=\"social-left\" class=\"social-left\" aria-label=\"Read the comments or share this article\"> <a title=\"96 posters participating\" class=\"comment-count icon-comment-bubble-down\" href=\"https:\/\/arstechnica.com\/information-technology\/2022\/03\/linux-has-been-bitten-by-its-most-high-severity-vulnerability-in-years\/?comments=1\"> <\/p>\n<h4 class=\"comment-count-before\">reader comments<\/h4>\n<p> <span class=\"comment-count-number\">145<\/span> <span class=\"visually-hidden\"> with 96 posters participating<\/span> <\/a> <\/p>\n<div class=\"share-links\">\n<h4>Share this story<\/h4>\n<\/p><\/div>\n<\/aside>\n<p> <!-- cache hit 759:single\/related:a51a3bba47935a03f05941e1b843eed1 --><!-- empty --><\/p>\n<p>Linux has yet another high-severity vulnerability that makes it easy for untrusted users to execute code capable of carrying out a host of malicious actions, including installing backdoors, creating unauthorized user accounts, and modifying scripts or binaries used by privileged services or apps.<\/p>\n<p>Dirty Pipe, as the vulnerability has been named, is among the most serious Linux threats to be disclosed since 2016, the year another high-severity and easy-to-exploit Linux flaw (named Dirty Cow) <a href=\"https:\/\/arstechnica.com\/information-technology\/2016\/10\/most-serious-linux-privilege-escalation-bug-ever-is-under-active-exploit\/\">came to light<\/a> as it was being used to hack a researcher&#8217;s server. Researchers in 2016 demonstrated how to exploit Dirty Cow to <a href=\"https:\/\/arstechnica.com\/information-technology\/2016\/10\/android-phones-rooted-by-most-serious-linux-escalation-bug-ever\/\">root any Android phone<\/a>, regardless of the mobile OS version. Eleven months later, researchers unearthed 1,200 Android apps in third-party markets that <a href=\"https:\/\/arstechnica.com\/information-technology\/2017\/09\/in-a-first-android-apps-abuse-serious-dirty-cow-bug-to-backdoor-phones\/\">maliciously exploited<\/a> the flaw to do just that.<\/p>\n<h2>When nobody becomes all-powerful<\/h2>\n<p>The name &#8220;Dirty Pipe&#8221;: is meant to both signal similarities to Dirty Cow and provide clues about the new vulnerability&#8217;s origins. &#8220;Pipe&#8221; refers to a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Pipeline_(Unix)\">pipeline<\/a>, a Linux mechanism for one OS process to send data to another process. In essence, a pipeline is two or more processes that are chained together so that the output text of one process (stdout) is passed directly as input (stdin) to the next one.<\/p>\n<p>Tracked as CVE-2022-0847, the vulnerability came to light when a researcher for website builder CM4all was troubleshooting a series of corrupted files that kept appearing on a customer&#8217;s Linux machine. After months of analysis, the researcher finally found that the customer&#8217;s corrupted files were the result of a bug in the Linux kernel.<\/p>\n<aside class=\"ad_wrapper\" aria-label=\"In Content advertisement\"> <span class=\"ad_notice\">Advertisement <\/span> <\/aside>\n<p>The researcher\u2014Max Kellermann of CM4all parent company Ionos\u2014eventually figured out how to weaponize the vulnerability to allow anyone with an account\u2014including the least-privileged &#8220;nobody&#8221; accounts\u2014to add an SSH key to the root user&#8217;s account. With that, the untrusted user could remotely access the server with an SSH window that has full root privileges.<\/p>\n<figure class=\"image shortcode-img center large\"><a href=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/03\/dirty-pipe-poc.png\" class=\"enlarge\" data-height=\"770\" data-width=\"1393\" alt=\"Comments included with Kellermann's PoC.\"><img loading=\"lazy\" decoding=\"async\" alt=\"Comments included with Kellermann's PoC.\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/03\/dirty-pipe-poc-640x354.png\" width=\"640\" height=\"354\" srcset=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/03\/dirty-pipe-poc-1280x708.png 2x\"><\/a><figcaption class=\"caption\">\n<div class=\"caption-text\"><a href=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/03\/dirty-pipe-poc.png\" class=\"enlarge-link\" data-height=\"770\" data-width=\"1393\">Enlarge<\/a> <span class=\"sep\">\/<\/span> Comments included with Kellermann&#8217;s PoC.<\/div>\n<\/figcaption><\/figure>\n<p>Other researchers quickly showed that the unauthorized creation of an SSH key was only one of many malicious actions an attacker can take when exploiting the vulnerability. This <a href=\"https:\/\/haxx.in\/files\/dirtypipez.c\">program<\/a>, for instance, hijacks an SUID binary to create a root shell, while <a href=\"https:\/\/twitter.com\/nopsIide\/status\/1500890455323856896\">this one<\/a> allows untrusted users to overwrite data in read-only files:<\/p>\n<p>Other malicious actions enabled by Dirty Pipe include creating a <a href=\"https:\/\/www.hostinger.com\/tutorials\/cron-job\">cron job<\/a> that runs as a backdoor, adding a new user account to \/etc\/passwd + \/etc\/shadow (giving the new account root privileges), or modifying a script or binary used by a privileged service.<\/p>\n<p>&#8220;It&#8217;s about as severe as it gets for a local kernel vulnerability,&#8221; Brad Spengler, president of Open Source Security, wrote in an email. &#8220;Just like Dirty Cow, there&#8217;s essentially no way to mitigate it, and it involves core Linux kernel functionality.&#8221;<\/p>\n<p>The vulnerability first appeared in Linux kernel <a href=\"https:\/\/lore.kernel.org\/lkml\/CAHk-=wj+mDPbj8hXspXRAksh+1TmPjubc9RNEbu8EVpYyypX=w@mail.gmail.com\/\">version 5.8<\/a>, which was released in August 2020. The vulnerability persisted until last month, when it was <a href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=9d2231c5d74e13b2a0546fee6737ee4446017903\">fixed<\/a> with the release of versions 5.16.11, 5.15.25, and 5.10.102.<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/33188\/Linux-Has-Been-Bitten-By-Its-Most-High-Severity-Bug-In-Years.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":45626,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[3707],"class_list":["post-45625","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlinelinuxflaw"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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