{"id":4930,"date":"2018-01-11T02:04:15","date_gmt":"2018-01-10T18:04:15","guid":{"rendered":"https:\/\/www.darknet.org.uk\/?p=4930"},"modified":"2018-01-11T02:05:30","modified_gmt":"2018-01-10T18:05:30","slug":"spectre-meltdown-checker-vulnerability-mitigation-tool-linux","status":"publish","type":"post","link":"https:\/\/www.darknet.org.uk\/2018\/01\/spectre-meltdown-checker-vulnerability-mitigation-tool-linux\/","title":{"rendered":"Spectre &#038; Meltdown Checker &#8211; Vulnerability Mitigation Tool For Linux"},"content":{"rendered":"<p>Spectre &#038; Meltdown Checker is a simple shell script to tell if your Linux installation is vulnerable against the 3 &#8220;speculative execution&#8221; CVEs that were made public early 2018.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.darknet.org.uk\/wp-content\/uploads\/2018\/01\/Spectre-Meltdown-Checker-Vulnerability-Mitigation-Tool-For-Linux-640x288.png\" alt=\"Spectre &amp; Meltdown Checker - Vulnerability Mitigation Tool For Linux\" width=\"640\" height=\"288\" class=\"aligncenter size-medium wp-image-4931\" srcset=\"https:\/\/www.darknet.org.uk\/wp-content\/uploads\/2018\/01\/Spectre-Meltdown-Checker-Vulnerability-Mitigation-Tool-For-Linux-640x288.png 640w, https:\/\/www.darknet.org.uk\/wp-content\/uploads\/2018\/01\/Spectre-Meltdown-Checker-Vulnerability-Mitigation-Tool-For-Linux.png 909w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/p>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3033787195489589\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- Darknet Responsive Post Ad Links [previously link ad unit] -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3033787195489589\"\r\n     data-ad-slot=\"5456620019\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<p>Without options, it&#8217;ll inspect you currently running kernel. You can also specify a kernel image on the command line, if you&#8217;d like to inspect a kernel you&#8217;re not running.<\/p>\n<p>The script will do its best to detect mitigations, including backported non-vanilla patches, regardless of the advertised kernel version number.<\/p>\n<h2>Summary of the CVEs in Spectre &#038; Meltdown Checker<\/h2>\n<h4>CVE-2017-5753 bounds check bypass (Spectre Variant 1)<\/h4>\n<ul>\n<li>Impact: Kernel &#038; all software<\/li>\n<li>Mitigation: recompile software and kernel with a modified compiler that introduces the LFENCE opcode at the proper positions in the resulting code<\/li>\n<li>Performance impact of the mitigation: negligible<\/li>\n<\/ul>\n<h4>CVE-2017-5715 branch target injection (Spectre Variant 2)<\/h4>\n<ul>\n<li>Impact: Kernel<\/li>\n<li>Mitigation 1: new opcode via microcode update that should be used by up to date compilers to protect the BTB (by flushing indirect branch predictors)<\/li>\n<li>Mitigation 2: introducing &#8220;retpoline&#8221; into compilers, and recompile software\/OS with it<\/li>\n<li>Performance impact of the mitigation: high for mitigation 1, medium for mitigation 2, depending on your CPU<\/li>\n<\/ul>\n<h4>CVE-2017-5754 rogue data cache load (Meltdown)<\/h4>\n<ul>\n<li>Impact: Kernel<\/li>\n<li>Mitigation: updated kernel (with PTI\/KPTI patches), updating the kernel is enough<\/li>\n<li>Performance impact of the mitigation: low to medium<\/li>\n<\/ul>\n<p>There are some other more generic BASH scripts for security scanning like:<\/p>\n<p>&#8211; <a href=\"https:\/\/www.darknet.org.uk\/2015\/06\/unix-privesc-check-unixlinux-user-privilege-escalation-scanner\/\">unix-privesc-check \u2013 Unix\/Linux User Privilege Escalation Scanner<\/a><br \/>\n&#8211; <a href=\"https:\/\/www.darknet.org.uk\/2014\/11\/linenum-linux-enumeration-privilege-escalation-tool\/\">LinEnum \u2013 Linux Enumeration &#038; Privilege Escalation Tool<\/a><\/p>\n<p>You can download Spectre &#038; Meltdown Checker here:<\/p>\n<p><a href=\"https:\/\/raw.githubusercontent.com\/speed47\/spectre-meltdown-checker\/master\/spectre-meltdown-checker.sh\">spectre-meltdown-checker.sh<\/a><\/p>\n<p>Or read more <a href=\"https:\/\/github.com\/speed47\/spectre-meltdown-checker\">here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Spectre &#038; Meltdown Checker is a simple shell script to tell if your Linux installation is vulnerable against the 3 &#8220;speculative execution&#8221; CVEs that were made public early 2018. Without options, it&#8217;ll inspect you currently running kernel. You can also specify a kernel image on the command line, if you&#8217;d like to inspect a kernel [&hellip;]<\/p>\n","protected":false},"author":25,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"Spectre & Meltdown Checker is a simple shell script to tell if your Linux installation is vulnerable against the 3 \"speculative execution\" CVEs that were made public early 2018.","_seopress_robots_index":"","_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[11],"tags":[10665,10664],"featured_image_src":null,"featured_image_src_square":null,"author_info":{"display_name":"Darknet","author_link":"https:\/\/www.darknet.org.uk\/author\/darknet\/"},"_links":{"self":[{"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/posts\/4930"}],"collection":[{"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/users\/25"}],"replies":[{"embeddable":true,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/comments?post=4930"}],"version-history":[{"count":0,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/posts\/4930\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/media?parent=4930"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/categories?post=4930"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/tags?post=4930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}