{"id":874,"date":"2018-04-01T19:19:59","date_gmt":"2018-04-01T23:19:59","guid":{"rendered":"https:\/\/www.baronsoftware.com\/Blog\/?p=874"},"modified":"2018-04-01T19:19:59","modified_gmt":"2018-04-01T23:19:59","slug":"meltdown-patch-opened-bigger-security-hole-on-windows-7","status":"publish","type":"post","link":"https:\/\/www.baronsoftware.com\/Blog\/meltdown-patch-opened-bigger-security-hole-on-windows-7\/","title":{"rendered":"Meltdown Patch Opened Bigger Security Hole on Windows 7"},"content":{"rendered":"<p><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"738\" data-permalink=\"https:\/\/www.baronsoftware.com\/Blog\/microsoft-announces-new-startup-program-invest-500m-next-two-years\/cropped-baronsoftwarelogo_2018-fw_-1-png\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2018\/02\/cropped-BaronSoftwareLogo_2018.fw_-1.png?fit=474%2C98&amp;ssl=1\" data-orig-size=\"474,98\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"cropped-BaronSoftwareLogo_2018.fw_-1.png\" data-image-description=\"&lt;p&gt;https:\/\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2018\/02\/cropped-BaronSoftwareLogo_2018.fw_-1.png&lt;\/p&gt;\n\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2018\/02\/cropped-BaronSoftwareLogo_2018.fw_-1.png?fit=474%2C98&amp;ssl=1\" class=\"aligncenter size-medium wp-image-738\" src=\"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2018\/02\/cropped-BaronSoftwareLogo_2018.fw_-1.png?resize=300%2C62&#038;ssl=1\" alt=\"\" width=\"300\" height=\"62\" srcset=\"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2018\/02\/cropped-BaronSoftwareLogo_2018.fw_-1.png?resize=300%2C62&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2018\/02\/cropped-BaronSoftwareLogo_2018.fw_-1.png?w=474&amp;ssl=1 474w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<h3 style=\"text-align: center;\">Meltdown Patch Opened Bigger Security Hole on Windows 7<\/h3>\n<p>Microsoft&#8217;s Meltdown patch has opened an even bigger security hole on Windows 7, allowing any user-level application to read content from the operating system&#8217;s kernel, and even write data to kernel memory.<\/p>\n<p>Swedish IT security expert Ulf Frisk made the discovery earlier this month while working on\u00a0<a href=\"https:\/\/github.com\/ufrisk\/pcileech\" target=\"_blank\" rel=\"nofollow noopener\">PCILeech<\/a>, a device he created a few years back for carrying out Direct Memory Access (DMA) attacks and\u00a0dumping protected OS memory.<\/p>\n<p>Frisk says that Microsoft&#8217;s Meltdown patch (for CVE-2017-5754) \u2014released in the January 2018 Patch Tuesday\u2014 accidentally flipped a bit that controls the access permission for kernel memory. Frisk explains:<\/p>\n<p>In short &#8211; the User\/Supervisor permission bit was set to User in the PML4 self-referencing entry. This made the page tables available to user mode code in every process. The page tables should normally only be accessible by the kernel itself.<\/p>\n<p>The PML4 is the base of the 4-level in-memory page table hierarchy that the CPU Memory Management Unit (MMU) uses to translate the virtual addresses of a process into physical memory addresses in RAM.<\/p>\n<p>This issue affected only 64-bit versions of Windows 7 and Windows Server 2008 R2, Frisk said. We say affected because Microsoft patched the bug by flipping the PML4 permission bit back to its original value in this month&#8217;s Patch Tuesday.<\/p>\n<p>Windows 7 and Server 2008 R2 users should make sure they installed both the\u00a0January 2018\u00a0and\u00a0March 2018\u00a0Patch Tuesday releases.<\/p>\n<p>Windows 10 or 8.1 systems were never affected or put at risk. Physical access is required to exploit the bug Frisk found (and described on his blog,\u00a0here).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Meltdown Patch Opened Bigger Security Hole on Windows 7 Microsoft&#8217;s Meltdown patch has opened an even bigger security hole on Windows 7, allowing any user-level application to read content from the operating system&#8217;s kernel, and even write data to kernel memory. Swedish IT security expert Ulf Frisk made the discovery earlier this month while working [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4,3],"tags":[],"class_list":["post-874","post","type-post","status-publish","format-standard","hentry","category-microsoft-development","category-software-events"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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Dubbed \"Meltdown and Spectre\", these processor chip vulnerabilities are found on personal computers, mobile devices, and in the cloud. What is Meltdown Meltdown\u00a0exploits a flaw in out-of-order execution, a performance feature found in many modern processor chips.\u2026","rel":"","context":"In &quot;Computer PC Tips - bits and bytes&quot;","block_context":{"text":"Computer PC Tips - bits and bytes","link":"https:\/\/www.baronsoftware.com\/Blog\/category\/pc-tips-bits-bytes\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2018\/01\/download.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":677,"url":"https:\/\/www.baronsoftware.com\/Blog\/critical-sql-server-patches-meltdown-spectre\/","url_meta":{"origin":874,"position":1},"title":"Critical SQL Server Patches for Meltdown and Spectre","author":"richard@baronsoftware.com","date":"January 10, 2018","format":false,"excerpt":"Critical SQL Server Patches for Meltdown and Spectre There are two new possible viruses Meltdown and Spectre that can lead to dangerous situations on your SQL server by attacks. The following summary allows you to review and decide how to patch your systems.\u00a0 All SQL DBAs need to take action\u2026","rel":"","context":"In &quot;Microsoft Development&quot;","block_context":{"text":"Microsoft Development","link":"https:\/\/www.baronsoftware.com\/Blog\/category\/microsoft-development\/"},"img":{"alt_text":"Microsoft SQL Server 2016","src":"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2016\/03\/microsoft-sql-server-2016.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":772,"url":"https:\/\/www.baronsoftware.com\/Blog\/microsoft-outlook-affected-spectre-meltodown-bug\/","url_meta":{"origin":874,"position":2},"title":"Microsoft Outlook could be affected by the Spectre-Meltdown bug","author":"richard@baronsoftware.com","date":"February 16, 2018","format":false,"excerpt":"Microsoft Outlook could be affected by the Spectre-Meltdown bug The February updates address security flaws in Internet Explorer, Edge, Microsoft's ChakraCore JavaScript engine, Windows, and Office. Two worrying bugs fixed this month affected Outlook. One, a memory-corruption flaw, identified as CVE-2018-0852, could allow an attacker to run arbitrary code.\u00a0 \u00a0Microsoft\u2026","rel":"","context":"In &quot;Microsoft Development&quot;","block_context":{"text":"Microsoft Development","link":"https:\/\/www.baronsoftware.com\/Blog\/category\/microsoft-development\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2018\/02\/cropped-BaronSoftwareLogo_2018.fw_-1.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":660,"url":"https:\/\/www.baronsoftware.com\/Blog\/microsoft-releases-powershell-script-purpose-testing-meltdown-spectre\/","url_meta":{"origin":874,"position":3},"title":"Microsoft releases PowerShell script for purpose of testing of Meltdown and Spectre","author":"richard@baronsoftware.com","date":"January 8, 2018","format":false,"excerpt":"Microsoft releases PowerShell script for purpose of testing of Meltdown and Spectre With the latest news concerning the possible attacks within your computer hardware Microsoft has jumped on providing a PowerShell Script to give a user basic knowledge whether they are vulnerable.\u00a0 Baron Software followed the guidelines and can attest\u2026","rel":"","context":"In &quot;Computer PC Tips - bits and bytes&quot;","block_context":{"text":"Computer PC Tips - bits and bytes","link":"https:\/\/www.baronsoftware.com\/Blog\/category\/pc-tips-bits-bytes\/"},"img":{"alt_text":"PowerShell","src":"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2016\/10\/microsofts-logo-gets-a-makeover-300x225.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":531,"url":"https:\/\/www.baronsoftware.com\/Blog\/fixing-setup-errors-updating-installing-sap-crystal-reports-2016\/","url_meta":{"origin":874,"position":4},"title":"How to fix setup errors with SAP Crystal Reports 2016","author":"richard@baronsoftware.com","date":"September 7, 2017","format":false,"excerpt":"How to fix setup errors with SAP Crystal Reports 2016 It is always a small burden to install or execute the SAP Crystal Reports 2016 updates or service packs on a Windows 10 machine. \u00a0Things that just drive you crazy to put in a simple update or patch throws you\u2026","rel":"","context":"In &quot;Software development Concepts&quot;","block_context":{"text":"Software development Concepts","link":"https:\/\/www.baronsoftware.com\/Blog\/category\/software-development-concepts\/"},"img":{"alt_text":"SAP","src":"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2017\/09\/sap-lead-300x174.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":448,"url":"https:\/\/www.baronsoftware.com\/Blog\/2017-microsoft-product-roadmap\/","url_meta":{"origin":874,"position":5},"title":"The 2017 Microsoft Product Roadmap","author":"richard@baronsoftware.com","date":"February 22, 2017","format":false,"excerpt":"The 2017 Microsoft Product Roadmap The 2017 Microsoft Product Roadmap has been updated and released for the public to view what is going to be coming this year. \u00a0One large item is the MS SQL Server\u00a0release for Linux. \u00a0This alone may open the doors for Microsoft to take over the\u2026","rel":"","context":"In &quot;Software Events&quot;","block_context":{"text":"Software Events","link":"https:\/\/www.baronsoftware.com\/Blog\/category\/software-events\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2016\/02\/Microsoft.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/posts\/874","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/comments?post=874"}],"version-history":[{"count":1,"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/posts\/874\/revisions"}],"predecessor-version":[{"id":875,"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/posts\/874\/revisions\/875"}],"wp:attachment":[{"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/media?parent=874"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/categories?post=874"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.baronsoftware.com\/Blog\/wp-json\/wp\/v2\/tags?post=874"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}