{"id":51917,"date":"2023-05-15T22:18:54","date_gmt":"2023-05-15T22:18:54","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/intel-says-fridays-mystery-security-update-microcode-isnt-really-a-security-update\/"},"modified":"2023-05-15T22:18:54","modified_gmt":"2023-05-15T22:18:54","slug":"intel-says-fridays-mystery-security-update-microcode-isnt-really-a-security-update","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/intel-says-fridays-mystery-security-update-microcode-isnt-really-a-security-update\/","title":{"rendered":"Intel says Friday&#8217;s mystery &#8216;security update&#8217; microcode isn&#8217;t really a security update"},"content":{"rendered":"<p>False alarm: despite a patch notes suggesting otherwise, that mysterious blob of microcode released for many Intel microprocessors last week was not a security update, the x86 giant says.<\/p>\n<p>In an email Monday, an Intel spokesperson told <em>The Register<\/em> that microcode-20230512, which popped up on the manufacturer&#8217;s <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/github.com\/intel\/Intel-Linux-Processor-Microcode-Data-Files\/releases\/tag\/microcode-20230512\">GitHub page<\/a> \u201cdoes not contain any security updates and the note, [INTEL-SA-NA], is meant to convey that there are no applicable (Not Applicable) security updates in the package.\u201d<\/p>\n<p>The update caught many users <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.reddit.com\/r\/linux\/comments\/13fzkr3\/intel_issues_new_cpu_microcode_going_back_to_gen8\/\">attention<\/a> over the weekend as it affected nearly every Intel CPU going back to 2017. This includes most of Intel\u2019s latest chips, such as its 13th-gen Core-series parts and 4th-Gen Xeon Scalable datacenter parts.<\/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\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZGK8cE68Mdhc-zx6mhMmiAAAAFI&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\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZGK8cE68Mdhc-zx6mhMmiAAAAFI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Unfortunately, Intel isn\u2019t being forthcoming about what exactly the patch does. Its purpose was simply listed as \u201csecurity updates for Intel-SA-NA,\u201d which many, including <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.phoronix.com\/news\/Intel-12-May-2023-Microcode\">Phoronix<\/a>, took to the NA to mean it was a security update with a release advisory \u201cnot available.\u201d We now know it meant \u201cnot applicable,\u201d and that the update simply contains \u201cfunctional updates.\u201d<\/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\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZGK8cE68Mdhc-zx6mhMmiAAAAFI&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\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZGK8cE68Mdhc-zx6mhMmiAAAAFI&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\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZGK8cE68Mdhc-zx6mhMmiAAAAFI&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\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZGK8cE68Mdhc-zx6mhMmiAAAAFI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p><em>The Register<\/em> has asked out Intel for additional information on what these updates entail, and we&#8217;ll let you know when the silicon slinger is ready to talk.<\/p>\n<p>It\u2019s also unclear whether Intel chose not to patch older parts, or if they\u2019re not affected. We\u2019ll note that Microsoft Windows 11 doesn\u2019t support Intel processors older than 8th-gen, so that may be part of the reasoning behind the deployment.<\/p>\n<p>Microcode releases aren\u2019t uncommon, can address and improve all kinds of low-level operations in modern processors, and can include mitigations for chip-level vulnerabilities. However, they\u2019ve become a point of concern for many customers, as these sorts of security fixes can have a severe impact on performance.<\/p>\n<p>For instance, the Spectre and Meltdown side-channel weaknesses we <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2021\/06\/22\/spectre_linux_performance_test_analysis\/\" rel=\"noopener\">exposed<\/a> back in early 2018 could be exploited by rogue software or insiders to extract sensitive information, such as cryptographic keys and authentication tokens, from memory that should otherwise be out of reach. Intel released patches for affected CPU cores, though the cure wasn\u2019t always without side effects; some of the updates could hit performance dramatically or not, depending on what you&#8217;re running and whether other mitigations were in place.<\/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\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZGK8cE68Mdhc-zx6mhMmiAAAAFI&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\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZGK8cE68Mdhc-zx6mhMmiAAAAFI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>In any case, last week\u2019s mystery microcode is already making its way out to Linux users \u2014 many distros will apply them as part of their security updates \u2014 while we anticipate the release will find its way out to Windows and Mac users before long.<\/p>\n<p>Intel\u2019s comments would seem to rule out any connection to the <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2023\/05\/09\/intel_oem_private_keys_leaked\/\" rel=\"noopener\">leak<\/a> of BootGuard private OEM keys alongside a treasure trove of data <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2023\/04\/07\/msi_cyberattack_bios\/\" rel=\"noopener\">stolen<\/a> from MSI back in April.<\/p>\n<p>In a nutshell, these keys ensure that only signed firmware releases can be applied to a system, preventing an attacker from injecting malicious code before the OS boots. With these keys now out in the wild, it\u2019s technically possible for an attacker to sign their malware so it appears legitimate. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2023\/05\/15\/intel_mystery_microcode\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We&#8217;re all for encouraging people to squash bugs but this is an odd way to do it False alarm: despite a patch notes suggesting otherwise, that mysterious blob of microcode released for many Intel microprocessors last week was not a security update, the x86 giant says.\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-51917","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Intel says Friday&#039;s mystery &#039;security update&#039; 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