{"id":51464,"date":"2023-04-14T15:28:07","date_gmt":"2023-04-14T15:28:07","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/34525\/Linux-Kernel-Logic-Allowed-Spectre-Attack-On-Major-Cloud-Provider.html"},"modified":"2023-04-14T15:28:07","modified_gmt":"2023-04-14T15:28:07","slug":"linux-kernel-logic-allowed-spectre-attack-on-major-cloud-provider","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/linux-kernel-logic-allowed-spectre-attack-on-major-cloud-provider\/","title":{"rendered":"Linux Kernel Logic Allowed Spectre Attack On Major Cloud Provider"},"content":{"rendered":"<p>The Spectre vulnerability that has haunted hardware and software makers since 2018 continues to defy efforts to bury it.<\/p>\n<p>On Thursday, Eduardo (sirdarckcat) Vela Nava, from Google&#8217;s product security response team, <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/github.com\/google\/security-research\/security\/advisories\/GHSA-mj4w-6495-6crx\">disclosed<\/a> a Spectre-related flaw in version 6.2 of the Linux kernel.<\/p>\n<p>The bug, designated medium severity, was initially reported to cloud service providers \u2013 those most likely to be affected \u2013 on December 31, 2022, and was <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/github.com\/torvalds\/linux\/commit\/6921ed9049bc7457f66c1596c5b78aec0dae4a9d\">patched in Linux on February 27, 2023<\/a>.<\/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=2ZDmFB8Jtju@4L@z7bZHG3gAAAMU&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=2ZDmFB8Jtju@4L@z7bZHG3gAAAMU&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>&#8220;The kernel failed to protect applications that attempted to protect against Spectre v2, leaving them open to attack from other processes running on the same physical core in another hyperthread,&#8221; the vulnerability disclosure explains. The consequence of that attack is potential information exposure (e.g., leaked private keys) through this pernicous problem.<\/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=44ZDmFB8Jtju@4L@z7bZHG3gAAAMU&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=44ZDmFB8Jtju@4L@z7bZHG3gAAAMU&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=33ZDmFB8Jtju@4L@z7bZHG3gAAAMU&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=33ZDmFB8Jtju@4L@z7bZHG3gAAAMU&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>The moniker <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/spectreattack.com\/spectre.pdf\">Spectre<\/a> [PDF] describes a set of vulnerabilities that abuse speculative execution, a processor performance optimization in which potential instructions are executed in advance to save time.<\/p>\n<p>It&#8217;s timing, however, that animates Spectre. Spectre v2 \u2013 the variant implicated in this particular vulnerability \u2013 relies on timing side-channels to measure the misprediction rates of indirect branch prediction in order to infer the contents of protected memory. That&#8217;s far from optimal in a cloud environment with shared hardware.<\/p>\n<p>Shortly after <em>The Register<\/em> <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2018\/01\/02\/intel_cpu_design_flaw\/\" rel=\"noopener\">first reported<\/a> on the scramble to fix the Meltdown and Spectre bugs, Intel published details about Indirect Branch Restricted Speculation (<a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/developer\/articles\/technical\/software-security-guidance\/technical-documentation\/indirect-branch-restricted-speculation.html\">IBRS<\/a>), a mechanism to restrict speculation of indirect branches, which tell processors to start executing instructions at a new location.<\/p>\n<p>IBRS offers <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/developer\/articles\/technical\/software-security-guidance\/advisory-guidance\/branch-target-injection.html\">a defense against Spectre v2<\/a>, which Intel calls Branch Target Injection. Branch Target Injection is a technique for training branch predictors to speculatively execute certain instructions in order to infer data in the processor cache using a timing side-channel.<\/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=44ZDmFB8Jtju@4L@z7bZHG3gAAAMU&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=44ZDmFB8Jtju@4L@z7bZHG3gAAAMU&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>IBRS comes in two flavors: basic (legacy) and enhanced. And it&#8217;s the basic flavor that proved distasteful from a security standpoint.<\/p>\n<p>The bug hunters who identified the issue found that Linux userspace processes to defend against Spectre v2 didn&#8217;t work on VMs of &#8220;at least one major cloud provider.&#8221;<\/p>\n<p>As the disclosure describes it, under basic IBRS, the <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/elixir.bootlin.com\/linux\/v6.2\/source\/arch\/x86\/kernel\/cpu\/bugs.c#L1196\">6.2 kernel had logic<\/a> that opted out of STIBP (Single Thread Indirect Branch Predictors), a defense against the sharing of branch prediction between logical processors on a core.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" id=\"story_eagle_xsm_sm_md_xmd_lg_xlg\" data-pos=\"mid\" data-raptor=\"eagle\" data-xsm=\",mpu,dmpu,\" data-sm=\",mpu,dmpu,\" data-md=\",mpu,dmpu,\" data-xmd=\",mpu,dmpu,\" data-lg=\",mpu,dmpu,\" data-xlg=\",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=33ZDmFB8Jtju@4L@z7bZHG3gAAAMU&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=33ZDmFB8Jtju@4L@z7bZHG3gAAAMU&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>&#8220;The IBRS bit implicitly protects against cross-thread branch target injection,&#8221; the bug report explains. &#8220;However, with legacy IBRS, the IBRS bit was cleared on returning to userspace, due to performance reasons, which disabled the implicit STIBP and left userspace threads vulnerable to cross-thread branch target injection against which STIBP protects.&#8221;<\/p>\n<p><em>The Register<\/em> understands that the issue arose from a misunderstanding of enhanced IBRS, which does not need STIBP to protect itself against another thread (simultaneous multithreading attacks).<\/p>\n<p>The fix removed basic IBRS from the <code>spectre_v2_in_ibrs_mode()<\/code> check, in order to keep STIBP on by default.<\/p>\n<p>The ghostly flaw was identified by Rodrigo Rubira Branco (BSDaemon), when he was at Google, and Jos\u00e9 Luiz. KP Singh, part of Google&#8217;s kernel team, who worked on the fix and coordinated with the Linux maintainers to resolve the issue.<\/p>\n<p>\u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/34525\/Linux-Kernel-Logic-Allowed-Spectre-Attack-On-Major-Cloud-Provider.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>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":[60],"tags":[10472],"class_list":["post-51464","post","type-post","status-publish","format-standard","hentry","category-packet-storm","tag-headlinemicrosoftlinuxamazonflawgoogleintel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Linux Kernel Logic Allowed Spectre Attack On Major 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