{"id":42330,"date":"2021-08-13T07:35:06","date_gmt":"2021-08-13T07:35:06","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/re-volting-amd-secure-encrypted-virtualization-undone-by-electrical-attack\/"},"modified":"2021-08-13T07:35:06","modified_gmt":"2021-08-13T07:35:06","slug":"re-volting-amd-secure-encrypted-virtualization-undone-by-electrical-attack","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/re-volting-amd-secure-encrypted-virtualization-undone-by-electrical-attack\/","title":{"rendered":"Re-volting: AMD Secure Encrypted Virtualization undone by electrical attack"},"content":{"rendered":"<p>AMD&#8217;s Secure Encrypted Virtualization (SEV) scheme is not as secure as its name suggests.<\/p>\n<p>Boffins from the Technische Universit\u00e4t Berlin have devised an attack that defeats the primary purpose of this silicon safe room technology: protecting the data in virtual machines from rogue administrators in cloud environments.<\/p>\n<p>In <a href=\"https:\/\/arxiv.org\/abs\/2108.04575\" target=\"_blank\" rel=\"nofollow noopener\">a paper<\/a> titled &#8220;One Glitch to Rule Them All: Fault Injection Attacks Against AMD\u2019s Secure Encrypted Virtualization,&#8221; Robert Buhren, Hans Niklas Jacob, Thilo Krachenfels, and Jean-Pierre Seifert from TU Berlin&#8217;s Security in Telecommunications group, describe how they succeeded in mounting a voltage fault injection attack.<\/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=2YRiWJaFSV4tnblsw-cbSWQAAAMo&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=2YRiWJaFSV4tnblsw-cbSWQAAAMo&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>This shock to the system allowed them to recover secret encryption keys and execute arbitrary code on all AMD chips with Secure Processors (SP).<\/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=44YRiWJaFSV4tnblsw-cbSWQAAAMo&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=44YRiWJaFSV4tnblsw-cbSWQAAAMo&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=33YRiWJaFSV4tnblsw-cbSWQAAAMo&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=33YRiWJaFSV4tnblsw-cbSWQAAAMo&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>&#8220;By manipulating the input voltage to AMD systems on a chip (SoCs), we induce an error in the read-only memory (ROM) bootloader of the AMD-SP, allowing us to gain full control over this root-of-trust,&#8221; the researchers explain in their paper.<\/p>\n<p>The attack was inspired by a separate cunning plan, dubbed <a href=\"https:\/\/www.theregister.com\/2020\/11\/14\/intel_sgx_physical_security\/\" target=\"_blank\" rel=\"noopener\">Voltpillager<\/a>, used to defeat Intel&#8217;s Software Guard Extensions (SGX), a similar secure enclave system for x86 microarchitecture.<\/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=44YRiWJaFSV4tnblsw-cbSWQAAAMo&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=44YRiWJaFSV4tnblsw-cbSWQAAAMo&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>As with SGX, the SEV attack relies on cheap, off-the-shelf components: a ~$30 Teensy \u00b5Controller (microcontroller) and a $12 flash programmer. Non-material prerequisites pose more of a challenge \u2013 they include insider access at a cloud company, an opportunity to attach wires to the server motherboard without arousing suspicion, and some technical proficiency.<\/p>\n<p><i>The Register<\/i> asked AMD to comment. A spokesperson pointed to the physical access requirement to underscore this is not a remote attack scenario but otherwise didn&#8217;t have anything to say.<\/p>\n<p>SEV utilizes the Secure Processor, a microcontroller that provides the root of trust in AMD Naples (Zen 1), Rome (Zen 2), and Milan (Zen 3) chips and manages the VM lifecycle. It is supposed to protect VM data from the hypervisor and from other VMs.<\/p>\n<p>But by lowering the voltage applied when the AMD-SP&#8217;s ROM bootloader runs, the researchers were able to extract Chip Endorsement Keys (CEKs), which can be used to mount fully remote attacks.<\/p>\n<p>The boffins were also able to defeat a new key-versioning scheme introduced by the SEV Secure Nested Paging (SEV-SNP) extension last year [<a href=\"https:\/\/www.amd.com\/system\/files\/TechDocs\/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf\" target=\"_blank\" rel=\"nofollow noopener\">PDF<\/a>]. Using the electrical glitch to extract the seed values for the Versioned Chip Endorsement Key (VCEK), they were able to derive the valid VCEKs for all possible combinations of firmware versions. This represents the first publicly disclosed attack on the SEV-SNP extension, they claim.<\/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=33YRiWJaFSV4tnblsw-cbSWQAAAMo&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=33YRiWJaFSV4tnblsw-cbSWQAAAMo&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The paper suggest two possible mitigation paths. One involves modifying software or hardware to detect voltage modulation in order to prevent execution in the presence of faults.<\/p>\n<p>The other involves the addition of specific circuitry to defend against voltage glitches. The researchers observe that this is already routine for smartcards and point to a recent <a href=\"https:\/\/patents.google.com\/patent\/US20200285780A1\/en\" target=\"_blank\" rel=\"nofollow noopener\">Nvidia patent<\/a> for a cross-domain voltage glitch detection circuit that can be implemented in an SoC. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2021\/08\/13\/amd_secure_encrypted_virtualization\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fault injection technique presents risk in cloud environments from rogue admins AMD&#8217;s Secure Encrypted Virtualization (SEV) scheme is not as secure as its name suggests.\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-42330","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Re-volting: AMD Secure Encrypted Virtualization undone by electrical attack 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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