{"id":123472,"date":"2025-04-11T15:05:18","date_gmt":"2025-04-11T13:05:18","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/cpu-amd-zen-5-podverzheny-uyazvimosti-dopuskayushhej-izmenenie-mikrokoda-i-obhod-izolyaczii-sev-snp"},"modified":"2025-04-11T15:05:18","modified_gmt":"2025-04-11T13:05:18","slug":"cpu-amd-zen-5-podverzheny-uyazvimosti-dopuskayushhej-izmenenie-mikrokoda-i-obhod-izolyaczii-sev-snp","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/cpu-amd-zen-5-podverzheny-uyazvimosti-dopuskayushhej-izmenenie-mikrokoda-i-obhod-izolyaczii-sev-snp","title":{"rendered":"AMD Zen 5 CPU-k s\u00e9r\u00fcl\u00e9kenyek, amelyek lehet\u0151v\u00e9 teszik a mikrok\u00f3d m\u00f3dos\u00edt\u00e1s\u00e1t \u00e9s a SEV-SNP izol\u00e1ci\u00f3 megker\u00fcl\u00e9s\u00e9t.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Az AMD bevezette a Zen 5 mikroarchitekt\u00far\u00e1ra \u00e9p\u00fcl\u0151 processzorokat az EntrySign s\u00e9r\u00fcl\u00e9kenys\u00e9g \u00e1ltal \u00e9rintett term\u00e9kek list\u00e1j\u00e1ra, amely lehet\u0151v\u00e9 teszi a digit\u00e1lis al\u00e1\u00edr\u00e1s ellen\u0151rz\u00e9si mechanizmus\u00e1nak megker\u00fcl\u00e9s\u00e9t a mikrok\u00f3d friss\u00edt\u00e9sekor. Eredetileg \u00fagy gondolt\u00e1k, hogy a s\u00e9r\u00fcl\u00e9kenys\u00e9g csak az 1\u20134. gener\u00e1ci\u00f3s Zen architekt\u00far\u00e1ra \u00e9p\u00fcl\u0151 AMD CPU-kat \u00e9rinti. \u00cdgy a s\u00e9r\u00fcl\u00e9kenys\u00e9g alkalmazhat\u00f3 olyan processzorokra, mint a Ryzen 9000 (Granite Ridge), EPYC 9005 (Turin), Ryzen AI 300 (Strix Halo, Strix Point, Krackan Point) \u00e9s a Ryzen 9000HX (Fire Range).     <\/p>\n<p>A mikrok\u00f3d friss\u00edt\u00e9se mellett a SEV-SNP hiteles\u00edt\u00e9st haszn\u00e1l\u00f3 rendszerek eset\u00e9ben az AMD SEV firmware friss\u00edt\u00e9se is sz\u00fcks\u00e9ges a s\u00e9r\u00fcl\u00e9kenys\u00e9g megsz\u00fcntet\u00e9s\u00e9hez, amely BIOS-friss\u00edt\u00e9sek r\u00e9szek\u00e9nt ker\u00fcl kiad\u00e1sra. Az AMD \u00e1ll\u00edt\u00f3lag m\u00f3dos\u00edtott firmware-t (ComboAM5PI 1.2.0.3c AGESA) adott \u00e1t a hardvergy\u00e1rt\u00f3knak a probl\u00e9ma megold\u00e1s\u00e1ra, de a v\u00e9gfelhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra el\u00e9rhet\u0151 BIOS-friss\u00edt\u00e9sek hetekkel vagy h\u00f3napokkal k\u00e9s\u0151bb \u00e9rkezhetnek a gy\u00e1rt\u00f3kt\u00f3l.     <\/p>\n<p>Az AMD munkat\u00e1rsai javasoltak egy patchet a Linux kernelbe, amely blokkolja a nem hivatalos mikrok\u00f3d-friss\u00edt\u00e9sek bet\u00f6lt\u00e9s\u00e9t (megjegyzend\u0151, hogy a helyes mikrok\u00f3d-friss\u00edt\u00e9seket a hardvergy\u00e1rt\u00f3 BIOS-\u00e1val egy\u00fctt kell telep\u00edteni, de m\u00e1r megjelentek a nem hivatalos jav\u00edt\u00f3csomagok elk\u00e9sz\u00edt\u00e9s\u00e9re tett k\u00eds\u00e9rletek, amelyek a BIOS-b\u00f3l kiv\u00e1gott mikrok\u00f3d-fragmentumokon alapulnak). A felhaszn\u00e1l\u00f3knak azt aj\u00e1nlj\u00e1k, hogy v\u00e1rj\u00e1k meg a hivatalos BIOS-friss\u00edt\u00e9seket.    <\/p>\n<p>Az EntrySign s\u00e9r\u00fcl\u00e9kenys\u00e9g \u00e1ltal ny\u00fajtott mikrok\u00f3d megv\u00e1ltoztat\u00e1s\u00e1nak lehet\u0151s\u00e9ge lehet\u0151s\u00e9get ad az AMD SEV (Secure Encrypted Virtualization) mechanizmus\u00e1nak kompromitt\u00e1l\u00e1s\u00e1ra, amelyet virtualiz\u00e1ci\u00f3s rendszerek v\u00e9delm\u00e9re haszn\u00e1lnak. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/vps\/\"   title=\"virtu\u00e1lis g\u00e9pekhez\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2018\">virtu\u00e1lis g\u00e9pekhez<\/a> a hypervisor vagy a hosztrendszer adminisztr\u00e1tora \u00e1ltali beavatkoz\u00e1st\u00f3l. A t\u00e1mad\u00e1s sor\u00e1n be lehet f\u00farni magunkat a AMD SEV (Secure Encrypted Virtualization) \u00e9s SEV-SNP (Secure Nested Paging) kiterjeszt\u00e9sek v\u00e9dettebb vend\u00e9g rendszereinek m\u0171k\u00f6d\u00e9s\u00e9be, amelyek garant\u00e1lj\u00e1k a virtu\u00e1lis g\u00e9pek mem\u00f3ria integrit\u00e1s\u00e1t, elszigetelik a processzorregisztereket, \u00e9s biztos\u00edtj\u00e1k a biztons\u00e1gos munk\u00e1t a be\u00e1gyazott mem\u00f3riaoldalt\u00e1bl\u00e1kkal.     <\/p>\n<p>A sebezhet\u0151s\u00e9g a CMAC hiteles\u00edt\u00e9si algoritmus mikrok\u00f3dj\u00e1nak ellen\u0151rz\u00e9s\u00e9n\u00e9l megb\u00edzhat\u00f3 hash-funkci\u00f3 haszn\u00e1lata helyett a z\u00e1rt RSA kulcs alkalmaz\u00e1s\u00e1b\u00f3l fakad, amely az AMD c\u00e9g \u00e1ltal sz\u00e1rmaztatott digit\u00e1lis al\u00e1\u00edr\u00e1st biztos\u00edtja a processzorba t\u00f6lt\u00f6tt mikrok\u00f3d sz\u00e1m\u00e1ra, m\u00edg a mikrok\u00f3ddal egy\u00fctt megosztott patch tartalmazza a nyilv\u00e1nos kulcsot. A processzor \u00f6sszehasonl\u00edtja az AMD mikrok\u00f3d gy\u00e1rt\u00e1sakor be\u00e9p\u00edtett nyilv\u00e1nos kulcs\u00e1nak hash-\u00e9t a patch-ben felt\u00fcntetett nyilv\u00e1nos kulcs hash-\u00e9l, hogy ellen\u0151rizze, hogy a nyilv\u00e1nos kulcs megfelel az eredeti RSA kulcsp\u00e1rnak.     <\/p>\n<p>A mikrok\u00f3d hiteles\u00edt\u00e9se a jav\u00edt\u00e1son azzal t\u00f6rt\u00e9nik, hogy \u00f6sszehasonl\u00edtj\u00e1k a jav\u00edt\u00e1ssal sz\u00e1ll\u00edtott, digit\u00e1lis al\u00e1\u00edr\u00e1ssal (RSASSA-PKCS1-v1_5) al\u00e1\u00edrt hash-t a jav\u00edt\u00e1shoz t\u00e9nylegesen sz\u00e1ll\u00edtott mikrok\u00f3d alapj\u00e1n sz\u00e1m\u00edtott hash-sel. Ha az alap\u00e9rtelmezett \u00e9s a sz\u00e1m\u00edtott hash egybeesik \u2014 a jav\u00edt\u00e1s bet\u00f6lt\u0151dik a CPU bels\u0151 mem\u00f3ri\u00e1j\u00e1ba. A probl\u00e9ma az, hogy a javasolt kriptogr\u00e1fiai hash-funkci\u00f3k helyett egy CMAC algoritmus ker\u00fclt alkalmaz\u00e1sra, amely nem alkalmas ilyen m\u0171veletekre, \u00e9s nem v\u00e9dett az \u00fctk\u00f6z\u00e9sek kiv\u00e1laszt\u00e1sa ellen.    <\/p>\n<p>A CMAC nem hash-funkci\u00f3, hanem egy kulcshoz k\u00f6t\u00f6tt \u00fczenet-hiteles\u00edt\u00e9si k\u00f3d (Message Authentication Code). Az AES-CMAC m\u0171k\u00f6d\u00e9se a titkos\u00edt\u00f3 algoritmus AES alkalmaz\u00e1s\u00e1ra \u00e9s a kimeneti adat kisz\u00e1m\u00edt\u00e1s\u00e1nak XOR funkci\u00f3val t\u00f6rt\u00e9n\u0151 \u00f6sszekapcsol\u00e1s\u00e1ra \u00e9p\u00fcl. Ez a s\u00e9ma garant\u00e1lja, hogy a bemeneti adatok megv\u00e1ltoz\u00e1sa kisz\u00e1m\u00edthatatlan kimeneti adatok megv\u00e1ltoz\u00e1s\u00e1t eredm\u00e9nyezi. Ezenk\u00edv\u00fcl a CMAC nem haszn\u00e1lhat\u00f3 hash-funkci\u00f3k\u00e9nt, mivel b\u00e1rki, aki ismeri az eredeti titkos\u00edt\u00f3 kulcsot, ismerheti a titkos\u00edt\u00e1si folyamat k\u00f6ztes \u00e1llapotait, \u00e9s olyan \u00e9rt\u00e9keket sz\u00e1m\u00edthat ki, amelyek kompenz\u00e1lj\u00e1k a bemeneti adatok v\u00e1ltoz\u00e1s\u00e1t, \u00edgy a CMAC alkalmaz\u00e1s\u00e1nak eredm\u00e9nye v\u00e1ltozatlan marad.     <\/p>\n<p>Az AMD az AES-CMAC sz\u00e1m\u00e1ra egyetlen titkos\u00edt\u00e1si kulcsot alkalmaz, amelyet minden Zen 1-t\u0151l kezd\u0151d\u0151 CPU-ra telep\u00edtenek. \u00cdgy elegend\u0151 csak egy AMD CPU-b\u00f3l kinyerni ezt a kulcsot, \u00e9s az alkalmazhat\u00f3 lesz az \u00f6sszes t\u00f6bbi CPU-ra. A kutat\u00f3k felfedezt\u00e9k, hogy az AMD AES-CMAC titkos\u00edt\u00e1shoz egy ismert kulcsot haszn\u00e1lt, amely a NIST SP 800-38B blokkl\u00e1nc titkos\u00edt\u00e1si aj\u00e1nl\u00e1s\u00e1ban eml\u00edtett p\u00e9ld\u00e1b\u00f3l sz\u00e1rmazik. Mivel az AES-CMAC-ot a RSA-kulcs be\u00e9p\u00edtett al\u00e1\u00edr\u00e1s\u00e1nak \u00e9s a mikrok\u00f3d tartalm\u00e1nak hash-el\u00e9s\u00e9re haszn\u00e1lj\u00e1k, a titkos\u00edt\u00f3 kulcs kider\u00edt\u00e9s\u00e9vel lehet\u0151s\u00e9g ny\u00edlt egy m\u00e1sik ny\u00edlt RSA-kulcs behelyettes\u00edt\u00e9s\u00e9re a patch-be, ez\u00e1ltal m\u00f3dos\u00edtva a mikrok\u00f3d tartalm\u00e1t.       <\/p>\n<p>Egy hamis patch l\u00e9trehoz\u00e1s\u00e1hoz elegend\u0151 egy \u00faj ny\u00edlt kulcs gener\u00e1l\u00e1sa, amely ugyanazt a hash-t hozza l\u00e9tre, mint az AMD eredeti ny\u00edlt kulcsa, valamint koll\u00edzi\u00f3k megtal\u00e1l\u00e1sa a digit\u00e1lis al\u00e1\u00edr\u00e1shoz. A koll\u00edzi\u00f3k \u00fagy j\u00f6nnek l\u00e9tre, hogy egy kieg\u00e9sz\u00edt\u0151 blokkot csatolnak a mikrok\u00f3dhoz, amelynek kin\u00e9zete v\u00e9letlenszer\u0171 adathalmazon alapul. \u00cdgy lehets\u00e9ges egy m\u00f3dos\u00edtott patch elk\u00e9sz\u00edt\u00e9se a mikrok\u00f3dhoz, amely megfelel annak a digit\u00e1lis al\u00e1\u00edr\u00e1snak, amellyel az AMD eredeti patch\u00e9t hiteles\u00edtett\u00e9k. A Zentool eszk\u00f6zk\u00e9szlet, amely mikrok\u00f3d elemz\u00e9s\u00e9re \u00e9s patch-ek k\u00e9sz\u00edt\u00e9s\u00e9re szolg\u00e1l\u00f3 seg\u00e9dprogramokat tartalmaz, az Apache 2.0 licenc alatt \u00e9rhet\u0151 el. A mikrok\u00f3d cser\u00e9j\u00e9hez sz\u00fcks\u00e9ges a k\u00f3d v\u00e9grehajt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges jogosults\u00e1g a nulladik v\u00e9delmi gy\u0171r\u0171 szintj\u00e9n (a VT-x \u00e9s AMD-V technol\u00f3gi\u00e1k lehet\u0151v\u00e9 teszik, hogy a vend\u00e9g rendszer Ring 0 jogokkal fusson).<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63055\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f AMD \u0432\u043a\u043b\u044e\u0447\u0438\u043b\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u044b \u043d\u0430 \u0431\u0430\u0437\u0435 \u043c\u0438\u043a\u0440\u043e\u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b Zen 5 \u0432 \u0441\u043f\u0438\u0441\u043e\u043a \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432, \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 EntrySign, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u0431\u043e\u0439\u0442\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u043f\u043e\u0434\u043f\u0438\u0441\u0438 \u043f\u0440\u0438 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0438 \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u0434\u0430. \u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043f\u0440\u0435\u0434\u043f\u043e\u043b\u0430\u0433\u0430\u043b\u043e\u0441\u044c, \u0447\u0442\u043e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e CPU AMD \u043d\u0430 \u0431\u0430\u0437\u0435 1-4 \u043f\u043e\u043a\u043e\u043b\u0435\u043d\u0438\u0439 \u043c\u0438\u043a\u0440\u043e\u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b Zen. \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043e\u043a\u0430\u0437\u0430\u043b\u0430\u0441\u044c \u043f\u0440\u0438\u043c\u0435\u043d\u0438\u043c\u0430 \u043a \u0442\u0430\u043a\u0438\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u043c, \u043a\u0430\u043a Ryzen 9000 (Granite Ridge), EPYC 9005 (Turin), Ryzen [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-123472","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f AMD \u0432\u043a\u043b\u044e\u0447\u0438\u043b\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u044b \u043d\u0430 \u0431\u0430\u0437\u0435 \u043c\u0438\u043a\u0440\u043e\u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b Zen 5 \u0432 \u0441\u043f\u0438\u0441\u043e\u043a \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432, \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043d\u044b\u0445 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