{"id":119301,"date":"2024-08-10T09:43:01","date_gmt":"2024-08-10T07:43:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/sinkclose-uyazvimost-v-cpu-amd-pozvolyayushhaya-poluchit-dostup-k-smm"},"modified":"2024-08-10T09:43:01","modified_gmt":"2024-08-10T07:43:01","slug":"sinkclose-uyazvimost-v-cpu-amd-pozvolyayushhaya-poluchit-dostup-k-smm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/sinkclose-uyazvimost-v-cpu-amd-pozvolyayushhaya-poluchit-dostup-k-smm","title":{"rendered":"Sinkclose \u2014 zranitelnost v CPU AMD, kter\u00e1 umo\u017e\u0148uje p\u0159\u00edstup k SMM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdzkumn\u00edci ze spole\u010dnosti IOActive odhalili zranitelnost (CVE-2023-31315) v procesorech AMD, kter\u00e1 p\u0159i privilegiovan\u00e9m lok\u00e1ln\u00edm p\u0159\u00edstupu k syst\u00e9mu umo\u017e\u0148uje zm\u011bnit konfiguraci SMM (System Management Mode, Ring -2), i kdy\u017e je aktivn\u00ed mechanismus blokace SMM (SMM Lock), a potenci\u00e1ln\u011b tak\u00e9 poskytne mo\u017enost vykonat k\u00f3d na \u00farovni SMM. \u00darove\u0148 SMM, kter\u00e1 m\u00e1 vy\u0161\u0161\u00ed prioritu ne\u017e hypervizor a nulov\u00e9 ochrann\u00e9 kolo, umo\u017e\u0148uje neomezen\u00fd p\u0159\u00edstup k cel\u00e9 syst\u00e9mov\u00e9 pam\u011bti a m\u016f\u017ee b\u00fdt vyu\u017eita pro kontrolu opera\u010dn\u00edho syst\u00e9mu. <\/p>\n

Zranitelnost, kter\u00e1 byla pojmenov\u00e1na Sinkclose, je zp\u016fsobena nespr\u00e1vnou kontrolou registr\u016f specifick\u00fdch pro model (MSR, Model Specific Register). SMM p\u0159i\u0159azuje oblast fyzick\u00fdch str\u00e1nek pam\u011bti, k n\u00ed\u017e je blokov\u00e1n p\u0159\u00edstup na \u00farovni pam\u011b\u0165ov\u00e9ho \u0159adi\u010de. Odhalen\u00e1 zranitelnost umo\u017e\u0148uje obej\u00edt tuto blokaci manipulac\u00ed s ur\u010dit\u00fdmi registry MSR, do kter\u00fdch nebylo zak\u00e1z\u00e1no zapisovat, i p\u0159es nastaven\u00ed re\u017eimu SMM Lock. <\/p>\n

Exploatace zranitelnosti m\u016f\u017ee b\u00fdt provedena z nulov\u00e9ho ochrann\u00e9ho kola, na kter\u00e9m b\u011b\u017e\u00ed j\u00e1dro opera\u010dn\u00edho syst\u00e9mu, a m\u016f\u017ee b\u00fdt vyu\u017eita nap\u0159\u00edklad k udr\u017een\u00ed p\u0159\u00edtomnosti po exploataci jin\u00fdch zranitelnost\u00ed v syst\u00e9mu nebo aplikaci metod soci\u00e1ln\u00edho in\u017een\u00fdrstv\u00ed. Opera\u010dn\u00ed syst\u00e9m nen\u00ed schopen sledovat a kontrolovat vykon\u00e1v\u00e1n\u00ed k\u00f3du na \u00farovni SMM, co\u017e m\u016f\u017ee b\u00fdt pou\u017eito k modifikaci firmwaru a um\u00edst\u011bn\u00ed skryt\u00e9ho \u0161kodliv\u00e9ho k\u00f3du nebo rootkit\u016f, kter\u00e9 nejsou detekov\u00e1ny opera\u010dn\u00edm syst\u00e9mem, a tak\u00e9 k deaktivaci ov\u011b\u0159ov\u00e1n\u00ed b\u011bhem bootov\u00e1n\u00ed a \u00fatok\u016fm na hypervizory za \u00fa\u010delem obch\u00e1zen\u00ed mechanism\u016f kontroly integrity virtu\u00e1ln\u00edch prost\u0159ed\u00ed. <\/p>\n

Zranitelnost se projevuje prakticky ve v\u0161ech \u010dipech AMD vyroben\u00fdch od roku 2006, v\u010detn\u011b \u0159ady procesor\u016f AMD EPYC (1-4 generace), Ryzen (R1000, R2000, 3000-8000, V1000, V2000, V3000), Athlon 3000 a Threadripper PRO. Aktualizace mikrok\u00f3du pro blokaci zranitelnosti ji\u017e byly vyd\u00e1ny pro mobiln\u00ed a desktopov\u00e9 \u0159ady CPU EPYC a Ryzen. Pro vestav\u011bn\u00e9 modely CPU se aktualizace pl\u00e1nuj\u00ed zve\u0159ejnit v \u0159\u00edjnu. Jedin\u00fdm zp\u016fsobem, jak odstranit \u0161kodliv\u00fd k\u00f3d zaveden\u00fd prost\u0159ednictv\u00edm \u00fatoku na SMM, je vymaz\u00e1n\u00ed pam\u011bti pomoc\u00ed fyzicky p\u0159ipojen\u00e9ho program\u00e1toru SPI Flash.
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 IOActive \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-31315) \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 AMD, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044e SMM (System Management Mode, Ring -2), \u0434\u0430\u0436\u0435 \u0435\u0441\u043b\u0438 \u0432\u043a\u043b\u044e\u0447\u0451\u043d \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0438 SMM (SMM Lock), \u0430 \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 SMM. \u0423\u0440\u043e\u0432\u0435\u043d\u044c SMM, \u0438\u043c\u0435\u044e\u0449\u0438\u0439 \u0431\u043e\u043b\u0435\u0435 \u0432\u044b\u0441\u043e\u043a\u0438\u0439 \u043f\u0440\u0438\u043e\u0440\u0438\u0442\u0435\u0442, \u0447\u0435\u043c \u0440\u0435\u0436\u0438\u043c \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 \u0438 […]<\/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-119301","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Sinkclose \u2014 zranitelnost v CPU AMD, kter\u00e1 umo\u017e\u0148uje p\u0159\u00edstup k SMM | ProHoster","description":"V\u00fdzkumn\u00edci ze spole\u010dnosti IOActive odhalili zranitelnost (CVE-2023-31315) v procesorech AMD, kter\u00e1 p\u0159i privilegovan\u00e9m m\u00edstn\u00edm p\u0159\u00edstupu k syst\u00e9mu umo\u017e\u0148uje zm\u011bnit konfiguraci SMM (System Management Mode, 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