{"id":114955,"date":"2024-04-09T21:31:00","date_gmt":"2024-04-09T19:31:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/novyj-variant-ataki-bhi-na-cpu-intel-pozvolyayushhij-obojti-zashhitu-v-yadre-linux"},"modified":"2024-04-09T21:31:00","modified_gmt":"2024-04-09T19:31:00","slug":"novyj-variant-ataki-bhi-na-cpu-intel-pozvolyayushhij-obojti-zashhitu-v-yadre-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/novyj-variant-ataki-bhi-na-cpu-intel-pozvolyayushhij-obojti-zashhitu-v-yadre-linux","title":{"rendered":"Nowa wersja ataku BHI na CPU Intel, umo\u017cliwiaj\u0105ca obej\u015bcie zabezpiecze\u0144 w j\u0105drze Linux.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Grupa badawcza z Uniwersytetu Wolnego w Amsterdamie zidentyfikowa\u0142a now\u0105 metod\u0119 ataku \u201eNative BHI\u201d (CVE-2024-2201), kt\u00f3ra pozwala na okre\u015blenie zawarto\u015bci pami\u0119ci j\u0105dra Linux na systemach z procesorami Intel podczas wykonywania exploita w przestrzeni u\u017cytkownika. W przypadku zastosowania ataku na systemy wirtualizacji, atakuj\u0105cy z systemu go\u015bcia mo\u017ce okre\u015bli\u0107 zawarto\u015b\u0107 pami\u0119ci \u015brodowiska gospodarza lub innych system\u00f3w go\u015bci.     <\/p>\n<p>Metoda Native BHI oferuje inn\u0105 technik\u0119 eksploatacji luki BHI (Branch History Injection, CVE-2022-0001), kt\u00f3ra omija wcze\u015bniej wdro\u017cone \u015brodki ochrony. Proponowana w 2022 roku metoda ataku BHI zak\u0142ada\u0142a eksploatacj\u0119 luki w ramach jednego poziomu uprawnie\u0144, w tym celu exploit opiera\u0142 si\u0119 na wykonaniu programu eBPF, za\u0142adowanego przez u\u017cytkownika w j\u0105drze. Aby zablokowa\u0107 luk\u0119, wystarczy\u0142o ograniczy\u0107 dost\u0119p do wykonywania kodu eBPF dla zwyk\u0142ych u\u017cytkownik\u00f3w.     <\/p>\n<p>Nowa metoda Native BHI nie wymaga dost\u0119pu do eBPF i pozwala na przeprowadzenie ataku przez u\u017cytkownika nieprzywilejowanego z przestrzeni u\u017cytkownika. Metoda opiera si\u0119 na wykonywaniu istniej\u0105cych w kodzie j\u0105dra gad\u017cet\u00f3w \u2014 sekwencji instrukcji prowadz\u0105cych do spekulatywnego wykonania instrukcji. Aby znale\u017a\u0107 odpowiednie gad\u017cety w j\u0105drze, opracowano specjalne narz\u0119dzie InSpectre Gadget, kt\u00f3re podczas analizy j\u0105dra 6.6-rc4 zidentyfikowa\u0142o 1511 gad\u017cet\u00f3w Spectre oraz 2105 pomocniczych gad\u017cet\u00f3w do zarz\u0105dzania.      <center><img decoding=\"async\" alt=\"Nowa wersja ataku BHI na CPU Intel, umo\u017cliwiaj\u0105ca obej\u015bcie zabezpiecze\u0144 w j\u0105drze Linux.\" src=\"\/wp-content\/uploads\/2024\/04\/93734194d4b9a6cfe5a62d7d73915d83.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Na podstawie znalezionych gad\u017cet\u00f3w badacze przygotowali exploit, kt\u00f3ry umo\u017cliwia wydobycie z bufor\u00f3w j\u0105dra ci\u0105gu z has\u0142em u\u017cytkownika root, za\u0142adowanym z pliku \/etc\/shadow. Pr\u0119dko\u015b\u0107 wydobywania danych z pami\u0119ci j\u0105dra wynosi oko\u0142o 3,5 KB na sekund\u0119.      <center>  <div class=\"youtube-placeholder\" data-id=\"24HcE1rDMdo\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/24HcE1rDMdo\/hqdefault.jpg\" alt=\"Odtwarzaj wideo\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center>      <\/p>\n<p>Metoda BHI jest rozszerzon\u0105 wersj\u0105 ataku Spectre-v2, w kt\u00f3rej w celu omini\u0119cia dodatkowej ochrony (Intel eIBRS i Arm CSV2) oraz zorganizowania wycieku danych wykorzystuje podstawianie warto\u015bci w buforze z globaln\u0105 histori\u0105 przej\u015b\u0107 (Branch History Buffer), stosowanym w CPU w celu zwi\u0119kszenia dok\u0142adno\u015bci przewidywania przej\u015b\u0107 dzi\u0119ki uwzgl\u0119dnieniu historii poprzednich przej\u015b\u0107. W trakcie ataku poprzez manipulacje z histori\u0105 przej\u015b\u0107 tworzone s\u0105 warunki do b\u0142\u0119dnego przewidywania przej\u015bcia i spekulatywnego wykonywania niezb\u0119dnych instrukcji, kt\u00f3rych wyniki osiedlaj\u0105 si\u0119 w cache.    <\/p>\n<p>R\u00f3\u017cnice w ataku Spectre-v2 dotycz\u0105 u\u017cycia bufora historii przej\u015b\u0107 (Branch History Buffer) zamiast bufora przewidywania ga\u0142\u0119zi (Branch Target Buffer). Aby wydoby\u0107 dane z pami\u0119ci, atakuj\u0105cy musi stworzy\u0107 warunki, w kt\u00f3rych podczas wykonywania operacji spekulacyjnej adres zostanie pobrany z obszaru, kt\u00f3ry nale\u017cy okre\u015bli\u0107. Po wykonaniu spekulacyjnego po\u015bredniego przej\u015bcia, odczytany z pami\u0119ci adres przej\u015bcia pozostaje w cache, po czym jeden ze sposob\u00f3w okre\u015blenia zawarto\u015bci cache mo\u017ce by\u0107 zastosowany na podstawie analizy zmiany czasu dost\u0119pu do danych w cache i nie w cache.     <\/p>\n<p>Atak Native BHI nie jest chroniony przez zastosowanie instrukcji Intel IBT (Indirect Branch Tracking) oraz hybrydowego mechanizmu ochrony przep\u0142ywu wykonania FineIBT, wdro\u017conego w j\u0105drze Linux, kt\u00f3ry \u0142\u0105czy zastosowanie sprz\u0119towych instrukcji IBT i programowej ochrony kCFI (kernel Control Flow Integrity) w celu zablokowania naruszenia normalnej kolejno\u015bci wykonania (control flow). FineIBT zezwala na wykonanie po po\u015brednim przej\u015bciu tylko w przypadku przej\u015bcia do instrukcji ENDBR, kt\u00f3ra umieszczana jest na samym pocz\u0105tku funkcji. Dodatkowo (analogicznie do mechanizmu kCFI) nast\u0119puje weryfikacja haszy, gwarantuj\u0105cych niezmienno\u015b\u0107 wska\u017anik\u00f3w.     <\/p>\n<p>Aby chroni\u0107 przed nowym wariantem ataku, w j\u0105drze Linux dodano zmian\u0119 z implementacj\u0105 dodatkowego trybu ochrony, stosuj\u0105cego proponowane przez firm\u0119 Intel sprz\u0119towe \u015brodki ochrony (BHI_DIS_S) lub alternatywn\u0105 programow\u0105 ochron\u0119, wdro\u017con\u0105 w celu ochrony hipernadzorcy. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/vps\/abuzoustojchivye-vps\/\"   title=\"KVM\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4389\">KVM<\/a>. Tw\u00f3rcy hipernadzorcy Xen r\u00f3wnie\u017c wydali poprawk\u0119, opart\u0105 na u\u017cyciu trybu BHI_DIS_S, ograniczaj\u0105cego przewidywania na podstawie historii przej\u015b\u0107. Wsparcie dla BHI_DIS_S jest dost\u0119pne w procesorach pocz\u0105wszy od Intel Alder Lake, jak r\u00f3wnie\u017c w serwerowych CPU, pocz\u0105wszy od Intel Sapphire Rapids. Dost\u0119pny jest r\u00f3wnie\u017c programowy tryb ochrony, oparty na u\u017cyciu sekwencji do czyszczenia bufora historii przej\u015b\u0107, jednak prowadzi to do bardziej zauwa\u017calnego spadku wydajno\u015bci.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60963\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0410\u043c\u0441\u0442\u0435\u0440\u0434\u0430\u043c\u0441\u043a\u043e\u0433\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 &#171;Native BHI&#187; (CVE-2024-2201), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u043c\u0438 Intel \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 Linux \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 \u0432 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f. \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438, \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u0438\u0437 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043c\u043e\u0436\u0435\u0442 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0438\u043b\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u0433\u043e\u0441\u0442\u0435\u0432\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c. \u041c\u0435\u0442\u043e\u0434 Native BHI \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u0435\u0442 \u0438\u043d\u0443\u044e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":114956,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-114955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0410\u043c\u0441\u0442\u0435\u0440\u0434\u0430\u043c\u0441\u043a\u043e\u0433\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 &quot;Native BHI&quot; (CVE-2024-2201), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u043c\u0438 Intel \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 Linux \u043f\u0440\u0438.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/pl\/blog\/news\/novyj-variant-ataki-bhi-na-cpu-intel-pozvolyayushhij-obojti-zashhitu-v-yadre-linux\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"pl_PL\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u041d\u043e\u0432\u044b\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u0430\u0442\u0430\u043a\u0438 BHI \u043d\u0430 CPU Intel, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043e\u0431\u043e\u0439\u0442\u0438 \u0437\u0430\u0449\u0438\u0442\u0443 \u0432 \u044f\u0434\u0440\u0435 Linux | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0410\u043c\u0441\u0442\u0435\u0440\u0434\u0430\u043c\u0441\u043a\u043e\u0433\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 &quot;Native BHI&quot; 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