{"id":109268,"date":"2023-07-06T03:10:18","date_gmt":"2023-07-06T01:10:18","guid":{"rendered":"https:\/\/prohoster.info\/?p=109268"},"modified":"2023-07-06T09:41:48","modified_gmt":"2023-07-06T07:41:48","slug":"uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Luka StackRot w j\u0105drze Linux, umo\u017cliwiaj\u0105ca podniesienie swoich uprawnie\u0144","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W wyniku wprowadzenia w j\u0105drze Linux 6.1 przet\u0142umaczenia VMA (Virtual Memory Area) z struktury danych \u201edrzewo czerwono-czarne\u201d na \u201edrzewo klonowe\u201d pojawi\u0142a si\u0119 podatno\u015b\u0107 (CVE-2023-3269), umo\u017cliwiaj\u0105ca nieuprzywilejowanemu u\u017cytkownikowi wykonanie swojego kodu z prawami j\u0105dra. Podatno\u015b\u0107, znana pod nazw\u0105 kodow\u0105 StackRot, wyst\u0119puje od wydania j\u0105dra 6.1 i zosta\u0142a usuni\u0119ta w aktualizacjach 6.4.1, 6.3.11 oraz 6.1.37. <\/p>\n

Struktura \u201edrzewa klonowego\u201d to wariant B-drzewa, wspieraj\u0105cy indeksowanie w oparciu o zakresy warto\u015bci i zaprojektowany do efektywnego wykorzystania pami\u0119ci podr\u0119cznej nowoczesnych procesor\u00f3w. W por\u00f3wnaniu z \u201edrzewem czerwono-czarnym\u201d zastosowanie \u201edrzewa klonowego\u201d pozwala osi\u0105gn\u0105\u0107 wy\u017csz\u0105 wydajno\u015b\u0107. Podatno\u015b\u0107 jest spowodowana b\u0142\u0119dem w obs\u0142udze rozszerzenia stosu \u2014 w strukturze \u201edrzewa klonowego\u201d u\u017cywanej do zarz\u0105dzania obszarami pami\u0119ci wirtualnej w j\u0105drze, wymiana w\u0119z\u0142a w drzewie mog\u0142a nast\u0105pi\u0107 bez ustawienia blokady do zapisu, co stwarza\u0142o warunki do odwo\u0142ania si\u0119 do obszaru pami\u0119ci po jego zwolnieniu (use-after-free). <\/p>\n

Eksploatacja podatno\u015bci by\u0142a utrudniona tym, \u017ce w\u0119z\u0142y w strukturze \u201edrzewa klonowego\u201d s\u0105 zwalniane w trybie op\u00f3\u017anionym z u\u017cyciem wywo\u0142a\u0144 callback z blokadami RCU (Read-copy-update). Niemniej jednak badaczom uda\u0142o si\u0119 pokona\u0107 napotkane trudno\u015bci i przygotowa\u0107 dzia\u0142aj\u0105cy exploit, kt\u00f3ry planuj\u0105 opublikowa\u0107 pod koniec lipca, aby da\u0107 u\u017cytkownikom czas na aktualizacj\u0119 system\u00f3w. Eksploatacja jest mo\u017cliwa w prawie wszystkich konfiguracjach j\u0105dra i wymaga jedynie minimalnych uprawnie\u0144.
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux 6.1 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 VMA (Virtual Memory Area) \u0441\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 «red-black tree» \u043d\u0430 «maple tree» \u043f\u0440\u0438\u0432\u0451\u043b \u043a \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-3269), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u044f\u0434\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f StackRot, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u044f\u0434\u0440\u0430 6.1 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 6.4.1, 6.3.11 \u0438 6.1.37. \u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 «maple […]<\/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-109268","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\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\udd47Luka StackRot w j\u0105drze Linux, pozwalaj\u0105ca na podniesienie swoich uprawnie\u0144 | ProHoster","description":"Prze\u0142o\u017cenie VMA (Virtual Memory Area) w j\u0105drze Linux 6.1 z struktury danych \"red-black tree\" na \"maple tree\" doprowadzi\u0142o do pojawienia si\u0119 luki (CVE-2023-3269), pozwalaj\u0105cej nieuprzywilejowanemu u\u017cytkownikowi.","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pl_PL","og:site_name":"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","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c StackRot \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 | ProHoster","og:description":"\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux 6.1 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 VMA (Virtual Memory Area) \u0441\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 "red-black tree" \u043d\u0430 "maple tree" \u043f\u0440\u0438\u0432\u0451\u043b \u043a \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-3269), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 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