{"id":112508,"date":"2023-12-26T15:10:15","date_gmt":"2023-12-26T13:10:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/lokalnaya-uyazvimost-v-yadre-linux-ekspluatiruemaya-cherez-nftables"},"modified":"2023-12-26T15:10:15","modified_gmt":"2023-12-26T13:10:15","slug":"lokalnaya-uyazvimost-v-yadre-linux-ekspluatiruemaya-cherez-nftables","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/lokalnaya-uyazvimost-v-yadre-linux-ekspluatiruemaya-cherez-nftables","title":{"rendered":"Lokalna podatno\u015b\u0107 w j\u0105drze Linux, eksploatowana przez nftables","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W podsystemie Netfilter zidentyfikowano luk\u0119 (CVE-2023-6817), kt\u00f3ra potencjalnie pozwala lokalnemu u\u017cytkownikowi na podniesienie swoich uprawnie\u0144 w systemie. Problem wynika z odwo\u0142ania do pami\u0119ci po jej zwolnieniu (use-after-free) w module nf_tables, kt\u00f3ry odpowiada za dzia\u0142anie filtra pakiet\u00f3w nftables. Luka wyst\u0119puje od wersji j\u0105dra Linux 5.6. Poprawka luki zosta\u0142a zaproponowana w testowej wersji j\u0105dra Linux 6.7-rc5 i przeniesiona do aktualnych stabilnych ga\u0142\u0119zi 5.10.204, 5.15.143, 6.1.68 i 6.6.7. <\/p>\n

Problem jest spowodowany b\u0142\u0119dem w funkcji nft_pipapo_walk, przez co podczas iteracji element\u00f3w PIPAPO (Pile Packet Policies) nie sprawdzano obecno\u015bci duplikat\u00f3w, co prowadzi\u0142o do podw\u00f3jnego zwolnienia pami\u0119ci. Do przeprowadzenia ataku wymagany jest dost\u0119p do nftables, kt\u00f3ry mo\u017cna uzyska\u0107, maj\u0105c uprawnienia CAP_NET_ADMIN w dowolnej przestrzeni nazw identyfikator\u00f3w u\u017cytkownik\u00f3w (user namespace) lub w przestrzeni nazw sieci (network namespace), kt\u00f3re mog\u0105 by\u0107 udost\u0119pniane, na przyk\u0142ad, w izolowanych kontenerach. W celu przetestowania swoich system\u00f3w opublikowano prototyp exploita.
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 Netfilter \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-6817), \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435\u043c \u043a \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u043e\u0441\u043b\u0435 \u0435\u0451 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0438\u044f (use-after-free) \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 nf_tables, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u043c \u0440\u0430\u0431\u043e\u0442\u0443 \u043f\u0430\u043a\u0435\u0442\u043d\u043e\u0433\u043e \u0444\u0438\u043b\u044c\u0442\u0440\u0430 nftables. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 Linux 5.6. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043e \u0432 \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u044f\u0434\u0440\u0430 Linux 6.7-rc5 \u0438 \u043f\u0435\u0440\u0435\u043d\u0435\u0441\u0435\u043d\u043e \u0432 \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0435 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0435 \u0432\u0435\u0442\u043a\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-112508","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\udd47Lokalna luka w j\u0105drze Linux, eksploatowana przez nftables | ProHoster","description":"W podsystemie Netfilter zidentyfikowano luk\u0119 (CVE-2023-6817), kt\u00f3ra potencjalnie pozwala lokalnemu u\u017cytkownikowi na podniesienie swoich uprawnie\u0144 w 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\u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 Netfilter \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-6817), \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435.","og:url":"https:\/\/prohoster.info\/pl\/blog\/news\/lokalnaya-uyazvimost-v-yadre-linux-ekspluatiruemaya-cherez-nftables","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-12-26T13:10:15+00:00","article:modified_time":"2023-12-26T13:10:15+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts\/112508","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/comments?post=112508"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts\/112508\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/media?parent=112508"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/categories?post=112508"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/tags?post=112508"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}