V modulu ksmbd, kter\u00fd zahrnuje vestav\u011bnou implementaci souborov\u00e9ho serveru na b\u00e1zi protokolu SMB v j\u00e1d\u0159e Linuxu, byla zji\u0161t\u011bna kritick\u00e1 zranitelnost, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 proveden\u00ed vlastn\u00edho k\u00f3du s pr\u00e1vy j\u00e1dra. \u00datok m\u016f\u017ee b\u00fdt proveden bez autentizace, sta\u010d\u00ed, aby byl na syst\u00e9mu aktivov\u00e1n modul ksmbd. Probl\u00e9m se projevuje od j\u00e1dra 5.15, vydan\u00e9ho v listopadu 2021, a byl bez zbyte\u010dn\u00e9 publicity opraven v aktualizac\u00edch 5.15.61, 5.18.18 a 5.19.2, kter\u00e9 byly vytvo\u0159eny v srpnu 2022. Jeliko\u017e CVE identifik\u00e1tor probl\u00e9mu zat\u00edm nebyl p\u0159i\u0159azen, p\u0159esn\u00e9 informace o jeho odstran\u011bn\u00ed v distribuc\u00edch zat\u00edm neexistuj\u00ed. <\/p>\n
Detaily o zneu\u017eit\u00ed zranitelnosti zat\u00edm nebyly zve\u0159ejn\u011bny, v\u00edme v\u0161ak, \u017ee zranitelnost je zp\u016fsobena dotazem na ji\u017e uvoln\u011bnou oblast pam\u011bti (Use-After-Free) kv\u016fli absenci kontroly existence objektu p\u0159ed proveden\u00edm operac\u00ed s n\u00edm. Probl\u00e9m souvis\u00ed s t\u00edm, \u017ee v funkci smb2_tree_disconnect() byla uvoln\u011bna pam\u011b\u0165 vyhrazen\u00e1 pro strukturu ksmbd_tree_connect, ale pot\u00e9 je\u0161t\u011b z\u016fstal ukazatel pou\u017e\u00edvan\u00fd p\u0159i zpracov\u00e1v\u00e1n\u00ed ur\u010dit\u00fdch extern\u00edch po\u017eadavk\u016f obsahuj\u00edc\u00edch p\u0159\u00edkazy SMB2_TREE_DISCONNECT. <\/p>\n
Krom\u011b zm\u00edn\u011bn\u00e9 zranitelnosti byly v ksmbd opraveny tak\u00e9 4 m\u00e9n\u011b z\u00e1va\u017en\u00e9 probl\u00e9my: <\/p>\n
Podpora provozu SMB serveru pomoc\u00ed modulu ksmbd je obsa\u017eena v bal\u00ed\u010dku Samba od verze 4.16.0. Na rozd\u00edl od SMB serveru funguj\u00edc\u00edho v prostorov\u011b u\u017eivatelsk\u00e9m re\u017eimu, je ksmbd v\u00fdkonn\u011bj\u0161\u00ed z hlediska v\u00fdkonu, spot\u0159eby pam\u011bti a integrace s pokro\u010dil\u00fdmi funkcemi j\u00e1dra. Ksmbd je p\u0159edstaven jako vysoce v\u00fdkonn\u00e9 a p\u0159ipraven\u00e9 k pou\u017eit\u00ed roz\u0161\u00ed\u0159en\u00ed pro Samba na vestav\u011bn\u00fdch za\u0159\u00edzen\u00edch, s mo\u017enost\u00ed integrace s n\u00e1stroji a knihovnami Samba. Autory k\u00f3du ksmbd jsou Namjae Jeon z firmy Samsung a Hyunchul Lee z LG, zat\u00edmco \u00fadr\u017ebu j\u00e1dra zaji\u0161\u0165uje Steve French z firmy Microsoft, udr\u017eovatel subsyst\u00e9mu CIFS\/SMB2\/SMB3 v j\u00e1d\u0159e Linux a dlouholet\u00fd \u010dlen v\u00fdvojov\u00e9ho t\u00fdmu Samba, kter\u00fd v\u00fdznamn\u011b p\u0159isp\u011bl k implementaci podpory protokol\u016f SMB\/CIFS v Samba a Linuxu. \u0412 \u043c\u043e\u0434\u0443\u043b\u0435 ksmbd, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u043c \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u0443\u044e \u0432 \u044f\u0434\u0440\u043e Linux \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SMB, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \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. \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0430 \u0431\u0435\u0437 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0447\u0442\u043e\u0431\u044b \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0431\u044b\u043b \u0430\u043a\u0442\u0438\u0432\u0438\u0440\u043e\u0432\u0430\u043d \u043c\u043e\u0434\u0443\u043b\u044c ksmbd. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 5.15, \u0432\u044b\u043f\u0443\u0449\u0435\u043d\u043d\u043e\u0433\u043e \u0432 \u043d\u043e\u044f\u0431\u0440\u0435 2021 \u0433\u043e\u0434\u0430, \u0438 \u0431\u0435\u0437 \u043b\u0438\u0448\u043d\u0435\u0439 […]<\/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-106241","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\udd47Zranitelnost v modulu ksmbd j\u00e1dra Linux, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 proveden\u00ed vlastn\u00edho k\u00f3du | ProHoster","description":"V modulu ksmbd, kter\u00fd zahrnuje vestav\u011bnou implementaci souborov\u00e9ho serveru na z\u00e1klad\u011b protokolu SMB v j\u00e1d\u0159e Linux, byla objevena kritick\u00e1 zranitelnost, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 proveden\u00ed 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\u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 | ProHoster","og:description":"\u0412 \u043c\u043e\u0434\u0443\u043b\u0435 ksmbd, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u043c \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u0443\u044e \u0432 \u044f\u0434\u0440\u043e Linux \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SMB, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f 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\u044f\u0434\u0440\u0430.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-module-ksmbd-yadra-linux-pozvolyayushhaya-udalyonno-vypolnit-svoj-kod","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":"2022-12-23T07:36:47+00:00","article:modified_time":"2022-12-23T07:36:47+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\/cs\/wp-json\/wp\/v2\/posts\/106241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=106241"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/106241\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=106241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=106241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=106241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"