I modul ksmbd, som inkluderer en indbygget Linux-kernel-implementering af en filserver baseret p\u00e5 SMB-protokollen, er der opdaget en kritisk s\u00e5rbarhed, der g\u00f8r det muligt for angribere at udf\u00f8re egen kode med kernel-rettigheder p\u00e5 afstand. Angrebet kan udf\u00f8res uden autentifikation, s\u00e5 l\u00e6nge modulet ksmbd er aktiveret p\u00e5 systemet. Problemet har vist sig siden kernel 5.15, der blev udsendt i november 2021, og er uden yderligere omtale blevet rettet i opdateringerne 5.15.61, 5.18.18 og 5.19.2, der blev udgivet i august 2022. Da der endnu ikke er tildelt et CVE-id til problemet, er der ingen pr\u00e6cise oplysninger om l\u00f8sningen i distributionerne endnu. <\/p>\n
Detaljer om udnyttelse af s\u00e5rbarheden offentligg\u00f8res endnu ikke; det vides kun, at s\u00e5rbarheden skyldes adgang til allerede frigivet hukommelse (Use-After-Free) p\u00e5 grund af manglende kontrol af objektets eksistens, inden der udf\u00f8res operationer med det. Problemet relaterer sig til, at hukommelsen, der var allokeret til strukturen ksmbd_tree_connect, blev frigivet i funktionen smb2_tree_disconnect(), men at der stadig var en pointer tilbage, som blev brugt ved behandling af bestemte eksterne foresp\u00f8rgsler, der indeholdt kommandoer SMB2_TREE_DISCONNECT. <\/p>\n
Udover den n\u00e6vnte s\u00e5rbarhed i ksmbd er der ogs\u00e5 rettet fire mindre alvorlige problemer: <\/p>\n
Underst\u00f8ttelsen af SMB-serverdrift ved hj\u00e6lp af ksmbd-modulet er tilg\u00e6ngelig i Samba-pakken fra version 4.16.0. I mods\u00e6tning til en SMB-server, der k\u00f8rer i brugerrum, er ksmbd mere effektiv med hensyn til ydeevne, hukommelsesforbrug og integration med avancerede kernefunktioner. Ksmbd pr\u00e6senteres som et h\u00f8jtydende og anvendelsesklar udvidelse af Samba til indlejrede enheder, som ved behov kan integreres med v\u00e6rkt\u00f8jer og biblioteker fra Samba. Oprindelsen af ksmbd-koden tilh\u00f8rer Namjae Jeon fra Samsung og Hyunchul Lee fra LG, mens vedligeholdelsen i kerneversionen varetages af Steve French fra Microsoft, der er vedligeholder af CIFS\/SMB2\/SMB3 subsystemet i Linux-kernen og en langvarig deltager i Samba-udviklerteamet, som har ydet betydelig indsats for implementeringen af SMB\/CIFS-protokolunderst\u00f8ttelse i Samba og Linux. \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\udd47S\u00e5rbarhed i ksmbd-modulet i Linux-kernen, der muligg\u00f8r 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\u044f\u0434\u0440\u0430.","og:url":"https:\/\/prohoster.info\/da\/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\/da\/wp-json\/wp\/v2\/posts\/106241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/comments?post=106241"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/106241\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media?parent=106241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/categories?post=106241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/tags?post=106241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"