A ksmbd modulban, amely egy SMB protokollon alapul\u00f3 f\u00e1jlszerver be\u00e9p\u00edtett Linux kernel megval\u00f3s\u00edt\u00e1s\u00e1t tartalmazza, kritikus sebezhet\u0151s\u00e9get fedeztek fel, amely lehet\u0151v\u00e9 teszi a t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st kernel szint\u0171 jogosults\u00e1gokkal. A t\u00e1mad\u00e1s v\u00e9grehajthat\u00f3 hiteles\u00edt\u00e9s n\u00e9lk\u00fcl, amennyiben a ksmbd modul aktiv\u00e1lva van a rendszeren. A probl\u00e9ma a 2021 november\u00e9ben kiadott 5.15-\u00f6s kernelt\u0151l kezd\u0151d\u0151en jelentkezik, \u00e9s a 2022 augusztus\u00e1ban kiadott 5.15.61, 5.18.18 \u00e9s 5.19.2 verzi\u00f3kban, amelyek a probl\u00e9m\u00e1t csendben orvosolt\u00e1k. Mivel a CVE azonos\u00edt\u00f3ja m\u00e9g nem lett hozz\u00e1rendelve, a disztrib\u00faci\u00f3kban a probl\u00e9ma orvosl\u00e1s\u00e1r\u00f3l pontos inform\u00e1ci\u00f3 m\u00e9g nem \u00e1ll rendelkez\u00e9sre. <\/p>\n
A sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1nak r\u00e9szleteit egyel\u0151re nem hozz\u00e1k nyilv\u00e1noss\u00e1gra, csak annyit tudunk, hogy a sebezhet\u0151s\u00e9get a m\u00e1r felszabad\u00edtott mem\u00f3ria ter\u00fclethez (Use-After-Free) t\u00f6rt\u00e9n\u0151 hozz\u00e1f\u00e9r\u00e9s okozza, mivel nem v\u00e9geztek ellen\u0151rz\u00e9st az objektum l\u00e9tez\u00e9s\u00e9vel kapcsolatban a m\u0171veletek v\u00e9grehajt\u00e1sa el\u0151tt. A probl\u00e9ma \u00f6sszef\u00fcgg azzal, hogy a smb2_tree_disconnect() f\u00fcggv\u00e9nyben felszabad\u00edtott\u00e1k a ksmbd_tree_connect strukt\u00fara sz\u00e1m\u00e1ra foglalt mem\u00f3ri\u00e1t, de ezt k\u00f6vet\u0151en m\u00e9g maradt egy mutat\u00f3, amelyet bizonyos k\u00fcls\u0151 SMB2_TREE_DISCONNECT parancsokat fogad\u00f3 k\u00e9r\u00e9sek feldolgoz\u00e1sakor haszn\u00e1ltak. <\/p>\n
A fent eml\u00edtett sebezhet\u0151s\u00e9gen k\u00edv\u00fcl a ksmbd-ben n\u00e9gy kev\u00e9sb\u00e9 vesz\u00e9lyes probl\u00e9m\u00e1t is jav\u00edtottak: <\/p>\n
Az SMB-szerver m\u0171k\u00f6d\u00e9s\u00e9nek t\u00e1mogat\u00e1sa a ksmbd modul seg\u00edts\u00e9g\u00e9vel a Samba csomagban tal\u00e1lhat\u00f3, kezdve a 4.16.0 verzi\u00f3val. A felhaszn\u00e1l\u00f3i t\u00e9rben m\u0171k\u00f6d\u0151 SMB-szerverrel ellent\u00e9tben a ksmbd teljes\u00edtm\u00e9nye, mem\u00f3riafogyaszt\u00e1sa \u00e9s a kernel kiterjesztett lehet\u0151s\u00e9geivel val\u00f3 integr\u00e1ci\u00f3 szempontj\u00e1b\u00f3l hat\u00e9konyabb. A ksmbd egy nagy teljes\u00edtm\u00e9ny\u0171, be\u00e1gyazott eszk\u00f6z\u00f6kre alkalmazhat\u00f3 kieg\u00e9sz\u00edt\u0151 a Sambahoz, amely sz\u00fcks\u00e9g eset\u00e9n integr\u00e1lhat\u00f3 a Samba eszk\u00f6zeivel \u00e9s k\u00f6nyvt\u00e1raival. A ksmbd k\u00f3dj\u00e1t Namjae Jeon a Samsungt\u00f3l \u00e9s Hyunchul Lee az LG-t\u0151l \u00edrta, m\u00edg a mag kernel t\u00e1mogat\u00e1s\u00e1t Steve French, a Microsoft CIFS\/SMB2\/SMB3 alrendszer\u00e9nek karbantart\u00f3ja \u00e9s a Samba fejleszt\u0151i csapat\u00e1nak r\u00e9g\u00f3ta akt\u00edv tagja v\u00e9gzi, aki jelent\u0151s hozz\u00e1j\u00e1rul\u00e1st tett az SMB\/CIFS protokollok t\u00e1mogat\u00e1s\u00e1nak megval\u00f3s\u00edt\u00e1s\u00e1ban a Samba \u00e9s a Linux sz\u00e1m\u00e1ra. \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\udd47Vulnerabilit\u00e1s a Linux kernel ksmbd modulj\u00e1ban, amely lehet\u0151v\u00e9 teszi a t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st | ProHoster","description":"A ksmbd modulban, amely a Linux kernelbe integr\u00e1lt SMB protokoll alap\u00fa f\u00e1jlszerver megval\u00f3s\u00edt\u00e1s\u00e1t tartalmazza, kritikus sebezhet\u0151s\u00e9get azonos\u00edtottak, amely lehet\u0151v\u00e9 teszi, hogy t\u00e1volr\u00f3l k\u00f3dot futtassanak kernel jogokkal.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-module-ksmbd-yadra-linux-pozvolyayushhaya-udalyonno-vypolnit-svoj-kod","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 ksmbd \u044f\u0434\u0440\u0430 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \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 \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.","og:url":"https:\/\/prohoster.info\/hu\/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\/hu\/wp-json\/wp\/v2\/posts\/106241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=106241"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/106241\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=106241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=106241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=106241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"