V jedru Linux je bila odkrita ranljivost (CVE-2022-42896), ki se lahko potencialno izkoristi za oddaljeno izvajanje kode na ravni jedra z po\u0161iljanjem posebej oblikovane L2CAP-paketne preko Bluetooth. Poleg tega je bila odkrita \u0161e ena podobna te\u017eava (CVE-2022-42895) v obdelovalniku L2CAP, ki lahko vodi do uhajanja vsebine jedrske pomnilnika v paketih z informacijami o konfiguraciji. Prva ranljivost se pojavlja od avgusta 2014 (jedro 3.16), druga pa od oktobra 2011 (jedro 3.0). Ranljivosti so bile odpravljene v izdajah jedra Linux 6.1.0, 6.0.8, 4.9.333, 4.14.299, 4.19.265, 5.4.224, 5.10.154 in 5.15.78. Odprave lahko spremljate v distribucijah na naslednjih straneh: Debian, Ubuntu, Gentoo, RHEL, SUSE, Fedora, Arch. <\/p>\n
\u0414\u043b\u044f \u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0430\u0446\u0438\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0439 \u0430\u0442\u0430\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0435 \u0432 Ubuntu 22.04. \u0414\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a \u0434\u043e\u043b\u0436\u0435\u043d \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u043f\u0440\u0435\u0434\u0435\u043b\u0430\u0445 \u0434\u043e\u0441\u044f\u0433\u0430\u0435\u043c\u043e\u0441\u0442\u0438 Bluetooth — \u043f\u0440\u0435\u0434\u0432\u0430\u0440\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0441\u043e\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u043d\u0435 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f, \u043d\u043e \u043d\u0443\u0436\u043d\u043e \u0447\u0442\u043e\u0431\u044b \u043d\u0430 \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u0435 \u0431\u044b\u043b \u0430\u043a\u0442\u0438\u0432\u0435\u043d Bluetooth. \u0414\u043b\u044f \u0430\u0442\u0430\u043a\u0438 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0437\u043d\u0430\u0442\u044c MAC-\u0430\u0434\u0440\u0435\u0441 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \u0436\u0435\u0440\u0442\u0432\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d \u043f\u0443\u0442\u0451\u043c \u0441\u043d\u0438\u0444\u0438\u043d\u0433\u0430 \u0438\u043b\u0438 \u043d\u0430 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 MAC-\u0430\u0434\u0440\u0435\u0441\u0430 Wi-Fi. <\/p>\n
\u041f\u0435\u0440\u0432\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-42896) \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435\u043c \u043a \u0443\u0436\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u043e\u0439 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 (use-after-free) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u0439 l2cap_connect \u0438 l2cap_le_connect_req — \u043f\u043e\u0441\u043b\u0435 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043a\u0430\u043d\u0430\u043b\u0430 \u0447\u0435\u0440\u0435\u0437 callback-\u0432\u044b\u0437\u043e\u0432 new_connection, \u0434\u043b\u044f \u043d\u0435\u0433\u043e \u043d\u0435 \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u044f\u043b\u0430\u0441\u044c \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0430, \u043d\u043e \u043d\u0430\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u043b\u0441\u044f \u0442\u0430\u0439\u043c\u0435\u0440 (__set_chan_timer), \u043f\u043e \u0438\u0441\u0442\u0435\u0447\u0435\u043d\u0438\u044e \u0442\u0430\u0439\u043c\u0430\u0443\u0442\u0430 \u0432\u044b\u0437\u044b\u0432\u0430\u044e\u0449\u0438\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u044e l2cap_chan_timeout \u0438 \u043e\u0447\u0438\u0449\u0430\u044e\u0449\u0438\u0439 \u043a\u0430\u043d\u0430\u043b \u0431\u0435\u0437 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u043a\u0430\u043d\u0430\u043b\u043e\u043c \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u0445 l2cap_le_connect*. <\/p>\n
Privzeti \u010dasovni interval zna\u0161a 40 sekund in se je domnevalo, da stanje dirke pri taki zamudi ne more nastati, a se je izkazalo, da se lahko zaradi druge napake v obdelovalniku SMP dose\u017ee takoj\u0161nje klicanje \u010dasovnika in stanje dirke. Te\u017eava v l2cap_le_connect_req lahko vodi do uhajanja jedrskega pomnilnika, v l2cap_connect pa do prepisovanja vsebine pomnilnika in izvajanja lastne kode. Prvi na\u010din napada se lahko izvede z uporabo Bluetooth LE 4.0 (od leta 2009), drugi pa z uporabo Bluetooth BR\/EDR 5.2 (od leta 2020). <\/p>\n
Druga ranjivost (CVE-2022-42895) je uzrokovana curenjem preostalih podataka iz memorije u funkciji l2cap_parse_conf_req, \u0161to mo\u017ee omogu\u0107iti daljinsko dobijanje informacija o pokaziva\u010dima na strukture jezgra putem slanja posebno oblikovanih konfiguracionih zahteva. U funkciji l2cap_parse_conf_req kori\u0161\u0107ena je struktura l2cap_conf_efs, za koju nije izvr\u0161ena prethodna inicijalizacija dodeljene memorije, i manipuli\u0161u\u0107i sa flagom FLAG_EFS_ENABLE moglo je do\u0107i do uklju\u010divanja starih podataka iz steka u paket. Problem se javlja samo u sistemima gde je jezgro sastavljeno sa opcijom CONFIG_BT_HS (po defaultu isklju\u010dena, ali aktivirana u nekim distribucijama, na primer, u Ubuntu). Za uspe\u0161an napad tako\u0111e je potrebno postaviti parametar HCI_HS_ENABLED preko upravlja\u010dkog interfejsa na true (po defaultu nije kori\u0161\u0107en). \u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-42896), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e L2CAP-\u043f\u0430\u043a\u0435\u0442\u0430 \u0447\u0435\u0440\u0435\u0437 Bluetooth. \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0435\u0449\u0451 \u043e\u0434\u043d\u0430 \u043f\u043e\u0445\u043e\u0436\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 (CVE-2022-42895) \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 L2CAP, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0442\u0435\u0447\u043a\u0435 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 \u0432 \u043f\u0430\u043a\u0435\u0442\u0430\u0445 \u0441\u043e \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f\u043c\u0438 \u043e \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438. \u041f\u0435\u0440\u0432\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0441 \u0430\u0432\u0433\u0443\u0441\u0442\u0430 […]<\/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-106088","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\udd47Ranjivosti u jezgru Linuxa, daljinski iskori\u0161\u0107ene putem Bluetooth-a | ProHoster","description":"U jezgru Linuxa otkrivena je ranjivost (CVE-2022-42896), koja se potencijalno mo\u017ee iskoristiti za organizovanje daljinskog izvr\u0161avanja koda na nivou jezgra slanjem posebno oblikovanog L2CAP paketa.","canonical_url":"https:\/\/prohoster.info\/sl\/blog\/news\/uyazvimosti-v-yadre-linux-udalyonno-ekspluatiruemye-cherez-bluetooth","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sl_SI","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\u0438 \u0432 \u044f\u0434\u0440\u0435 Linux, \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u044b\u0435 \u0447\u0435\u0440\u0435\u0437 Bluetooth | ProHoster","og:description":"\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-42896), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e L2CAP-\u043f\u0430\u043a\u0435\u0442\u0430 \u0447\u0435\u0440\u0435\u0437.","og:url":"https:\/\/prohoster.info\/sl\/blog\/news\/uyazvimosti-v-yadre-linux-udalyonno-ekspluatiruemye-cherez-bluetooth","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":"2022-12-15T11:06:35+00:00","article:modified_time":"2022-12-15T11:06:35+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\/sl\/wp-json\/wp\/v2\/posts\/106088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/sl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/sl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sl\/wp-json\/wp\/v2\/comments?post=106088"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/sl\/wp-json\/wp\/v2\/posts\/106088\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/sl\/wp-json\/wp\/v2\/media?parent=106088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/sl\/wp-json\/wp\/v2\/categories?post=106088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/sl\/wp-json\/wp\/v2\/tags?post=106088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"