{"id":100599,"date":"2021-06-25T16:22:49","date_gmt":"2021-06-25T14:22:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux"},"modified":"2021-06-25T16:22:49","modified_gmt":"2021-06-25T14:22:49","slug":"uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","title":{"rendered":"Zranite\u013enos\u0165 v eBPF umo\u017e\u0148uj\u00faca vykonanie k\u00f3du na \u00farovni jadra Linuxu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V podsysteme eBPF, ktor\u00e1 umo\u017e\u0148uje sp\u00fa\u0161\u0165anie spracovate\u013eov vo vn\u00fatri jadra Linuxu v \u0161peci\u00e1lnej virtu\u00e1lnej strojovej s JIT, bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2021-3600), ktor\u00e1 umo\u017e\u0148uje lok\u00e1lnemu nepriviligovan\u00e9mu pou\u017e\u00edvate\u013eovi dosiahnu\u0165 vykonanie svojho k\u00f3du na \u00farovni jadra Linuxu. Probl\u00e9m je sp\u00f4soben\u00fd nespr\u00e1vnym zrezan\u00edm 32-bitov\u00fdch registrov pri vykon\u00e1van\u00ed oper\u00e1ci\u00ed «div» a «mod», \u010do m\u00f4\u017ee vies\u0165 k \u010d\u00edtaniu a z\u00e1pisu \u00fadajov mimo pridelen\u00e9ho pam\u00e4\u0165ov\u00e9ho priestoru. <\/p>\n

Zranite\u013enos\u0165 vznikla v d\u00f4sledku nespr\u00e1vneho opravenia 32-bitov\u00e9ho delenia nulou vo verzii 4.15, ktor\u00e1 bola taktie\u017e zanesena do vetiev 4.4.x, 4.9.x a 4.14.x. Vyu\u017eitie zranite\u013enosti je mo\u017en\u00e9 pre jadr\u00e1 od verzie 4.14, v ktorej bola zmenen\u00e1 met\u00f3da sledovania hodn\u00f4t vo verifik\u00e1tore BPF. Probl\u00e9m bol odstr\u00e1nen\u00fd v jadre Linux 5.11. Oprava bola prinesen\u00e1 do vetiev 5.10.x a 5.4.x, ale nebola prenesen\u00e1 do vetiev 4.19.x a 4.14.x. Aktualiz\u00e1cia s opravou zranite\u013enosti bola vydan\u00e1 pre Ubuntu a Debian Sid. Nie je jasn\u00e9, \u010di sa probl\u00e9m prejavuje aj v SUSE a RHEL.
\n
Zdroj: 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 eBPF, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0432\u043d\u0443\u0442\u0440\u0438 \u044f\u0434\u0440\u0430 Linux \u0432 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0439 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 \u043c\u0430\u0448\u0438\u043d\u0435 \u0441 JIT, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3600), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \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 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 Linux. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u044b\u043c \u0443\u0441\u0435\u0447\u0435\u043d\u0438\u0435\u043c 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u0445 \u0440\u0435\u0433\u0438\u0441\u0442\u0440\u043e\u0432 \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 «div» \u0438 «mod», \u0447\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0447\u0442\u0435\u043d\u0438\u044e \u0438 \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0437\u0430 \u0433\u0440\u0430\u043d\u0438\u0446\u0435\u0439 \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0439 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\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-100599","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\udd47Zranite\u013enos\u0165 v eBPF, ktor\u00e1 umo\u017e\u0148uje vykona\u0165 k\u00f3d na \u00farovni jadra Linux | ProHoster","description":"V subsyst\u00e9me eBPF, ktor\u00fd umo\u017e\u0148uje sp\u00fa\u0161\u0165a\u0165 spracovate\u013eov vo vn\u00fatri jadra Linux v \u0161peci\u00e1lnej virtu\u00e1lnej strojovej prostred\u00ed s JIT, bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2021-3600), ktor\u00e1 umo\u017e\u0148uje lok\u00e1lnemu nepriviligovan\u00e9mu pou\u017e\u00edvate\u013eovi dosiahnu\u0165.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","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 eBPF, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 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