{"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\/da\/blog\/news\/uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","title":{"rendered":"S\u00e5rbarhed i eBPF, der g\u00f8r det muligt at udf\u00f8re kode p\u00e5 Linux-kerneniveau","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I subsystemet eBPF, der tillader k\u00f8rsel af behandlere inde i Linux-kernen i en s\u00e6rlig virtuel maskine med JIT, er der opdaget en s\u00e5rbarhed (CVE-2021-3600), som giver en lokal, ikke-privilegeret bruger mulighed for at f\u00e5 sin kode udf\u00f8rt p\u00e5 kerneniveau i Linux. Problemet skyldes en forkert afkortning af 32-bit registre under udf\u00f8relsen af operationerne 'div' og 'mod', hvilket kan f\u00f8re til l\u00e6sning og skrivning af data uden for det tildelte hukommelsesomr\u00e5de. <\/p>\n

S\u00e5rbarheden blev introduceret i den ukorrekte rettelse af 32-bit division med nul i version 4.15, som ogs\u00e5 blev backportet til grene 4.4.x, 4.9.x og 4.14.x. Uds\u00e6ttelse af s\u00e5rbarheden er muligt for kerner fra version 4.14, hvor metoden til sporing af v\u00e6rdier i BPF-verifikatoren blev \u00e6ndret. Problemet er l\u00f8st i Linux-kernen 5.11. Rettelsen er blevet backportet til grene 5.10.x og 5.4.x, men ikke overf\u00f8rt til grene 4.19.x og 4.14.x. Opdateringer med rettelsen af s\u00e5rbarheden er blevet udgivet for Ubuntu og Debian Sid. Det er endnu uklart, om problemet ogs\u00e5 forekommer i SUSE og RHEL.
\n
Kilde: 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\udd47S\u00e5rbarhed i eBPF, der tillader udf\u00f8relse af kode p\u00e5 kerne-niveau i Linux | ProHoster","description":"I eBPF-underdelssystemet, der muligg\u00f8r k\u00f8rsel af behandlere inden for Linux-kernen i en speciel virtuel maskine med JIT, er der blevet opdaget en s\u00e5rbarhed (CVE-2021-3600), som tillader en lokal, ikke-privilegeret bruger at opn\u00e5.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","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 \u044f\u0434\u0440\u0430 Linux | ProHoster","og:description":"\u0412 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