{"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\/et\/blog\/news\/uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","title":{"rendered":"eBPF haavatavus, mis v\u00f5imaldab koodi k\u00e4ivitamist Linuxi tuumas","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

eBPF alams\u00fcsteemis, mis v\u00f5imaldab k\u00e4itada t\u00f6\u00f6tlejat Linuxi tuumas spetsiaalses JIT-iga virtuaalmasinas, on avastatud haavatavus (CVE-2021-3600), mis v\u00f5imaldab kohalikel, madala privileegiga kasutajatel k\u00e4ivitada oma koodi Linuxi tuuma tasemel. Probleem tuleneb 32-bitiste registeride vale l\u00f5ikamise t\u00f5ttu operatsioonide \"div\" ja \"mod\" k\u00e4ivitamisel, mis v\u00f5ib viia andmete lugemise ja kirjutamiseni v\u00e4ljaspool eraldatud m\u00e4luala. <\/p>\n

Haavatavus on seotud vale 32-bitise nullil divisjoni parandamisega versioonis 4.15, mis on samuti tagasi portitud harudesse 4.4.x, 4.9.x ja 4.14.x. Haavatavuse \u00e4rakasutamine on v\u00f5imalik tuumade puhul, alates versioonist 4.14, kus muudeti v\u00e4\u00e4rtuste j\u00e4lgimise meetodit BPFi valideerijas. Probleem on lahendatud Linuxi tuumas 5.11. Parandus on tagasi portitud harudesse 5.10.x ja 5.4.x, kuid ei ole kantud harudesse 4.19.x ja 4.14.x. Parandusega uuendus on v\u00e4lja antud Ubuntu ja Debian Sid jaoks. Ei ole selge, kas probleem ilmneb SUSE ja RHEL korral.
\n
Allikas: 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\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\udd47eBPF haavatavus, mis v\u00f5imaldab koodi t\u00e4itmist Linuxi tuuma tasemel | ProHoster","description":"eBPF alams\u00fcsteemis, mis v\u00f5imaldab k\u00e4ivitada t\u00f6\u00f6tlejaid Linuxi tuumas spetsiaalses JIT virtuaalmasinas, on tuvastatud haavatavus (CVE-2021-3600), mis v\u00f5imaldab kohalikul erinevatel \u00f5igusteta kasutajal 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