{"id":104585,"date":"2022-07-03T15:36:40","date_gmt":"2022-07-03T13:36:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii"},"modified":"2022-07-03T15:36:40","modified_gmt":"2022-07-03T13:36:40","slug":"lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Lok\u00e1lna zranite\u013enos\u0165 v nftables, ktor\u00e1 umo\u017e\u0148uje zv\u00fd\u0161i\u0165 svoje privil\u00e9gia","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V Netfilter, podsysteme jadra Linux, ktor\u00e1 sa pou\u017e\u00edva na filtrovanie a modifik\u00e1ciu sie\u0165ov\u00fdch paketov, bola zisten\u00e1 zranite\u013enos\u0165 (CVE nie je priraden\u00e9), ktor\u00e1 umo\u017e\u0148uje lok\u00e1lnemu pou\u017e\u00edvate\u013eovi vykona\u0165 k\u00f3d na \u00farovni jadra a zv\u00fd\u0161i\u0165 svoje privil\u00e9gi\u00e1 v syst\u00e9me. V\u00fdskumn\u00edci demon\u0161trovali exploit, ktor\u00fd umo\u017enil lok\u00e1lnemu pou\u017e\u00edvate\u013eovi z\u00edska\u0165 pr\u00e1va root v Ubuntu 22.04 s jadrom 5.15.0-39-generic. P\u00f4vodne sa malo s inform\u00e1ciou o zranite\u013enosti zverejni\u0165 15. augusta, ale kv\u00f4li skop\u00edrovaniu listu s prototypom exploitu na verejn\u00fd mailing list, bolo embargo na zverejnenie inform\u00e1ci\u00ed zru\u0161en\u00e9. <\/p>\n

Probl\u00e9m sa objavuje od vydania jadra 5.8 a je sp\u00f4soben\u00fd prete\u010den\u00edm vyrovn\u00e1vacej pam\u00e4te v k\u00f3de pre spracovanie set-zoznamov v module nf_tables, ktor\u00e9 nastalo z d\u00f4vodu absencie riadneho overovania v funkcii nft_set_elem_init. Chyba bola zaveden\u00e1 v zmene, ktor\u00e1 roz\u0161iruje oblas\u0165 ukladania pre prvky zoznamu na 128 bajtov. <\/p>\n

Na uskuto\u010dnenie \u00fatoku je potrebn\u00fd pr\u00edstup k nftables, ktor\u00fd je mo\u017en\u00e9 z\u00edska\u0165 v samostatnom sie\u0165ovom mennom priestore (network namespaces) pri pr\u00edtomnosti pr\u00e1v CLONE_NEWUSER, CLONE_NEWNS alebo CLONE_NEWNET (napr\u00edklad pri mo\u017enosti sp\u00fa\u0161\u0165a\u0165 izolovan\u00fd kontajner). Oprava zatia\u013e nie je k dispoz\u00edcii. Na zablokovanie zneu\u017e\u00edvania zranite\u013enosti v be\u017en\u00fdch syst\u00e9moch by sa malo zabezpe\u010di\u0165, \u017ee nebud\u00fa m\u00f4c\u0165 nepriviligovan\u00ed pou\u017e\u00edvatelia vytv\u00e1ra\u0165 menn\u00e9 priestory (\u201esudo sysctl -w kernel.unprivileged_userns_clone=0\u201c).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 Netfilter, \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 Linux, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0439 \u0434\u043b\u044f \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u0438 \u043c\u043e\u0434\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE \u043d\u0435 \u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u0438 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442, \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0432\u0448\u0438\u0439 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 Ubuntu 22.04 \u0441 \u044f\u0434\u0440\u043e\u043c 5.15.0-39-generic. \u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043b\u043e\u0441\u044c \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u0442\u044c 15 \u0430\u0432\u0433\u0443\u0441\u0442\u0430, \u043d\u043e […]<\/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-104585","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\udd47Lok\u00e1lna zranite\u013enos\u0165 v nftables, ktor\u00e1 umo\u017e\u0148uje zv\u00fd\u0161i\u0165 pr\u00e1va | ProHoster","description":"V Netfilter, podsysteme jadra Linux, ktor\u00e1 sa pou\u017e\u00edva na filtrovanie a modifik\u00e1ciu sie\u0165ov\u00fdch paketov, bola zisten\u00e1 zranite\u013enos\u0165 (CVE nie je priraden\u00e9), ktor\u00e1 umo\u017e\u0148uje lok\u00e1lnemu pou\u017e\u00edvate\u013eovi vykona\u0165 k\u00f3d na \u00farovni jadra a zv\u00fd\u0161i\u0165 svoje.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii","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\u041b\u043e\u043a\u0430\u043b\u044c\u043d\u0430\u044f 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