{"id":113232,"date":"2024-01-29T18:50:31","date_gmt":"2024-01-29T16:50:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda"},"modified":"2024-01-29T18:50:31","modified_gmt":"2024-01-29T16:50:31","slug":"uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Ranljivost u IPv6 steku jezgre Linuxa koja dopu\u0161ta daljinsko izvr\u0161avanje koda","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Otkrivena je informacija o ranjivosti CVE-2023-6200 u mre\u017enom steku Linux jezgre, koja pod odre\u0111enim okolnostima omogu\u0107uje napada\u010du iz lokalne mre\u017ee da izvr\u0161i svoj kod slanjem posebno oblikovanog ICMPv6 paketa s RA (Router Advertisement) porukom koja slu\u017ei za ogla\u0161avanje informacija o usmjeriva\u010du. <\/p>\n

Ran vulnerabilnost se mo\u017ee iskoristiti samo iz lokalne mre\u017ee i pojavljuje se u sustavima s uklju\u010denom podr\u0161kom za IPv6 i aktivnim sysctl parametrima \"net.ipv6.conf..accept_ra\" (mo\u017ee se provjeriti naredbom \"sysctl net.ipv6.conf| grep accept_ra\"), koja je prema zadanim postavkama isklju\u010dena u RHEL-u i Ubuntu za vanjske mre\u017ene su\u010delja, ali je uklju\u010dena za loopback su\u010delje, \u0161to omogu\u0107uje napad s iste sustava. <\/p>\n

Ranjivost je uzrokovana stanjem utrke prilikom obrade zastarjelih zapisa fib6_info od strane sakuplja\u010da sme\u0107a, \u0161to mo\u017ee dovesti do pristupa ve\u0107 oslobo\u0111enom dijelu memorije (use-after-free). Kada mre\u017eni stek primi ICMPv6 paket s oglasnom porukom usmjeriva\u010da (RA, Router Advertisement), poziva se funkcija ndisc_router_discovery(), koja, ako u RA poruci postoje podaci o vremenu trajanja rute, poziva funkciju fib6_set_expires() i popunjava strukturu gc_link. Za \u010di\u0161\u0107enje zastarjelih zapisa koristi se funkcija fib6_clean_expires(), koja odspaja zapis u gc_link i \u010disti memoriju koju koristi struktura fib6_info. U tom trenutku postoji odre\u0111eni trenutak kada je memorija za strukturu fib6_info ve\u0107 oslobo\u0111ena, ali referenca na nju i dalje se nalazi u strukturi gc_link. <\/p>\n

Vulnerabilnost se pojavljuje od verzije 6.6 i ispravljena je u verzijama 6.6.9 i 6.7. Status ispravka ranjivosti u distribucijama mo\u017ee se procijeniti na ovim stranicama: Debian, Ubuntu, SUSE, RHEL, Fedora, Arch Linux, Gentoo, Slackware. Od distribucija koje instaliraju pakete s kernelom 6.6, mo\u017eemo spomenuti Arch Linux, Gentoo, Fedora, Slackware, OpenMandriva i Manjaro, dok u ostalim distribucijama nije isklju\u010deno backportiranje promjena s gre\u0161kom u pakete s starijim verzijama kernela (na primjer, u Debianu se spominje da je ranjiv paket s kernelom 6.5.13, dok je problemati\u010dna promjena nastala u verziji 6.6). Kao zaobilazno rje\u0161enje za\u0161tite mo\u017ee se isklju\u010diti IPv6 ili postaviti vrijednost 0 za parametre \"net.ipv6.conf.*.accept_ra\".
\n
Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CVE-2023-6200) \u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u0441\u0442\u0435\u043a\u0435 \u044f\u0434\u0440\u0430 Linux, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u043e\u0431\u0441\u0442\u043e\u044f\u0442\u0435\u043b\u044c\u0441\u0442\u0432\u0430\u0445 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u0438\u0437 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438 \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 \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 \u043f\u0430\u043a\u0435\u0442\u0430 ICMPv6 \u0441 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435\u043c RA (Router Advertisement), \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u043c \u0434\u043b\u044f \u0430\u043d\u043e\u043d\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0438\u0437 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 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informacija o ranjivosti CVE-2023-6200 u mre\u017enom steku Linux jezgre, koja pod odre\u0111enim okolnostima omogu\u0107ava napada\u010du iz lokalne mre\u017ee da izvr\u0161i svoj kod putem slanja.","canonical_url":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hr_HR","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 IPv6-\u0441\u0442\u0435\u043a\u0435 \u044f\u0434\u0440\u0430 Linux, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CVE-2023-6200) \u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u0441\u0442\u0435\u043a\u0435 \u044f\u0434\u0440\u0430 Linux, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u043e\u0431\u0441\u0442\u043e\u044f\u0442\u0435\u043b\u044c\u0441\u0442\u0432\u0430\u0445 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u0438\u0437 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 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