{"id":103645,"date":"2022-03-29T15:37:18","date_gmt":"2022-03-29T13:37:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec"},"modified":"2022-03-29T15:37:18","modified_gmt":"2022-03-29T13:37:19","slug":"v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","title":{"rendered":"U kernelu Linux otkrivene su iskori\u0161tive ranjivosti u nf_tables, watch_queue i IPsec","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>U kernelu Linux otkrivene su nekoliko opasnih ranjivosti koje omogu\u0107uju lokalnom korisniku pove\u0107anje njegovih privilegija u sustavu. Za sve razmotrene probleme pripremljeni su radni prototipovi eksploita.    <\/p>\n<ul>\n<li class=\"l\"> Ranljivost (CVE-2022-0995) u podkomponenti za pra\u0107enje doga\u0111aja watch_queue koja dovodi do zapisivanja podataka u podru\u010dje memorije jezgre izvan dodeljenog bafera. Napad mo\u017ee izvesti bilo koji neprivilegirani korisnik i dovesti do izvr\u0161avanja svog koda sa pravima jezgre. Ranljivost je prisutna u funkciji watch_queue_set_size() i povezana je s poku\u0161ajem brisanja svih pokaziva\u010da u listi, \u010dak i kada za njih nije dodeljena memorija. Problem se manifestuje kod kompajliranja jezgre sa opcijom 'CONFIG_WATCH_QUEUE=y', koja se koristi u ve\u0107ini Linux distribucija.\n<p>Ranjivost je otklonjena u promjeni dodanoj u kernel 11. o\u017eujka. Pra\u0107enje objave a\u017euriranja paketa u distribucijama mo\u017ee se obaviti na sljede\u0107im stranicama: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Prototip eksploita ve\u0107 je javno dostupan i omogu\u0107uje dobivanje root pristupa kada se pokrene u Ubuntu 21.10 s kernelom 5.13.0-37.      <center><img decoding=\"async\" alt=\"U kernelu Linux otkrivene su iskori\u0161tive ranjivosti u nf_tables, watch_queue i IPsec\" src=\"\/wp-content\/uploads\/2022\/03\/9cdfd5bdf66d257757d1a4c600b96249.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<li class=\"l\"> Ranjivost (CVE-2022-27666) u modulima jezgre esp4 i esp6 s implementacijom ESP transformacija (Encapsulating Security Payload) za IPsec, koje se koriste pri kori\u0161tenju IPv4 i IPv6. Ranjivost omogu\u0107uje lokalnom korisniku s obi\u010dnim privilegijama da prepisuje objekte u memoriji jezgre i pove\u0107a svoje privilegije u sustavu. Problem je izazvan nedostatkom provjere dodijeljenog veli\u010dine memorije i stvarno primljenih podataka, pri \u010demu maksimalna veli\u010dina poruke mo\u017ee prema\u0161ivati maksimalnu veli\u010dinu memorije dodijeljene za strukturu skb_page_frag_refill.\n<p>Ranljivost je ispravljena u jezgru 7. marta (ispravljena u 5.17, 5.16.15 itd.). Pra\u0107enje objava a\u017euriranja paketa u distribucijama mo\u017ee se izvr\u0161iti na slede\u0107im stranicama: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Radni prototip exploit-a, koji omogu\u0107ava obi\u010dnom korisniku da dobije root pristup u Ubuntu Desktop 21.10 u podrazumevanoj konfiguraciji, ve\u0107 je postavljen na GitHub. Navodi se da \u0107e exploit, uz male izmene, tako\u0111e raditi na Federaciji i Debijanu. Zanimljivo je da je exploit prvobitno pripremljen za takmi\u010denje pwn2own 2022, ali su programeri jezgra otkrili i ispravili povezanu gre\u0161ku, pa je odlu\u010deno da budu otkriveni detalji ranjivosti.      <center>  <video controls=\"\" style=\"width: 720px; height: 480px; max-width:100%\" src=\"https:\/\/etenal.me\/wp-content\/uploads\/2022\/03\/yes_root.mp4\" ><source src=\"https:\/\/etenal.me\/wp-content\/uploads\/2022\/03\/yes_root.mp4\" type=\"video\/mp4\"><\/video><\/center>    <\/p>\n<li class=\"l\"> Dve ranjivosti (CVE-2022-1015, CVE-2022-1016) u podsklopu netfilter u modulu nf_tables, koji osigurava rad paketnog filtra nftables. Prvi problem omogu\u0107ava lokalnom nepovla\u0161\u0107enog korisniku da zapi\u0161e izvan dodeljenog bafera na steku. Prelivanje se doga\u0111a prilikom obrade odre\u0111enih na na\u010din oblikovanih izraza nftables, obra\u0111ivanih u fazi provere indeksa koje postavlja korisnik sa pristupom pravilima nftables.\n<p>Ranljivost je uzrokovana time \u0161to su programeri pretpostavili da je vrednost 'enum nft_registers reg' jedan bajt, dok prilikom aktiviranja odre\u0111enih optimizacija kompajler prema specifikaciji C89 mo\u017ee koristiti 32-bitnu vrednost. Zbog navedene osobine, veli\u010dina kori\u0161\u0107ena za proveru i dodeljivanje memorije ne odgovara stvarnoj veli\u010dini podataka u strukturi, \u0161to dovodi do preklapanja repa strukture sa pokaziva\u010dima na steku.    <\/p>\n<p>Problemu se mo\u017ee pristupiti za izvr\u0161avanje sopstvenog koda na nivou jezgre, ali za uspe\u0161an napad potrebno je imati pristup nftables, koji se mo\u017ee dobiti u odvojenom mre\u017enom prostoru imena (network namespaces) uz prava CLONE_NEWUSER ili CLONE_NEWNET (na primer, uz mogu\u0107nost pokretanja izolovanog kontejnera). Ranljivost je tako\u0111e usko povezana sa optimizacijama koje primenjuje kompajler, koje se aktiviraju prilikom kompajliranja u re\u017eimu 'CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y'. Eksploatacija ranljivosti mogu\u0107a je po\u010dev\u0161i od jezgre Linux 5.12.    <\/p>\n<p>Druga ranjivost u netfilteru uzrokovana je pristupom ve\u0107 oslobo\u0111enom dijelu memorije (use-after-free) u handleru nft_do_chain i mo\u017ee dovesti do curenja neinicijaliziranih podru\u010dja memorije jezgre, koja se mogu pro\u010ditati manipulacijama izrazima nftables i iskoristiti, na primjer, za odre\u0111ivanje adresa pokaziva\u010da prilikom razvoja eksploita za druge ranjivosti. Eksploatacija ranjivosti mogu\u0107a je po\u010dev\u0161i od Linux jezgre 5.13.    <\/p>\n<p>Ranjivosti su otklonjene u dana\u0161njim ispravnim a\u017euriranjima jezgre 5.17.1, 5.16.18, 5.15.32, 5.10.109, 5.4.188, 4.19.237, 4.14.274 i 4.9.309. Pra\u0107enje objava a\u017euriranja paketa u distribucijama mo\u017ee se izvr\u0161iti na ovim stranicama: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Istra\u017eiva\u010d koji je otkrio probleme izjavio je da priprema funkcionalne eksploitne alate za obje ranjivosti, koje planira objaviti za nekoliko dana, nakon \u0161to distribucije objave a\u017euriranja paketa s jezgrom.      <\/ul>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56931\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043e\u043f\u0430\u0441\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0414\u043b\u044f \u0432\u0441\u0435\u0445 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u044b \u0440\u0430\u0431\u043e\u0447\u0438\u0435 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-0995) \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0431\u044b\u0442\u0438\u0439 watch_queue, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u043e\u043c \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430. \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u043b\u044e\u0431\u044b\u043c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0438 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0437\u0430\u043f\u0443\u0441\u043a\u0443 \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103646,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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Za sve razmotrene probleme pripremljeni su radni prototipovi eksploita.","canonical_url":"https:\/\/prohoster.info\/hr\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","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\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u044b\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 nf_tables, watch_queue \u0438 IPsec | 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