{"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\/et\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","title":{"rendered":"Linuxi tuumas on tuvastatud haavatavused nf_tables, watch_queue ja IPsec","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Linuxi tuumas avastati mitu ohtlikku haavatavust, mis lubavad kohalikul kasutajal oma \u00f5igusi s\u00fcsteemis t\u00f5sta. K\u00f5igi k\u00e4sitletud probleemide jaoks on valmistatud t\u00f6\u00f6protot\u00fc\u00fcbid eksploiteerimiseks.    <\/p>\n<ul>\n<li class=\"l\"> Haavatavus (CVE-2022-0995) \u00fcritab j\u00e4lgimis\u00fcrituste s\u00fcsteemis watch_queue kirjutada andmeid m\u00e4lupiirkondadesse, mis \u00fcletavad eraldatud puhvrise. R\u00fcnnakut saab teostada iga mitteprivilegeeritud kasutaja ja see v\u00f5ib viia isikliku koodi k\u00e4ivitamiseni tuumapoolsete \u00f5igustega. Haavatavus on olemas funktsioonis watch_queue_set_size() ning on seotud k\u00f5igi n\u00e4idikute puhastamisega loendis, isegi kui neile ei ole m\u00e4lu eraldatud. Probleem ilmneb, kui tuum on kokku pandud valiku &#171;CONFIG_WATCH_QUEUE=y&#187;ga, mida kasutatakse enamikus Linuxi jaotustes.\n<p>Haavatavus on k\u00f5rvaldatud muudatusega, mis lisati tuumale 11. m\u00e4rtsil. Pakettide v\u00e4rskenduste v\u00e4ljaandmist distributsioonides saab j\u00e4lgida j\u00e4rgmistelt lehtedelt: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Eksploteerimise t\u00f6\u00f6protot\u00fc\u00fcp on juba avalikult saadaval ja v\u00f5imaldab saada root-juurdep\u00e4\u00e4su, kui seda k\u00e4ivitada Ubuntu 21.10 tuumaga 5.13.0-37.      <center><img decoding=\"async\" alt=\"Linuxi tuumas on tuvastatud haavatavused nf_tables, watch_queue ja IPsec\" src=\"\/wp-content\/uploads\/2022\/03\/9cdfd5bdf66d257757d1a4c600b96249.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<li class=\"l\"> Haavatavus (CVE-2022-27666) tuuma moodulites esp4 ja esp6, mis rakendavad ESP-muundamisi (Encapsulating Security Payload) IPsec-i jaoks, mida kasutatakse IPv4 ja IPv6 korral. Haavatavus v\u00f5imaldab kohalikel kasutajatel, kellel on tavalised \u00f5igused, tuuma m\u00e4lu objekte \u00fcle kirjutada ja oma \u00f5igusi s\u00fcsteemis suurendada. Probleem tuleneb eraldatud m\u00e4lu suuruse ja tegelikult saadud andmete vastavuse kontrollimise puudumisest, kuna maksimaalne s\u00f5numi suurus v\u00f5ib \u00fcletada maksimaalset m\u00e4lu suurust, mis on eraldatud struktuurile skb_page_frag_refill.\n<p>Haavatavus on k\u00f5rvaldatud tuumas 7. m\u00e4rtsil (parandatud versioonides 5.17, 5.16.15 jne). Pakettide v\u00e4rskenduste v\u00e4ljaandmist distributsioonides saab j\u00e4lgida j\u00e4rgmistelt lehtedelt: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Eksploteerimise t\u00f6\u00f6protot\u00fc\u00fcp, mis v\u00f5imaldab tavalisel kasutajal saada root-juurdep\u00e4\u00e4su Ubuntu Desktop 21.10 vaikeseadistustes, on juba \u00fcles laaditud GitHubi. Teadaolevalt t\u00f6\u00f6tab eksploiteerimine ka v\u00e4ikeste muudatuste korral Fedora ja Debianis. Eriti on oluline, et see eksploiteerimine valmistati algselt ette pwn2own 2022 v\u00f5istluste jaoks, kuid tuuma arendajad tuvastasid ja k\u00f5rvaldasid seotud vea, mist\u00f5ttu otsustati avada haavatavuse \u00fcksikasjad.      <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\"> Kaks n\u00f5rkust (CVE-2022-1015, CVE-2022-1016) netfilteri alams\u00fcsteemis nf_tables, mis tagab nftables pakettfiltri toimimise. Esimene probleem v\u00f5imaldab kohalikel, mittepriviligeeritud kasutajatel saavutada m\u00e4lu piiri\u00fcletust st\u00e4kis. \u00dcksk\u00f5ik milliseid preparaadi v\u00e4ljendeid nftables'is t\u00f6\u00f6deldakse, tekib see \u00fcleujutus, kui neid k\u00e4sitletakse kasutaja m\u00e4\u00e4ratud indeksite kontrollimise etapis, kellel on juurdep\u00e4\u00e4s nftables reeglitele.\n<p>Haavatavus on tingitud sellest, et arendajad eeldasid, et v\u00e4\u00e4rtus &#171;enum nft_registers reg&#187; on \u00fcks bait, samas kui teatud optimeerimiste aktiveerimise korral v\u00f5ib kompilaator C89 spetsifitseerimise kohaselt kasutada 32-bitist v\u00e4\u00e4rtust. Antud omaduse t\u00f5ttu ei vasta kontrollimiseks ja m\u00e4lu eraldamiseks kasutatav suurus tegelikele andmestruktuuri m \u00f5\u00f5tmetele, mis toob kaasa struktuuri saba kattumise kuhjade osadega.    <\/p>\n<p>Probleemi saab \u00e4ra kasutada koodi k\u00e4ivitamiseks tuumal, kuid edukaks r\u00fcnnakuks on vajalik juurdep\u00e4\u00e4s nftables'ile, mille saab omada eraldi v\u00f5rgunimede ruumis (network namespaces) CLONE_NEWUSER v\u00f5i CLONE_NEWNET \u00f5iguste abil (n\u00e4iteks, kui on v\u00f5imalus k\u00e4ivitada isoleeritud konteiner). Haavatavus on samuti tihedalt seotud kompilaatori optimeerimistega, mis aktiveeritakse n\u00e4iteks &#171;CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y&#187; re\u017eiimis. Haavatavuse \u00e4rakasutamine on v\u00f5imalik alates Linuxi tuumast 5.12.    <\/p>\n<p>Teine n\u00f5rkus netfilteris on tingitud juba vabastatud m\u00e4lu piirkonna (use-after-free) kasutamisest nft_do_chain t\u00f6\u00f6tlejas ja see v\u00f5ib viia mitteinitsialiseeritud kernelim\u00e4lu piirkondade leketeni, mida saab lugeda nftables'i v\u00e4ljendite manipuleerimise kaudu ja kasutada n\u00e4iteks muude n\u00f5rkuste eksploiteerimise aadresside m\u00e4\u00e4ramiseks. N\u00f5rkus on kasutatav alates Linuxi kernelist 5.13.    <\/p>\n<p>Turval\u00f5rked on k\u00f5rvaldatud t\u00e4nastes tuumav\u00e4rskendustes 5.17.1, 5.16.18, 5.15.32, 5.10.109, 5.4.188, 4.19.237, 4.14.274 ja 4.9.309. Pakettide v\u00e4rskenduste avaldamist jaotustes saab j\u00e4lgida j\u00e4rgmistel lehtedel: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Probleemide tuvastanud teadlane teatas, et on valmistanud t\u00f6\u00f6ks eksploidid m\u00f5lema turvavea jaoks, mis kavatsetakse avaldada m\u00f5ne p\u00e4eva p\u00e4rast, kui jaotused v\u00e4ljastavad tuumaga seotud pakettide v\u00e4rskendused.      <\/ul>\n<p>Allikas: <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 5.0.1.1 - 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