{"id":107498,"date":"2023-03-24T12:48:20","date_gmt":"2023-03-24T10:48:20","guid":{"rendered":"https:\/\/prohoster.info\/?p=107498"},"modified":"2023-03-24T20:21:30","modified_gmt":"2023-03-24T18:21:30","slug":"uyazvimost-v-overlayfs-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-overlayfs-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"OverlayFS haavatavus, mis v\u00f5imaldab privileegide t\u00f5stmist","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Linuxi tuumas tuvastati OverlayFS failis\u00fcsteemi rakenduses haavatavus (CVE-2023-0386), mida saab kasutada root-juurdep\u00e4\u00e4su saavutamiseks s\u00fcsteemides, kus on installitud FUSE alams\u00fcsteem ja mis lubab OverlayFS jaotiste mountimist mitteprivilegeeritud kasutajate poolt (alates Linux tuumast 5.11, kui on lubatud mitteprivilegeeritud user namespace). Probleem on lahendatud tuuma harus 6.2. Pakettide v\u00e4rskenduste avaldamist distributsioonides saab j\u00e4lgida lehtedelt: Debian, Ubuntu, Gentoo, RHEL, SUSE, Fedora, Arch.           <\/p>\n<p>R\u00fcnnak toimub setgid\/setuid-failide kopeerimise kaudu jaotust, mis on mountitud nosuid-re\u017eiimis, OverlayFS jaotusse, millel on kiht, mis on seotud jaotusega, mis lubab suid-failide t\u00e4itmist. Haavatavus on sarnane probleemiga CVE-2021-3847, mis tuvastati 2021. aastal, kuid n\u00f5uab madalamaid ekspluatatsioonin\u00f5udeid \u2014 vanas probleemis tuli manipuleerida xattrs'iga, mis on \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043aatsiooni (user namespace) kasutamisest piiratud, samas kui uues probleemis kasutatakse setgid\/setuid-bitte, mida ei t\u00f6\u00f6delda spetsiaalselt \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043aatsiooni ruumis.    <\/p>\n<p>R\u00fcnnaku algoritm:  <\/p>\n<ul>\n<li class=\"l\"> FUSE alams\u00fcsteemi abil monteeritakse failis\u00fcsteem, kus on root kasutajale kuuluv setuid\/setgid-flaggidega t\u00e4idetav fail, mis on k\u00f5igile kasutajatele kirjutatava juurdep\u00e4\u00e4suga. FUSE seadistab monteerimisel re\u017eiimi \u00abnosuid\u00bb.\n<li class=\"l\"> Kasutaja ja monteerimisruumid t\u00fchistatakse (unshare).\n<li class=\"l\"> Monteeritakse OverlayFS, m\u00e4\u00e4rates varem FUSE failis\u00fcsteemis loodud alumise kihi ja \u00fclemise kihi, mis p\u00f5hineb kirjutus\u00f5igusega kataloogil. \u00dclemine kiht peab asuma failis\u00fcsteemis, mille monteerimisel ei kasutata flaggi \u00abnosuid\u00bb.\n<li class=\"l\"> FUSE-osade suid-faili aegumisaega muudetakse utiliidi touch abil, mis viib selle kopeerimiseni OverlayFS \u00fclemisse kihti.\n<li class=\"l\"> Kopeerimise k\u00e4igus ei eemaldata kernelis setgid\/setuid lippe, mis toob kaasa faili ilmumise kehtivasse setgid\/setuid t\u00f6\u00f6tlemise jaotisse.\n<li class=\"l\"> Root \u00f5iguste saamiseks piisab, kui k\u00e4ivitada setgid\/setuid lippudega fail OverlayFS \u00fclemisest kihist.  <\/ul>\n<p>Lisaks v\u00f5ib m\u00e4rkida Google Project Zero meeskonna uurijate avastatud kolme haavatavuse teavet, mis parandati Linuxi 5.15 tuuma p\u00f5hiharus, kuid ei ole kantud RHEL 8.x\/9.x ja CentOS Stream 9 tuumade paketidesse.  <\/p>\n<ul>\n<li class=\"l\"> CVE-2023-1252 \u2014 juurdep\u00e4\u00e4s juba vabastatud m\u00e4lupiirkonnale struktuuris ovl_aio_req, mis toimub mitme toimingu kaudu samal ajal OverlayFS-is, mis on loodud Ext4 failis\u00fcsteemi peale. Potentsiaalselt v\u00f5ib see haavatavus v\u00f5imaldada s\u00fcsteemis privileegide t\u00f5stmist.\n<li class=\"l\"> CVE-2023-0590 \u2014 juurdep\u00e4\u00e4s juba vabastatud m\u00e4lupiirkonnale funktsioonis qdisc_graft(). Eeldatakse, et ekspluateerimine piirduks s\u00fcsteemi kokkuvarisemisega.\n<li class=\"l\"> CVE-2023-1249 \u2014 juurdep\u00e4\u00e4s juba vabastatud m\u00e4lupiirkonnale coredump kirjutamise koodis, mis tuleneb mmap_locki kutsumise vahelej\u00e4tmisest file_files_note'is. Eeldatakse, et ekspluateerimine piirduks s\u00fcsteemi kokkuvarisemisega.    <\/ul>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58857\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044f\u0434\u0440\u0435 Linux \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b OverlayFS \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-0386), \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f root-\u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0430 FUS\u0415 \u0438 \u0440\u0430\u0437\u0440\u0435\u0448\u0435\u043d\u043e \u043c\u043e\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0430\u0437\u0434\u0435\u043b\u043e\u0432 OverlayFS \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 (\u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 Linux 5.11 \u0441 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 user namespace). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u0435\u0442\u043a\u0435 \u044f\u0434\u0440\u0430 6.2. \u041f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043c\u043e\u0436\u043d\u043e \u043f\u0440\u043e\u0441\u043b\u0435\u0434\u0438\u0442\u044c \u043d\u0430 [&hellip;]<\/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-107498","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u044f\u0434\u0440\u0435 Linux \u0432 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content=\"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 OverlayFS, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0412 \u044f\u0434\u0440\u0435 Linux \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b OverlayFS \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-0386), \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f root-\u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043d\u0430 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content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-03-24T10:48:20+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-03-24T18:21:30+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Haavatavus OverlayFS-is, mis v\u00f5imaldab privileegide t\u00f5stmist | ProHoster","description":"Linuxi tuumoris, OverlayFS failis\u00fcsteemi teostuses, on avastatud haavatavus (CVE-2023-0386), mida saab kasutada root-juurdep\u00e4\u00e4su saamiseks s\u00fcsteemides, kus on installitud FUSE alams\u00fcsteem ja kus on lubatud OverlayFS osade mountimine tavakasutajatelt (alates Linuxi tuumast 5.11 koos tavakasutaja nimede ruumide v\u00f5imaldamisega). Probleem on lahendatud tuuma haru 6.2. Pakettide uuenduste avaldamist jaotustes saab j\u00e4lgida","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-overlayfs-pozvolyayushhaya-povysit-svoi-privilegii","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","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 OverlayFS, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 | ProHoster","og:description":"\u0412 \u044f\u0434\u0440\u0435 Linux \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b OverlayFS \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-0386), \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f root-\u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0430 FUS\u0415 \u0438 \u0440\u0430\u0437\u0440\u0435\u0448\u0435\u043d\u043e \u043c\u043e\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0430\u0437\u0434\u0435\u043b\u043e\u0432 OverlayFS \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 (\u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 Linux 5.11 \u0441 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 user namespace). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u0435\u0442\u043a\u0435 \u044f\u0434\u0440\u0430 6.2. \u041f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043c\u043e\u0436\u043d\u043e \u043f\u0440\u043e\u0441\u043b\u0435\u0434\u0438\u0442\u044c \u043d\u0430","og:url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-overlayfs-pozvolyayushhaya-povysit-svoi-privilegii","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-03-24T10:48:20+00:00","article:modified_time":"2023-03-24T18:21:30+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/107498","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/comments?post=107498"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/107498\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/media?parent=107498"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/categories?post=107498"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/tags?post=107498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}