{"id":181796,"date":"2026-05-29T14:48:11","date_gmt":"2026-05-29T12:48:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/cifswitch-uyazvimost-v-cifs-podsisteme-yadra-linux-pozvolyayushhaya-poluchit-prava-root"},"modified":"2026-05-29T14:48:11","modified_gmt":"2026-05-29T12:48:11","slug":"cifswitch-uyazvimost-v-cifs-podsisteme-yadra-linux-pozvolyayushhaya-poluchit-prava-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/cifswitch-uyazvimost-v-cifs-podsisteme-yadra-linux-pozvolyayushhaya-poluchit-prava-root","title":{"rendered":"CIFSwitch &#8212; haavatavus Linuxi tuuma CIFS-alams\u00fcsteemis, mis v\u00f5imaldab saada root-\u00f5igusi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Avalikustatud on \u00fcksikasjad ja eksploiteerimise meetod CIFSwitch haavatavuse (CVE number pole veel m\u00e4\u00e4ratud) jaoks CIFS tuuma moodulis ja cifs-utils t\u00f6\u00f6riistakomplektis, mis v\u00f5imaldab ebap\u00e4deval kasutajal saada s\u00fcsteemis root \u00f5igusi. Parandus on saadaval ainult patch kujul, mis avaldati 16. mail ja 19. mail v\u00f5eti see Linuxi tuumate p\u00f5hivoolu. (korrektsioonide v\u00e4ljalaskmised veel ei ole saadaval). <\/p>\n<p>Haavatavus m\u00f5jutab koodi, mis toetab cifs.spnego mehhanismi SPNEGO (Simple and Protected GSSAPI Negotiation) protokolli autentimise jaoks SMB-serverite \u00fchendamisel. Kui cifs.spnego-d kasutatakse Kerberos\/SPNEGO v\u00f5tmete kindlaksm\u00e4\u00e4ramiseks, kutsub tuum esile cifs.upcall t\u00f6\u00f6tleja, mis on pakett cifs-utils poolt pakutud ja t\u00f6\u00f6tab kasutajaruumi \u00f5igustega root. <\/p>\n<p>Privileegimata kasutaja saab k\u00e4ivitada t\u00f6\u00f6tlejat, saates p\u00e4ringu, mis n\u00f5uab &#171;cifs.spnego&#187; v\u00f5tme saamist vale kirjeldus &#171;CIFS SPNEGO&#187; all. cifs.upcall t\u00f6\u00f6tlejas ei tehta t\u00e4iendavaid parameetrite kehtivuse kontrollimise samme, sealhulgas usaldusv\u00e4\u00e4rsetena tajutavaid v\u00e4\u00e4rtusi v\u00e4ljade pid, uid, creduid ja<br \/>\n  upcall_target. P\u00e4rast aktiveerimist l\u00e4heb CIFS.upcall t\u00f6\u00f6deldes kasutaja protsessi nimedesse, mille kaudu p\u00e4ring saadeti, ja enne privileegide t\u00fchistamist otsib s\u00fcsteemi NSS (Name Service Switch) andmebaasist.<\/p>\n<p>R\u00fcndaja v\u00f5ib k\u00e4ivitada oma protsessi eraldi mount-nimedes, mis viib NSS-i p\u00e4ringu teostamiseni tema kontekstis. Haavatavuse \u00e4rakasutamiseks on piisav, kui r\u00fcndaja loodud keskkonnas asub oma konfiguratsioonifail \/etc\/nsswitch.conf ja komplekti vale raamatukogud libnss_*.so.2. NSS-i p\u00e4ringu t\u00e4itmine CIFS.upcall t\u00f6\u00f6tleja poolt toob kaasa vale raamatukogude laadimise root-\u00f5igustega.<\/p>\n<p>Haavatavuse \u00e4rakasutamiseks peab s\u00fcsteem lubama kasutaja nimede (user namespace) v\u00f5i mounter-nimede (mount namespace) loomise, samuti peab s\u00fcsteemis olema installitud pakett cifs-utils. Jaotised, kus haavatavuse \u00e4rakasutamine on v\u00f5imalik vaikekonfiguratsioonis:<\/p>\n<ul>\n<li> Linux Mint Cinnamon 21.3\/22.3\n<li> CentOS Stream 9 GNOME\n<li> Rocky Linux 9 Workstation\n<li> Kali Linux\n<li> AlmaLinux 9.7 Workstation\n<li> SUSE 15 SP7\/SAP 15 SP7\/SAP 16\n<\/ul>\n<p>Jaotised, kus exploit'i t\u00f6\u00f6ks on vajalik cifs-utils paketi installimine: <\/p>\n<ul>\n<li> Ubuntu 18.04\/20.04\/22.04 Desktop\/Server\n<li> Pop!_OS 22.04 Intel\/24.04 Generic\n<li> Ubuntu 24.04 Desktop minimal\/full ja Server\n<li> Debian 11\/12\/13 netinst standard ja GNOME\/KDE\/standard\/XFCE\n<li> CentOS Stream 9 Cinnamon\/KDE\/MATE\/XFCE\n<li> Rocky Linux 9 KDE\/Workstation-Lite\n<li> openSUSE Leap 15.6 GNOME\/KDE\n<li> openSUSE Tumbleweed GNOME\/KDE\n<li> Rocky Linux 8 GenericCloud\n<li> Oracle Linux 8\/9 <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/vps\/abuzoustojchivye-vps\/\" title=\"KVM\" data-wpil-keyword-link=\"linked\">KVM<\/a>\n<li> Amazon Linux 2023 KVM\n<\/ul>\n<p>Jaotised, kus vaikimisi konfiguratsioonis rakendatakse seadistusi, mis blokeerivad haavatavuse ekspluateerimise l\u00e4bi SELinuxi v\u00f5i Apparmori, isegi kui cifs-utils pakett on olemas: <\/p>\n<ul>\n<li> Ubuntu 26.04 Desktop\/Server\n<li> Fedora 40\/41\/42\/43\/44 Workstation\/Server\n<li> CentOS Stream 10 GNOME\/KDE\n<li> Rocky Linux 10 Workstation\n<li> AlmaLinux 10.1 Workstation\n<li> Oracle Linux 10 KVM\n<li> openSUSE Tumbleweed GNOME\/KDE\n<li> openSUSE Leap 16.0 OEM GNOME\/KDE\/Minimal-VM\n<li> SUSE Linux 16\n<\/ul>\n<p>Kaitse \u00fcmberhiilimiseks v\u00f5ib blokeerida automaatse cifs mooduli laadimise:<\/p>\n<p>   sh -c &#171;printf &#8216;install cifs \/bin\/false&#092;n&#8217; &gt; \/etc\/modprobe.d\/cifs.conf; rmmod cifs 2&gt;\/dev\/null; true&#187;<\/p>\n<p>Samuti on v\u00f5imalik keelata user namespace kasutamine (&#171;sysctl -w kernel.unprivileged_userns_clone=0&#187;) ja eemaldada v\u00f5i \u00fcletada cifs-utils seadistustes cifs.spnego reegel:<\/p>\n<p>    cat &gt;\/etc\/request-key.d\/cifs.spnego.conf &lt;&#8216;EOF&#8217;<br \/>\n    create cifs.spnego * * \/usr\/sbin\/keyctl negate %k 30 %S<br \/>\n    EOF<\/p>\n<p>Sel ajal, 28. mail, avaldati 137 haavatavuse aruannet Linuxi kernelis ning 27. mail &#8212; 277 aruannet.<br \/>\n<br \/>Allikas: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65572\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0434\u0435\u0442\u0430\u043b\u0438 \u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CIFSwitch (CVE \u043f\u043e\u043a\u0430 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d) \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 \u044f\u0434\u0440\u0430 CIFS \u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 cifs-utils, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\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 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0438\u0434\u0435 \u043f\u0430\u0442\u0447\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d 16 \u043c\u0430\u044f \u0438 19 \u043c\u0430\u044f \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442 \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u0443\u044e \u0432\u0435\u0442\u043a\u0443 \u044f\u0434\u0440\u0430 Linux (\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u044f\u0434\u0440\u0430 \u0435\u0449\u0451 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043a\u043e\u0434, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-181796","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" 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CIFS-\u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0434\u0435\u0442\u0430\u043b\u0438 \u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CIFSwitch (CVE \u043f\u043e\u043a\u0430 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d) \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 \u044f\u0434\u0440\u0430 CIFS \u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 cifs-utils, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 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content=\"2026-05-29T12:48:11+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\udd47CIFSwitch \u2013 Linuxi s\u00fcdamiku CIFS-alams\u00fcsteemi haavatavus, mis v\u00f5imaldab saada root \u00f5igused | ProHoster","description":"Avalikustatud on CIFSwitch-i haavatavuse (CVE pole veel m\u00e4\u00e4ratud) \u00fcksikasjad ja selleks on v\u00e4lja t\u00f6\u00f6tatud eksploit, mis asub CIFSi s\u00fcdamiku moodulis ja cifs-utils t\u00f6\u00f6riistakomplektis. See v\u00f5imaldab privileegideta kasutajal saada root \u00f5igused s\u00fcsteemis. Parandus on saadaval ainult plaastri kujul, mis avaldati 16. mail ja 19. mail v\u00f5eti see Linuxi s\u00fcdamiku peavoolu. Haavatavus m\u00f5jutab koodi,","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/cifswitch-uyazvimost-v-cifs-podsisteme-yadra-linux-pozvolyayushhaya-poluchit-prava-root","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\udd47CIFSwitch \u2014 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 CIFS-\u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0434\u0435\u0442\u0430\u043b\u0438 \u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CIFSwitch (CVE \u043f\u043e\u043a\u0430 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d) \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 \u044f\u0434\u0440\u0430 CIFS \u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 cifs-utils, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\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 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0438\u0434\u0435 \u043f\u0430\u0442\u0447\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d 16 \u043c\u0430\u044f \u0438 19 \u043c\u0430\u044f \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442 \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u0443\u044e \u0432\u0435\u0442\u043a\u0443 \u044f\u0434\u0440\u0430 Linux (\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u044f\u0434\u0440\u0430 \u0435\u0449\u0451 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043a\u043e\u0434,","og:url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/cifswitch-uyazvimost-v-cifs-podsisteme-yadra-linux-pozvolyayushhaya-poluchit-prava-root","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":"2026-05-29T12:48:11+00:00","article:modified_time":"2026-05-29T12:48:11+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\/181796","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\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/comments?post=181796"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/181796\/revisions"}],"predecessor-version":[{"id":182094,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/181796\/revisions\/182094"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/media?parent=181796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/categories?post=181796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/tags?post=181796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}