{"id":181809,"date":"2026-05-30T14:48:10","date_gmt":"2026-05-30T12:48:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils"},"modified":"2026-05-30T14:48:10","modified_gmt":"2026-05-30T12:48:10","slug":"obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils","title":{"rendered":"Avalikustatud LPE-haavatavus CIFSwitch Linux CIFS\/cifs-utilsis","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Turvauuringute spetsialist <strong>Asim Manizada<\/strong> avastas haavatavuse <strong>CIFSwitch<\/strong> \u2014 kohalik t\u00f5us \u00f5igustes Linuxi ydre ja kasutaja paketi vahel <strong>cifs-utils<\/strong>. Probleem puudutab t\u00f6\u00f6tlemisteed <strong>CIFS\/SMB Kerberos\/SPNEGO upcall<\/strong>, ehk mehhanismi, mille kaudu CIFS-i ydre k\u00fcsib kasutaja helper'ilt Kerberos autentimise andmeid SMB ressursside mountimise ajal. Kirjeldus avaldati p\u00e4rast linux-distros embargo l\u00f5ppu; avaldamise ajal ei olnud CVE identifikaator veel m\u00e4\u00e4ratud.<\/p>\n<p><noindex><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/almalinux.org\/blog\/2026-05-28-cifswitch\/\">Haavatavuse tuum seisneb selles<\/a>, et praktiline kasutaja suutis kutsuda request_key(&quot;cifs.spnego&quot;, &#8230;) ja edastada vale v\u00f5tmekirjelduse. Normaalses stsenaariumis peaks sarnase rea koostama CIFS-i kerneliklient, kuna see sisaldab teavet serveri, UID, credential UID, PID, upcall'i sihtm\u00e4rgi ja muude parameetrite kohta. Kuid kernel ei kontrollinud, et kirjeldus p\u00e4rines t\u00f5eliselt CIFS-i alams\u00fcsteemist, ning cifs.upcall, mis k\u00e4ivitati root'i kaudu standardse request-key reegli abil, usaldas neid alasid kui kerneli genereeritud andmeid.<\/p>\n<p><\/noindex><\/noindex><\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2026\/05\/28\/2\">Haavatavus ei ole universaalne<\/a> \u201eauk igas Linuxi s\u00fcsteemis\u201c. Selle \u00e4ra kasutamiseks peavad olema olemas mitmed tingimused: haavatava ydre olemasolu, installitud cifs-utils koos cifs.spnego reegliga, v\u00f5imalus mitteprivilegeeritud kasutajatel luua user\/mount namespaces, samuti SELinux, AppArmor v\u00f5i muu LSM poliitika puudumine. Oss-security s\u00f5numis on eraldi mainitud, et haavatavates s\u00fcsteemides avab see tee mitteprivilegeeritud kohalikule kasutajale root'i \u00f5igustega koodi t\u00e4itmise.<\/p>\n<p><\/noindex><br \/>\n<noindex><\/p>\n<p>Tehniliselt <a rel=\"nofollow\" href=\"https:\/\/blog.cloudlinux.com\/cifswitch-mitigation-and-kernel-update\">ehitatakse ahel \u00fcmber selle<\/a>, et cifs.upcall v\u00f5ib liikuda vale kirjelduse korral tehtud nimedesse ja t\u00e4ita NSS-p\u00e4ringu enne privileegide t\u00e4ielikku tagastamist. Selle tulemusena v\u00f5ib r\u00fcndaja kontrollitud keskkond m\u00f5jutada NSS mooduli laadimist root-protsessi poolt. Avalikes kirjeldustes r\u00f5hutatakse, et see on t\u00f5epoolest loogiline viga ydre ja kasutaja ruumi piiril, mitte klassikaline m\u00e4lu rikkumise haavatavus.<\/p>\n<p><\/noindex><\/p>\n<p>Ydre parandamine osutus mahult v\u00e4ikseks: cifs.spnego v\u00f5tmet\u00fc\u00fcpide jaoks lisati kontroll, mis k\u00f5rvaldab kirjeldused, mis ei olnud loodud CIFS-i ydre enda privaatsete spnego_cred'i poolt. Selline l\u00e4henemine sulgeb r\u00fcnnakute klassi ilma cifs-utils'i kohustuslike s\u00fcnkroonsete muudatusteta, kuigi autor r\u00f5hutab, et t\u00e4iendav user space'i tugevdamine on endiselt soovitatav.<\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/almalinux.org\/blog\/2026-05-28-cifswitch\/\">AlmaLinux teatas<\/a>, et aluse loogika on saadaval k\u00f5igis toetatavates AlmaLinuxi v\u00e4ljaannetes, samas kui AlmaLinux 8, 9, 10 ja Kitten 10 peetakse m\u00f5jutatuks, kui cifs-utils on installitud. Pat\u0161eeritud kernlid on ette valmistatud testimisrepoos: AlmaLinux 9 jaoks on n\u00e4idatud pakett kernel-5.14.0-687.5.4.el9_8 v\u00f5i uuem, AlmaLinux 10 jaoks \u2014 kernel-6.12.0-211.7.4.el10_2 v\u00f5i uuem.<\/p>\n<p><\/noindex><\/p>\n<p>Ajutiste meetmetena enne parandatud kernli installimist soovitatakse eemaldada cifs-utils, kui SMB\/CIFS-klienti s\u00fcsteemis ei kasutata, keelata cifs mooduli laadimine, muuta cifs.spnego reeglit request-key-s v\u00f5i keelata privileegita kasutaja nimeta. Need ringi hiilimismeetmed v\u00f5ivad rikkuda Kerberose autentimise CIFS-monteeringutele, seega tuleks nende rakendamist ettevaatlikult k\u00e4sitleda serverites, kus t\u00f5eliselt kasutatakse Kerberos-autoriseeritud SMB-jagat.<\/p>\n<p>CIFSwitch on huvitav ka avastamise konteksti t\u00f5ttu: autor kirjeldab seda kui tulemust, mis tuleneb mitmeastmeliste ahelate otsimisest LLM-i ja objekti turvaelementide sidemete graafilise esitluse abil. Kuid praktiline j\u00e4reldus administraatoritele on \u00fcsna maine: kontrollida cifs-utils olemasolu, kasutaja nimeta staatust ja kernli v\u00e4rskendusi, eriti s\u00fcsteemides, kus on kohalikke kasutajaid v\u00f5i konteineritooted koos laiendatud nimeta v\u00f5imalustega.<\/p>\n<p>Allikas: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/security\/18305995\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 Asim Manizada \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u2014 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u0441\u0432\u044f\u0437\u043a\u0435 \u044f\u0434\u0440\u0430 Linux \u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 cifs-utils. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043f\u0443\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 CIFS\/SMB Kerberos\/SPNEGO upcall, \u0442\u043e \u0435\u0441\u0442\u044c \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c, \u0447\u0435\u0440\u0435\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0439 CIFS-\u043a\u043b\u0438\u0435\u043d\u0442 \u044f\u0434\u0440\u0430 \u0437\u0430\u043f\u0440\u0430\u0448\u0438\u0432\u0430\u0435\u0442 \u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e helper\u2019\u0430 \u0434\u0430\u043d\u043d\u044b\u0435 \u0434\u043b\u044f Kerberos-\u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u043f\u0440\u0438 \u043c\u043e\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 SMB-\u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432. \u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043e \u043f\u043e\u0441\u043b\u0435 \u0438\u0441\u0442\u0435\u0447\u0435\u043d\u0438\u044f \u044d\u043c\u0431\u0430\u0440\u0433\u043e linux-distros; \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 CVE \u043d\u0430 \u043c\u043e\u043c\u0435\u043d\u0442 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0435\u0449\u0451 [&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-181809","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 Asim Manizada \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u2014 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u0441\u0432\u044f\u0437\u043a\u0435 \u044f\u0434\u0440\u0430 Linux \u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 cifs-utils.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Erik Peterson\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/et\/blog\/news\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"et_EE\" \/>\n\t\t<meta property=\"og:site_name\" content=\"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\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u041e\u0431\u043d\u0430\u0440\u043e\u0434\u043e\u0432\u0430\u043d\u0430 LPE-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u0432 Linux CIFS\/cifs-utils | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 Asim Manizada \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u2014 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u0441\u0432\u044f\u0437\u043a\u0435 \u044f\u0434\u0440\u0430 Linux \u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 cifs-utils.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/et\/blog\/news\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-05-30T12:48:10+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-05-30T12:48:10+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\udd47Avalikustatud LPE-haavatavus CIFSwitch Linux CIFS\/cifs-utils | ProHoster","description":"Julgeolekuuurija Asim Manizada paljastas CIFSwitchi haavatavuse \u2014 lokaalne privileegide t\u00f5stmine Linuxi kernli ja cifs-utils kasutaja paketi vahel.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/news\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils","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\u041e\u0431\u043d\u0430\u0440\u043e\u0434\u043e\u0432\u0430\u043d\u0430 LPE-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u0432 Linux CIFS\/cifs-utils | ProHoster","og:description":"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 Asim Manizada \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u2014 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u0441\u0432\u044f\u0437\u043a\u0435 \u044f\u0434\u0440\u0430 Linux \u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 cifs-utils.","og:url":"https:\/\/prohoster.info\/et\/blog\/news\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils","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":"2026-05-30T12:48:10+00:00","article:modified_time":"2026-05-30T12:48:10+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\/181809","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=181809"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/181809\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/media?parent=181809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/categories?post=181809"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/tags?post=181809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}