{"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\/novosti-interneta\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils","title":{"rendered":"Avalikustatud LPE-haavatavus CIFSwitch Linux CIFS\/cifs-utils-s.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Turvaspetsialist Asim Manizada<\/strong> paljastas haavatavuse CIFSwitch<\/strong> \u2014 lokaalne \u00f5iguste t\u00f5stmine Linuxi tuuma ja kasutaja paketiga cifs-utils<\/strong>. Probleem puudutab teed t\u00f6\u00f6tluses CIFS\/SMB Kerberos\/SPNEGO upcall<\/strong>, nimelt mehhanismi, mille kaudu Linuxi tuuma CIFS-klient k\u00fcsib kasutaja abivahendilt Kerberos autentimise andmete saamiseks SMB ressursside mountimise ajal. Kirjeldus on avaldatud p\u00e4rast linux-distros embargo l\u00f5ppemist; CVE identifikaator ei olnud avaldamise ajal veel m\u00e4\u00e4ratud.<\/p>\n

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Haavatavuse olemus on selles<\/a>, etten tavaline kasutaja sai kutsuda request_key("cifs.spnego", …) ja edastada vale v\u00f5tme kirjelduse. Normaalsetes tingimustes peaks sellise stringi koostama CIFS-i jaoks ette n\u00e4htud tuumaklient: selles sisalduvad andmed serveri, UID, krediidi UID, PID, \u00fclesande \u00fcleskutse ja muude parameetrite kohta. Siiski ei kontrollinud tuum, et kirjeldus p\u00e4rines t\u00f5epoolest CIFS-i alams\u00fcsteemist, ja cifs.upcall, mis k\u00e4ivitub root\u2019i \u00f5igustes standardse request-key reegli kaudu, usaldas neid v\u00e4lju andmete poolest, mis olid loodud tuuma poolt.<\/p>\n

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Haavatavus ei ole universaalne<\/a> \u00abaugust\u00bb igas Linuxis vaikimisi. Selleks, et see saaks eksisteerida, peavad t\u00e4ituma mitmed tingimused: haavatava tuuma olemasolu, installitud cifs-utils koos cifs.spnego reegliga, alandamatute kasutajate v\u00f5imalus luua user\/mount namespaces ning SELinuxi, AppArmori v\u00f5i muu LSM poliitika blokeerimise puudumine. OSS-security teates on eraldi m\u00e4rgitud, et haavatavates s\u00fcsteemides avab see tee alandatud kohalike kasutajate jaoks koodi t\u00e4itmiseks rootina.<\/p>\n

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Tehniliselt ahel ehitatakse selle \u00fcmber,<\/a>, et cifs.upcall saab minna nimede ruumidesse, mis on esitatud valekirjelduses, ja teha NSS-p\u00e4ringu enne privileegide l\u00f5plikku t\u00fchistamist. Selle tulemusena saab r\u00fcndaja kontrollitav keskkond m\u00f5jutada NSS-mooduli laadimist root-protsessi poolt. Avalikes kirjeldustes r\u00f5hutatakse, et see on t\u00f5epoolest loogiline viga tuuma ja kasutaja ruumi piiril, mitte klassikaline m\u00e4lu riknemise haavatavus.<\/p>\n

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Ytu tuum on v\u00e4ike: cifs.spnego v\u00f5tmete t\u00fc\u00fcpidele on lisatud kontroll, mis l\u00fckkab tagasi kirjeldused, mis on loodud mitte CIFS-i kliendi enda privaatsete spnego_cred'idena. See l\u00e4henemine lukustab r\u00fcnnakute klassi ilma vajalike s\u00fcnkroonsete muudatusteta cifs-utils'is, kuigi autor m\u00e4rgib, et t\u00e4iendav kasutajaruumi tugevdamine on siiski soovitatav.<\/p>\n

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AlmaLinux teatas<\/a>, et p\u00f5hiloogika on olemas k\u00f5igis toetatud AlmaLinux'i versioonides ning AlmaLinux 8, 9, 10 ja Kitten 10 loetakse m\u00f5jutatuks, kui cifs-utils on installitud. Parandatud kernlid on ette valmistatud testimurepositooriumides: AlmaLinux 9 puhul on m\u00e4rgitud pakett kernel-5.14.0-687.5.4.el9_8 v\u00f5i uuem, AlmaLinux 10 puhul \u2013 kernel-6.12.0-211.7.4.el10_2 v\u00f5i uuem.<\/p>\n

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Ajutiste meetmetena enne parandatud kernel'i installimist soovitatakse eemaldada cifs-utils, kui SMB\/CIFS-kliendi s\u00fcsteemis ei kasutata, keelata cifs'i moduli laadimine, override 'ida cifs.spnego reeglit request-key'is v\u00f5i keelata mitteprivilegeeritud kasutaja nimetamised. Need \u00fcmbersuunamismeetmed v\u00f5ivad rikkuda Kerberos autentimise CIFS-montaa\u017eide jaoks, seega tuleks neid rakendada ettevaatlikult serverites, kus tegelikult kasutatakse Kerberos-iga autentitud SMB-jaotusi.<\/p>\n

CIFSwitch on huvitav ka tuvastamisest r\u00e4\u00e4kides: autor kirjeldab seda kui tulemust mitmeastmeliste ahelate otsimisest, kasutades LLM-i ja graafip\u00f5hist esitamist turbeobjektide vahel. Kuid praktiline soovitus administraatoritele on pigem maandatud: kontrollida cifs-utils'i olemasolu, kasutaja nimede olekut ja tuuma uuendusi, eriti s\u00fcsteemides, kus on kohalikke kasutajaid v\u00f5i konteinerite stsenaariume laiendatud nimede v\u00f5imalustega.<\/p>\n

Allikas: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 […]<\/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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Avalikustatud LPE-haavatavus CIFSwitchis Linux CIFS\/cifs-utils | ProHoster","description":"Turvauurija Asim Manizada on avalikustanud CIFSwitchi haavatavuse \u2014 kohaliku privileegide t\u00f5stmise probleemi Linuxi tuuma ja kasutajakava cifs-utils vahel. Probleem puudutab CIFS\/SMB Kerberos\/SPNEGO upcall'i t\u00f6\u00f6tlemise teed, st mehhanismi, mille kaudu CIFS-i tuuma klient k\u00fcsib kasutajakava abist Kerberi autentimisandmete saamiseks SMB ressursside mountimise ajal. 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