{"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\/sl\/blog\/news\/obnarodovana-lpe-uyazvimost-cifswitch-v-linux-cifs-cifs-utils","title":{"rendered":"\u041e\u0431\u044a\u044f\u0432\u043b\u0435\u043d\u0430 LPE-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CIFSwitch \u0432 Linux CIFS\/cifs-utils","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Obrtnik sigurnosti <strong>Asim Manizada<\/strong> otkrio ranjivost <strong>CIFSwitch<\/strong> \u2014 lokalno pove\u0107anje privilegija u kombinaciji s Linux jezgrom i korisni\u010dkim paketom <strong>cifs-utils<\/strong>. Problem se odnosi na put obrade <strong>CIFS\/SMB Kerberos\/SPNEGO upcall<\/strong>, odnosno mehanizam putem kojeg CIFS-klijent jezgre tra\u017ei od korisni\u010dkog helper-a podatke za Kerberos autentifikaciju prilikom montiranja SMB resursa. Opis je objavljen nakon isteka embarga linux-distros; identifikator CVE na trenutak objavljivanja jo\u0161 nije bio dodeljen.<\/p>\n<p><noindex><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/almalinux.org\/blog\/2026-05-28-cifswitch\/\">Su\u0161tina ranjivosti je u tome<\/a>, da je obi\u010dni uporabnik lahko poklical request_key(&quot;cifs.spnego&quot;, &#8230;) in posredoval ponarejen opis klju\u010da. V normalnem scenariju bi to vrstico moral oblikovati sam CIFS-odjemalec jedra: vsebuje informacije o stre\u017eniku, UID, credential UID, PID, ciljnem upcallu in drugih parametrih. Vendar jedro ni preverilo, ali je opis res pri\u0161el iz CIFS-podsystema, medtem ko je cifs.upcall, ki se izvaja kot root prek standardnega pravila request-key, zaupal tem poljem kot podatkom, ki jih je ustvarilo jedro.<\/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\">Ranjivost nije univerzalna<\/a> \u201erupa u svakom Linuxu iz kutije\u201c. Da bi se iskoristila, moraju se poklopiti nekoliko uslova: prisustvo ranjive jezgre, instalirani cifs-utils sa pravilom cifs.spnego, mogu\u0107nost za neprivilegovane korisnike da kreiraju user\/mount namespaces i odsustvo blokade od strane SELinux, AppArmor ili druge LSM politike. U poruci na oss-security posebno je nagla\u0161eno da u ranjivim sistemima ovo daje put od neprivilegovanog lokalnog korisnika do izvr\u0161avanja koda od roota.<\/p>\n<p><\/noindex><br \/>\n<noindex><\/p>\n<p>Tehni\u010dki <a rel=\"nofollow\" href=\"https:\/\/blog.cloudlinux.com\/cifswitch-mitigation-and-kernel-update\">lanac se gradi oko toga<\/a>, da cifs.upcall mo\u017ee pre\u0107i u imenske prostore navedene u la\u017enom opisu i izvr\u0161iti NSS upit do kona\u010dnog vra\u0107anja privilegija. Kao rezultat, okru\u017eenje pod kontrolom napada\u010da mo\u017ee uticati na u\u010ditavanje NSS modula od strane root procesa. U javnim opisima se nagla\u0161ava da je ovo zapravo logi\u010dka gre\u0161ka na granici jezgre i korisni\u010dkog prostora, a ne klasi\u010dna ranjivost korupcije memorije.<\/p>\n<p><\/noindex><\/p>\n<p>Ispravka u jezgri se pokazala kao mala: za tipove klju\u010deva cifs.spnego dodana je provera koja odbacuje opise koje nije sam CIFS-klijent kreirao sa svojim privatnim spnego_cred. Ovaj pristup zatvara klasu napada bez obaveznih sinhronizovanih promena u cifs-utils, iako autor napominje da je dodatno poja\u010danje korisni\u010dkog prostora i dalje po\u017eeljno.<\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/almalinux.org\/blog\/2026-05-28-cifswitch\/\">AlmaLinux je izvestila<\/a>, da je osnovna logika prisotna v vseh podprtih razli\u010dicah AlmaLinux, se \u0161teje, da so AlmaLinux 8, 9, 10 in Kitten 10 prizadeti, \u010de je name\u0161\u010den cifs-utils. Zakrpljena jedra so bila pripravljena v testing-repozitorijih: za AlmaLinux 9 je naveden paket kernel-5.14.0-687.5.4.el9_8 ali novej\u0161i, za AlmaLinux 10 \u2014 kernel-6.12.0-211.7.4.el10_2 ali novej\u0161i.<\/p>\n<p><\/noindex><\/p>\n<p>Kot za\u010dasne ukrepe pred namestitvijo popravljenega jedra se priporo\u010da odstranitev cifs-utils, \u010de SMB\/CIFS-odjemalec v sistemu ni v uporabi, prepoved nalaganja modula cifs, prepisovanje pravila cifs.spnego v request-key, ali onemogo\u010ditev neprivilegiranih uporabni\u0161kih namespacov. Ti obvozni ukrepi lahko uni\u010dijo Kerberos avtorizacijo za CIFS-monta\u017ee, zato je treba te ukrepe previdno uporabiti na stre\u017enikih, kjer so dejansko uporabljeni Kerberos-avtorizirani SMB-deli.<\/p>\n<p>CIFSwitch je zanimiv tudi v kontekstu odkrivanja: avtor jo opisuje kot rezultat iskanja ve\u010dstopenjskih verig z uporabo LLM in grafi\u010dne predstavitve povezav med objekti varnosti. Vendar je prakti\u010dni zaklju\u010dek za sisteme administracije precej prizemljen: preveriti prisotnost cifs-utils, stanje uporabni\u0161kih namespace-ov in posodobitve jedra, zlasti v sistemih, kjer so lokalni uporabniki ali skripte v kontejnerjih z raz\u0161irjenimi mo\u017enostmi namespace.<\/p>\n<p>Izvor: <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 5.0.4 - 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 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