{"id":151538,"date":"2025-12-14T11:11:58","date_gmt":"2025-12-14T09:11:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-utilite-smb4k-pozvolyayushhaya-poluchit-prava-root-v-sisteme"},"modified":"2025-12-14T11:11:58","modified_gmt":"2025-12-14T09:11:58","slug":"uyazvimost-v-utilite-smb4k-pozvolyayushhaya-poluchit-prava-root-v-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-utilite-smb4k-pozvolyayushhaya-poluchit-prava-root-v-sisteme","title":{"rendered":"Ranljivost u alatu smb4k koja omogu\u0107uje dobivanje root prava u sustavu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

U alatu smb4k, koji se koristi u KDE za otkrivanje i montiranje SMB dijelova, otkrivene su ranjivosti koje omogu\u0107uju pristup root-u sistema. Problemi su ispravljeni u izdanju Smb4K 4.0.5. Stanje nove verzije paketa ili pripreme ispravke mo\u017ee se provjeriti na sljede\u0107im stranicama: Debian, Ubuntu, Fedora, SUSE\/openSUSE, Gentoo, Arch i FreeBSD. <\/p>\n

Za izvo\u0111enje privilegiranih radnji unutar smb4k koriste se KAuth handleri, pokretani s root privilegijama. Ranjivosti su prisutne u handleru Smb4KMountHelper i uzrokovane su tim \u0161to funkcije za montiranje (CVE-2025-66003) i odmontiranje (CVE-2025-66002) mre\u017enog datote\u010dnog sustava nisu pravilno filtrirale opcije proslije\u0111ene mount.cifs i unmount.cifs naredbama, \u0161to je omogu\u0107ilo neprivilegiranom korisniku da proslijedi bilo koje opcije tim naredbama putem parametra mh_options. <\/p>\n

Na primjer, pomo\u0107u opcija «filemode=04777,uid=0» svi datoteke u montiranoj particiji dobit \u0107e oznaku suid root. Korisnik mo\u017ee pokrenuti SMB server i montirati svoju vlastitu particiju s potrebnim izvr\u0161nim datotekama, koje \u0107e se pri postavljanju opcija «filemode=04777,uid=0» izvr\u0161avati s pravima root. <\/p>\n

U handleru Smb4KMountHelper tako\u0111er se nije pravilno provjeravala ciljna direktorija, \u0161to je, primjerice, omogu\u0107ilo montiranje vlastitog SMB dijela umjesto direktorija \/bin i umetanje modifikovane verzije \/bin\/bash u njega. Osim toga, putem parametra mh_krb5ticket mo\u017ee se promijeniti put do datoteke s vjerodajnicama Kerberos i posti\u0107i ispis sadr\u017eaja bilo koje datoteke, na primjer, \/etc\/shadow, u stderr ili javno dostupni log. <\/p>\n

Ranljivost u funkciji Smb4KMountHelper::unmount() mo\u017ee se iskoristiti za izazivanje odustajanja usluge putem odmontiranja sistemskih particija, manipuliraju\u0107i sadr\u017eajem parametra mh_mountpoint. Zanimljivo je da je u kodu postojala provjera tipa particije koja je propu\u0161tala samo particije cifs, smbfs i smb3, ali je u if-bloku za ispis gre\u0161ke bio propu\u0161ten operator «return» te se izvr\u0161avanje nije prekinulo.
\n
Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 smb4k, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0439 \u0432 KDE \u0434\u043b\u044f \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0438 \u043c\u043e\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f SMB-\u0440\u0430\u0437\u0434\u0435\u043b\u043e\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 Smb4K 4.0.5. \u041f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 \u0438\u043b\u0438 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043a\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043c\u043e\u0436\u043d\u043e \u043d\u0430 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0445 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0430\u0445: Debian, Ubuntu, Fedora, SUSE\/openSUSE, Gentoo, Arch \u0438 FreeBSD. \u0414\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0439 \u0432 smb4k \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f KAuth-\u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438, \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u043c\u044b\u0435 […]<\/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-151538","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Ranjivost u alatu smb4k, koja omogu\u0107uje dobivanje root privilegija u sistemu | ProHoster","description":"U alatu smb4k, koji se koristi u KDE za otkrivanje i montiranje SMB dijelova, otkrivene su ranjivosti koje omogu\u0107uju pristup root-u sistema. Problemi su ispravljeni u izdanju Smb4K 4.0.5.","canonical_url":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-utilite-smb4k-pozvolyayushhaya-poluchit-prava-root-v-sisteme","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hr_HR","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 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 smb4k, \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 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 | ProHoster","og:description":"\u0412 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 smb4k, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0439 \u0432 KDE \u0434\u043b\u044f \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0438 \u043c\u043e\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f SMB-\u0440\u0430\u0437\u0434\u0435\u043b\u043e\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 Smb4K 4.0.5.","og:url":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-utilite-smb4k-pozvolyayushhaya-poluchit-prava-root-v-sisteme","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":"2025-12-14T09:11:58+00:00","article:modified_time":"2025-12-14T09:11:58+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"151538","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-01-23 16:35:19","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2026-01-23 16:35:19","updated":"2026-01-23 16:35:19","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/posts\/151538","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/comments?post=151538"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/posts\/151538\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/media?parent=151538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/categories?post=151538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/tags?post=151538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}