{"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\/cs\/blog\/news\/uyazvimost-v-utilite-smb4k-pozvolyayushhaya-poluchit-prava-root-v-sisteme","title":{"rendered":"Zranitelnost v utilit\u011b smb4k, kter\u00e1 umo\u017e\u0148uje z\u00edskat pr\u00e1va root v syst\u00e9mu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V utilit\u011b smb4k, pou\u017e\u00edvan\u00e9 v KDE k detekci a p\u0159ipojov\u00e1n\u00ed SMB odd\u00edl\u016f, byly zji\u0161t\u011bny zranitelnosti, kter\u00e9 umo\u017e\u0148uj\u00ed z\u00edskat root p\u0159\u00edstup k syst\u00e9mu. Probl\u00e9my byly odstran\u011bny ve vyd\u00e1n\u00ed Smb4K 4.0.5. Stav nov\u00e9 verze bal\u00ed\u010dku nebo p\u0159ipraven\u00e9 opravy lze zkontrolovat na n\u00e1sleduj\u00edc\u00edch str\u00e1nk\u00e1ch: Debian, Ubuntu, Fedora, SUSE\/openSUSE, Gentoo, Arch a FreeBSD. <\/p>\n

Pro prov\u00e1d\u011bn\u00ed privilegovan\u00fdch akc\u00ed v smb4k se pou\u017e\u00edvaj\u00ed KAuth zpracovatel\u00e9 spou\u0161t\u011bn\u00e9 s pr\u00e1vy root. Zranitelnosti jsou p\u0159\u00edtomny v zpracovateli Smb4KMountHelper a jsou zp\u016fsobeny t\u00edm, \u017ee funkce pro p\u0159ipojen\u00ed (CVE-2025-66003) a odpojen\u00ed (CVE-2025-66002) s\u00ed\u0165ov\u00e9ho souborov\u00e9ho syst\u00e9mu \u0159\u00e1dn\u011b nekontrolovaly mo\u017enosti p\u0159ed\u00e1van\u00e9 p\u0159\u00edkaz\u016fm mount.cifs a unmount.cifs, co\u017e umo\u017enilo nep\u0159id\u011blen\u00e9mu u\u017eivateli p\u0159edat t\u011bmto p\u0159\u00edkaz\u016fm libovoln\u00e9 volby p\u0159es parametr mh_options. <\/p>\n

Nap\u0159\u00edklad pomoc\u00ed mo\u017enost\u00ed «filemode=04777,uid=0» budou m\u00edt v\u0161echny soubory v p\u0159ipojen\u00e9 \u010d\u00e1sti nastaven vlajku suid root. U\u017eivatel m\u016f\u017ee spustit SMB server a p\u0159ipojit si vlastn\u00ed odd\u00edl s pot\u0159ebn\u00fdmi spustiteln\u00fdmi soubory, kter\u00e9 p\u0159i nastaven\u00ed mo\u017enost\u00ed «filemode=04777,uid=0» budou vykon\u00e1v\u00e1ny s pr\u00e1vy root. <\/p>\n

V zpracovateli Smb4KMountHelper tak\u00e9 nebyly \u0159\u00e1dn\u011b kontrolov\u00e1ny c\u00edlov\u00e9 adres\u00e1\u0159e, co\u017e nap\u0159\u00edklad umo\u017enilo p\u0159ipojit sv\u016fj SMB odd\u00edl m\u00edsto adres\u00e1\u0159e \/bin a vlo\u017eit do n\u011bj modifikovanou verzi \/bin\/bash. Krom\u011b toho je mo\u017en\u00e9 pomoc\u00ed parametru mh_krb5ticket zm\u011bnit cestu k souboru s p\u0159ihla\u0161ovac\u00edmi \u00fadaji Kerberos a dos\u00e1hnout v\u00fdpisu obsahu libovoln\u00e9ho souboru, nap\u0159\u00edklad \/etc\/shadow, na stderr nebo ve\u0159ejn\u011b dostupn\u00fd log. <\/p>\n

Zranitelnost ve funkci Smb4KMountHelper::unmount() m\u016f\u017ee b\u00fdt pou\u017eita k vyvol\u00e1n\u00ed doby nedostupnosti prost\u0159ednictv\u00edm odmontov\u00e1n\u00ed syst\u00e9mov\u00fdch odd\u00edl\u016f manipulac\u00ed s obsahem parametru mh_mountpoint. Zaj\u00edmav\u00e9 je, \u017ee v k\u00f3du byla kontrola typu odd\u00edlu, kter\u00e1 proch\u00e1zela pouze odd\u00edly cifs, smbfs a smb3, av\u0161ak v if-bloku pro v\u00fdstup chyby byl vynech\u00e1n p\u0159\u00edkaz «return» a prov\u00e1d\u011bn\u00ed nebylo p\u0159eru\u0161eno.
\n
Zdroj: 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\udd47Zranitelnost v utilit\u011b smb4k, kter\u00e1 umo\u017e\u0148uje z\u00edskat pr\u00e1va root v syst\u00e9mu | ProHoster","description":"V utilit\u011b smb4k, pou\u017e\u00edvan\u00e9 v KDE k detekci a p\u0159ipojov\u00e1n\u00ed SMB odd\u00edl\u016f, byly zji\u0161t\u011bny zranitelnosti, kter\u00e9 umo\u017e\u0148uj\u00ed z\u00edskat root p\u0159\u00edstup k syst\u00e9mu. 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