{"id":38918,"date":"2019-10-31T22:26:45","date_gmt":"2019-10-31T19:26:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-sudo-pozvolyayushhaya-povysit-privilegii-pri-ispolzovanii-spetsifichnyh-pravil\/"},"modified":"2019-10-31T22:26:45","modified_gmt":"2019-10-31T19:26:45","slug":"uyazvimost-v-sudo-pozvolyayushhaya-povysit-privilegii-pri-ispolzovanii-spetsifichnyh-pravil","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-sudo-pozvolyayushhaya-povysit-privilegii-pri-ispolzovanii-spetsifichnyh-pravil","title":{"rendered":"Luka w sudo, umo\u017cliwiaj\u0105ca podniesienie uprawnie\u0144 przy u\u017cyciu specyficznych zasad","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W narz\u0119dziu Sudo<\/a><\/noindex>, u\u017cywanym do organizowania wykonywania polece\u0144 w imieniu innych u\u017cytkownik\u00f3w, wykryto<\/a><\/noindex> luka<\/a><\/noindex> (CVE-2019-14287<\/a><\/noindex>), kt\u00f3re pozwala na wykonywanie polece\u0144 z uprawnieniami root, gdy w ustawieniach sudoers znajduj\u0105 si\u0119 zasady, w kt\u00f3rych w sekcji sprawdzania identyfikatora u\u017cytkownika po zezwalaj\u0105cym s\u0142owie kluczowym \u201eALL\u201d znajduje si\u0119 wyra\u017any zakaz uruchamiania z uprawnieniami root (\u201e\u2026 (ALL, !root) \u2026\u201d). W domy\u015blnych konfiguracjach w dystrybucjach luka nie wyst\u0119puje. <\/p>\n

W przypadku, gdy w sudoers znajduj\u0105 si\u0119 dozwolone, ale niezwykle rzadko spotykane w praktyce zasady, zezwalaj\u0105ce na wykonywanie okre\u015blonego polecenia pod identyfikatorem UID dowolnego u\u017cytkownika, z wyj\u0105tkiem root, atakuj\u0105cy, posiadaj\u0105cy uprawnienia do wykonania tego polecenia, mo\u017ce omin\u0105\u0107 ustanowione ograniczenie i wykona\u0107 polecenie z uprawnieniami root. Aby obej\u015b\u0107 to ograniczenie, wystarczy spr\u00f3bowa\u0107 wykona\u0107 wskazane w ustawieniach polecenie z UID \u201e-1\u201d lub \u201e4294967295\u201d, co doprowadzi do jego wykonania z UID 0. <\/p>\n

Na przyk\u0142ad, je\u015bli w ustawieniach istnieje zasada, kt\u00f3ra daje dowolnemu u\u017cytkownikowi prawo do wykonywania programu \/usr\/bin\/id pod dowolnym UID:<\/p>\n

myhost ALL = (ALL, !root) \/usr\/bin\/id<\/p>\n

lub wariant, kt\u00f3ry zezwala na wykonanie tylko dla konkretnego u\u017cytkownika bob:<\/p>\n

myhost bob = (ALL, !root) \/usr\/bin\/id<\/p>\n

U\u017cytkownik mo\u017ce wykona\u0107 \u201esudo -u \u2018#-1\u2019 id\u201d i narz\u0119dzie \/usr\/bin\/id zostanie uruchomione z uprawnieniami root, mimo wyra\u017anego zakazu w ustawieniach. Problem wynika z pomini\u0119cia specjalnych warto\u015bci \u201e-1\u201d lub \u201e4294967295\u201d, kt\u00f3re nie prowadz\u0105 do zmiany UID, ale poniewa\u017c samo sudo ju\u017c dzia\u0142a jako root, to bez zmiany UID, tak\u017ce docelowe polecenie jest uruchamiane z uprawnieniami root. <\/p>\n

W dystrybucjach SUSE i openSUSE bez wskazania w zasadzie \u201eNOPASSWD\u201d luka nie jest wykorzystywana<\/a><\/noindex>, poniewa\u017c w sudoers domy\u015blnie w\u0142\u0105czony jest tryb \u201eDefaults targetpw\u201d, w kt\u00f3rym nast\u0119puje sprawdzanie UID w bazie hase\u0142 z wy\u015bwietleniem pro\u015bby o wprowadzenie has\u0142a docelowego u\u017cytkownika. W przypadku takich system\u00f3w atak mo\u017ce by\u0107 przeprowadzony tylko po spe\u0142nieniu warunk\u00f3w pojawiaj\u0105cych si\u0119 w zasady:<\/p>\n

myhost ALL = (ALL, !root) NOPASSWD: \/usr\/bin\/id<\/p>\n

Problem zosta\u0142 rozwi\u0105zany w wydaniu Sudo 1.8.28<\/a><\/noindex>. Poprawka jest r\u00f3wnie\u017c dost\u0119pna w formie \u0142atki<\/a><\/noindex>. W dystrybucjach luka zosta\u0142a ju\u017c usuni\u0119ta w Debian<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, Gentoo<\/a><\/noindex> i FreeBSD<\/a><\/noindex>. W momencie pisania tej wiadomo\u015bci problem pozostaje nierozwi\u0105zany w RHEL<\/a><\/noindex> i Fedora<\/a><\/noindex>. Luka zosta\u0142a wykryta przez badaczy bezpiecze\u0144stwa z firmy Apple.<\/p>\n

<\/a><\/noindex><\/p>\n

\u0179r\u00f3d\u0142o: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 Sudo, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0439 \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-2019-14287), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u043c\u0430\u043d\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root, \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u0432 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u0445 sudoers \u043f\u0440\u0430\u0432\u0438\u043b, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0432 \u0441\u0435\u043a\u0446\u0438\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043f\u043e\u0441\u043b\u0435 \u0440\u0430\u0437\u0440\u0435\u0448\u0430\u044e\u0449\u0435\u0433\u043e \u043a\u043b\u044e\u0447\u0435\u0432\u043e\u0433\u043e \u0441\u043b\u043e\u0432\u0430 «ALL» \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u044f\u0432\u043d\u044b\u0439 \u0437\u0430\u043f\u0440\u0435\u0442 \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root («… (ALL, !root) …»). \u0412 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044f\u0445 \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-38918","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\udd47Luka w sudo, kt\u00f3ra umo\u017cliwia podniesienie uprawnie\u0144 przy u\u017cyciu specyficznych regu\u0142 | ProHoster","description":"W narz\u0119dziu Sudo, u\u017cywanym do organizowania wykonywania polece\u0144 w imieniu innych u\u017cytkownik\u00f3w,","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-sudo-pozvolyayushhaya-povysit-privilegii-pri-ispolzovanii-spetsifichnyh-pravil","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 \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 sudo, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0445 \u043f\u0440\u0430\u0432\u0438\u043b | ProHoster","og:description":"\u0412 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 Sudo, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0439 \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 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