{"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\/sk\/blog\/news\/uyazvimost-v-sudo-pozvolyayushhaya-povysit-privilegii-pri-ispolzovanii-spetsifichnyh-pravil","title":{"rendered":"Zranite\u013enos\u0165 v sudo, ktor\u00e1 umo\u017e\u0148uje z\u00edska\u0165 zv\u00fd\u0161en\u00e9 pr\u00e1va pri vyu\u017e\u00edvan\u00ed \u0161pecifick\u00fdch pravidiel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V utilit\u011b Sudo<\/a><\/noindex>, pou\u017e\u00edvan\u00e9 na organizov\u00e1n\u00ed vykon\u00e1v\u00e1n\u00ed p\u0159\u00edkaz\u016f jm\u00e9nem jin\u00fdch u\u017eivatel\u016f, bola zisten\u00e1<\/a><\/noindex> zranite\u013enos\u0165<\/a><\/noindex> (CVE-2019-14287<\/a><\/noindex>), ktor\u00e1 umo\u017e\u0148uje vykon\u00e1vanie pr\u00edkazov s pr\u00e1vami root, za predpokladu, \u017ee v nastaveniach sudoers s\u00fa pravidl\u00e1, v ktor\u00fdch v sekcii kontroly identifik\u00e1tora pou\u017e\u00edvate\u013ea po povoluj\u00facom k\u013e\u00fa\u010dovom slove «ALL» nasleduje v\u00fdslovn\u00fd z\u00e1kaz spustenia s pr\u00e1vami root («… (ALL, !root) …»). V predvolenej konfigur\u00e1cii distrib\u00faci\u00ed sa zranite\u013enos\u0165 neprejavuje. <\/p>\n

Ak existuj\u00fa v sudoers povolen\u00e9, ale ve\u013emi zriedkavo sa v praxi vyskytuj\u00face pravidl\u00e1, ktor\u00e9 povo\u013euj\u00fa vykonanie ur\u010dit\u00e9ho pr\u00edkazu pod UID identifik\u00e1torom ak\u00e9hoko\u013evek pou\u017e\u00edvate\u013ea, okrem root, \u00fato\u010dn\u00edk, ktor\u00fd m\u00e1 opr\u00e1vnenia na vykonanie tohto pr\u00edkazu, m\u00f4\u017ee ob\u00eds\u0165 nastaven\u00e9 obmedzenie a vykona\u0165 pr\u00edkaz s pr\u00e1vami root. Na ob\u00eddenie obmedzenia sta\u010d\u00ed pok\u00fasi\u0165 sa vykona\u0165 uveden\u00fd pr\u00edkaz s UID «-1» alebo «4294967295», \u010do sp\u00f4sob\u00ed jeho vykonanie s UID 0. <\/p>\n

Nap\u0159\u00edklad, pokud v nastaven\u00ed existuje pravidlo, kter\u00e9 d\u00e1v\u00e1 ka\u017ed\u00e9mu u\u017eivateli pr\u00e1vo na vykon\u00e1n\u00ed programu \/usr\/bin\/id pod jak\u00fdmkoli UID:<\/p>\n

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

nebo varianta, kter\u00e1 povoluje vykon\u00e1n\u00ed pouze konkr\u00e9tn\u00edmu u\u017eivateli bob:<\/p>\n

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

Pou\u017e\u00edvate\u013e m\u00f4\u017ee vykona\u0165 «sudo -u ‘#-1’ id» a utilita \/usr\/bin\/id bude spusten\u00e1 s pr\u00e1vami root, napriek v\u00fdslovn\u00e9mu z\u00e1kazu v nastaveniach. Probl\u00e9m je sp\u00f4soben\u00fd prehliadnut\u00edm \u0161peci\u00e1lnych hodn\u00f4t «-1» alebo «4294967295», ktor\u00e9 nesp\u00f4sobuj\u00fa zmenu UID, ale ke\u010f\u017ee samotn\u00fd sudo u\u017e be\u017e\u00ed pod root, tak bez zmeny UID sa aj cie\u013eov\u00fd pr\u00edkaz sp\u00fa\u0161\u0165a s pr\u00e1vami root. <\/p>\n

V distrib\u00faci\u00e1ch SUSE a openSUSE bez uvedenia v pravidle «NOPASSWD» zranite\u013enos\u0165 nevyu\u017eiteln\u00e1<\/a><\/noindex>, ke\u010f\u017ee v sudoers je predvolene zapnut\u00fd re\u017eim «Defaults targetpw», pri ktorom sa vykon\u00e1va kontrola UID v datab\u00e1ze hesiel so zobrazen\u00edm v\u00fdzvy na zadanie hesla cie\u013eov\u00e9ho pou\u017e\u00edvate\u013ea. Pre podobn\u00e9 syst\u00e9my m\u00f4\u017ee by\u0165 \u00fatok vykonan\u00fd len za predpokladu, \u017ee s\u00fa pr\u00edtomn\u00e9 pravidl\u00e1 typu:<\/p>\n

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

Probl\u00e9m byl odstran\u011bn ve vyd\u00e1n\u00ed Sudo 1.8.28<\/a><\/noindex>. Oprava je tak\u00e9 dostupn\u00e1 ve form\u011b patchu<\/a><\/noindex>. V distribu\u010dn\u00edch syst\u00e9mech byla zranitelnost ji\u017e odstran\u011bna v Debian<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, Gentoo<\/a><\/noindex> a FreeBSD<\/a><\/noindex>. V dob\u011b psan\u00ed zpr\u00e1vy probl\u00e9m z\u016fst\u00e1v\u00e1 neopraven\u00fd v RHEL<\/a><\/noindex> a Fedora<\/a><\/noindex>. Zranitelnost byla zji\u0161t\u011bna bezpe\u010dnostn\u00edmi v\u00fdzkumn\u00edky z spole\u010dnosti Apple.<\/p>\n

<\/a><\/noindex><\/p>\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 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\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\udd47Zranite\u013enos\u0165 v sudo, ktor\u00e1 umo\u017e\u0148uje zv\u00fd\u0161i\u0165 privil\u00e9gia pri pou\u017e\u00edvan\u00ed \u0161pecifick\u00fdch pravidiel | ProHoster","description":"V utilit\u011b Sudo, pou\u017e\u00edvan\u00e9 pro organizaci vykon\u00e1v\u00e1n\u00ed p\u0159\u00edkaz\u016f jm\u00e9nem jin\u00fdch 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