{"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\/hu\/blog\/news\/uyazvimost-v-sudo-pozvolyayushhaya-povysit-privilegii-pri-ispolzovanii-spetsifichnyh-pravil","title":{"rendered":"A Sudo-ban tal\u00e1lt sebezhet\u0151s\u00e9g, amely lehet\u0151v\u00e9 teszi a privilegiz\u00e1lt jogosults\u00e1gok megszerz\u00e9s\u00e9t speci\u00e1lis szab\u00e1lyok alkalmaz\u00e1sakor.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A seg\u00e9dprogramban Sudo<\/a><\/noindex>, amelyet arra haszn\u00e1lnak, hogy m\u00e1s felhaszn\u00e1l\u00f3k nev\u00e9ben parancsokat hajtsanak v\u00e9gre, identified<\/a><\/noindex> vulnerability<\/a><\/noindex> (CVE-2019-14287<\/a><\/noindex>), amely lehet\u0151v\u00e9 teszi parancsok v\u00e9grehajt\u00e1s\u00e1t root jogokkal, amennyiben a sudoers be\u00e1ll\u00edt\u00e1sok k\u00f6z\u00f6tt a felhaszn\u00e1l\u00f3 azonos\u00edt\u00f3j\u00e1nak ellen\u0151rz\u00e9se ut\u00e1n az «ALL» enged\u0151 kulcssz\u00f3 ut\u00e1n kifejezett tilt\u00e1s szerepel a root jogok haszn\u00e1lat\u00e1ra («… (ALL, !root) …»). Az alap\u00e9rtelmezett konfigur\u00e1ci\u00f3kban a disztrib\u00faci\u00f3k nem mutatj\u00e1k a sebezhet\u0151s\u00e9get. <\/p>\n

Amennyiben a sudoers f\u00e1jlban megengedett, de a gyakorlatban rendk\u00edv\u00fcl ritk\u00e1n el\u0151fordul\u00f3 szab\u00e1lyok \u00e1llnak rendelkez\u00e9sre, amelyek megengedik egy adott parancs v\u00e9grehajt\u00e1s\u00e1t b\u00e1rmely felhaszn\u00e1l\u00f3 UID-azonos\u00edt\u00f3j\u00e1val, kiv\u00e9ve root, a t\u00e1mad\u00f3, aki jogosults\u00e1ggal rendelkezik e parancs v\u00e9grehajt\u00e1s\u00e1ra, megker\u00fclheti a be\u00e1ll\u00edtott korl\u00e1toz\u00e1st, \u00e9s v\u00e9grehajthatja a parancsot root jogokkal. A korl\u00e1toz\u00e1s megker\u00fcl\u00e9s\u00e9hez elegend\u0151 megpr\u00f3b\u00e1lni v\u00e9grehajtani a be\u00e1ll\u00edt\u00e1sokban megadott parancsot UID «-1» vagy «4294967295» \u00e9rt\u00e9kkel, ami a parancs UID 0-val t\u00f6rt\u00e9n\u0151 v\u00e9grehajt\u00e1s\u00e1t eredm\u00e9nyezi. <\/p>\n

P\u00e9ld\u00e1ul, ha a be\u00e1ll\u00edt\u00e1sok k\u00f6z\u00f6tt van egy szab\u00e1ly, amely b\u00e1rmely felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra enged\u00e9lyezi a program v\u00e9grehajt\u00e1s\u00e1t \\\/usr\\\/bin\\\/id b\u00e1rmely UID alatt:<\/p>\n

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

vagy egy v\u00e1ltozat, amely csak egy adott felhaszn\u00e1l\u00f3, bob sz\u00e1m\u00e1ra enged\u00e9lyezi a v\u00e9grehajt\u00e1st:<\/p>\n

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

A felhaszn\u00e1l\u00f3 v\u00e9grehajthatja a «sudo -u ‘#-1’ id» parancsot, \u00e9s a \/usr\/bin\/id eszk\u00f6z root jogokkal fog futni, annak ellen\u00e9re, hogy a be\u00e1ll\u00edt\u00e1sokban kifejezett tilt\u00e1s szerepel. A probl\u00e9ma a -1 vagy 4294967295 speci\u00e1lis \u00e9rt\u00e9kek figyelmen k\u00edv\u00fcl hagy\u00e1s\u00e1b\u00f3l ered, amelyek nem v\u00e1ltj\u00e1k ki az UID v\u00e1ltoz\u00e1s\u00e1t, de mivel mag\u00e1t a sud\u00f3t is root alatt hajtj\u00e1k v\u00e9gre, az UID v\u00e1ltoztat\u00e1sa n\u00e9lk\u00fcl a c\u00e9lparancs is root jogokkal indul. <\/p>\n

A SUSE \u00e9s openSUSE disztrib\u00faci\u00f3kban, ha a «NOPASSWD» szab\u00e1ly nincsen megadva, a sebezhet\u0151s\u00e9g nem kihaszn\u00e1lhat\u00f3<\/a><\/noindex>, mivel a sudoers f\u00e1jl alap\u00e9rtelmez\u00e9s szerint enged\u00e9lyezi a «Defaults targetpw» \u00fczemm\u00f3dot, amelyn\u00e9l az UID ellen\u0151rz\u00e9s t\u00f6rt\u00e9nik a jelsz\u00f3 adatb\u00e1zis alapj\u00e1n, amely a c\u00e9lfelhaszn\u00e1l\u00f3 jelszav\u00e1nak megad\u00e1s\u00e1t k\u00e9ri. Az ilyen rendszerek eset\u00e9ben a t\u00e1mad\u00e1s csak az al\u00e1bbi t\u00edpus\u00fa szab\u00e1lyok megl\u00e9te eset\u00e9n val\u00f3s\u00edthat\u00f3 meg:<\/p>\n

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

A probl\u00e9ma a k\u00f6vetkez\u0151 verzi\u00f3ban lett megsz\u00fcntetve Sudo 1.8.28<\/a><\/noindex>. A jav\u00edt\u00e1s szint\u00e9n el\u00e9rhet\u0151 form\u00e1ban patch form\u00e1j\u00e1ban<\/a><\/noindex>. A disztrib\u00faci\u00f3kban a sebezhet\u0151s\u00e9g m\u00e1r megsz\u00fcntet\u00e9sre ker\u00fclt a Debian<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, Gentoo<\/a><\/noindex> \u00e9s FreeBSD<\/a><\/noindex>. A h\u00edr \u00edr\u00e1sakor a probl\u00e9ma m\u00e9g nem volt jav\u00edtva a RHEL<\/a><\/noindex> \u00e9s Fedora<\/a><\/noindex>. A sebezhet\u0151s\u00e9get az Apple biztons\u00e1gi kutat\u00f3i fedezt\u00e9k fel.<\/p>\n

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

Forr\u00e1s: 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\udd47 A sudo-ban l\u00e9v\u0151 sebezhet\u0151s\u00e9g, amely lehet\u0151v\u00e9 teszi a privil\u00e9giumok emel\u00e9s\u00e9t speci\u00e1lis szab\u00e1lyok haszn\u00e1lat\u00e1val | ProHoster","description":"A Sudo seg\u00e9dprogramban, amelyet parancsok v\u00e9grehajt\u00e1s\u00e1ra haszn\u00e1lnak m\u00e1s felhaszn\u00e1l\u00f3k 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