{"id":100784,"date":"2021-07-17T22:22:35","date_gmt":"2021-07-17T20:22:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-cdnjs-pozvolivshaya-vypolnit-kod-na-serverah-cloudflare"},"modified":"2021-07-17T22:22:35","modified_gmt":"2021-07-17T20:22:35","slug":"uyazvimost-v-cdnjs-pozvolivshaya-vypolnit-kod-na-serverah-cloudflare","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-cdnjs-pozvolivshaya-vypolnit-kod-na-serverah-cloudflare","title":{"rendered":"Wra\u017cliwo\u015b\u0107 w cdnjs, kt\u00f3ra umo\u017cliwia wykonanie kodu na serwerach Cloudflare","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>W sieci dostarczania tre\u015bci cdnjs, oferowanej przez firm\u0119 Cloudflare w celu przyspieszenia dostarczania bibliotek JavaScript, zidentyfikowano krytyczn\u0105 luk\u0119, kt\u00f3ra umo\u017cliwia wykonanie dowolnego kodu na serwerach CDN. Niebezpiecze\u0144stwo problemu jest pot\u0119gowane przez fakt, \u017ce z tego serwisu korzysta oko\u0142o 12,7% wszystkich stron internetowych, a kompromitacja infrastruktury pozwala na podmienianie bibliotek dostarczanych przez dowoln\u0105 z tych stron.    <\/p>\n<p>Us\u0142uga cdnjs umo\u017cliwia pobieranie pakiet\u00f3w z Gita lub repozytorium NPM, a nast\u0119pnie daje ka\u017cdej stronie mo\u017cliwo\u015b\u0107 bezp\u0142atnego korzystania z sieci dostarczania tre\u015bci Cloudflare, aby przyspieszy\u0107 \u0142adowanie bibliotek JavaScript. Po analizie kodu komponent\u00f3w cdnjs opublikowanych na GitHubie wykryto, \u017ce do rozpakowywania pakiet\u00f3w NPM w archiwach tgz u\u017cywany jest standardowy modu\u0142 archive\/tar w j\u0119zyku Go, kt\u00f3ry przekazuje list\u0119 plik\u00f3w takimi, jakie s\u0105, bez normalizacji \u015bcie\u017cek. W przypadku, gdy skrypt rozpakowuje zawarto\u015b\u0107 na podstawie wydanej listy, obecno\u015b\u0107 w archiwum plik\u00f3w o nazwach typu \u201e..\/..\/..\/..\/tmp\/test\u201d mo\u017ce prowadzi\u0107 do nadpisania dowolnych plik\u00f3w w systemie, w zale\u017cno\u015bci od przydzielonych praw dost\u0119pu.        <\/p>\n<p>Za\u0142o\u017cono, \u017ce atakuj\u0105cy mo\u017ce z\u0142o\u017cy\u0107 wniosek o dodanie swojej biblioteki do cdnjs i przes\u0142a\u0107 do repozytorium NPM specjalnie sformatowane archiwum zawieraj\u0105ce pliki ze znakami \u201e..\/\u201d w \u015bcie\u017cce. Na serwerach cdnjs okresowo wykonywana jest operacja \u201eautoupdate\u201d, podczas kt\u00f3rej procesor pobiera nowe wersje proponowanej biblioteki i rozpakowuje zawarto\u015b\u0107. Dzi\u0119ki plikom ze \u015bcie\u017ckami \u201e..\/\u201d atakuj\u0105cy mo\u017ce doprowadzi\u0107 do nadpisania plik\u00f3w ze skryptami us\u0142ugi i wykonania swojego kodu na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/server\/dts-dronten\/\"   title=\"serwerze\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2643\">serwerze<\/a> kt\u00f3rym dokonano rozpakowywania.    <\/p>\n<p>W przypadku pobierania aktualizacji z Git stwierdzono, \u017ce obs\u0142uga pobieraj\u0105ca aktualizacje nie uwzgl\u0119dnia\u0142a dowi\u0105za\u0144 symbolicznych podczas kopiowania plik\u00f3w z Gita. Ta w\u0142a\u015bciwo\u015b\u0107 umo\u017cliwia\u0142a organizacj\u0119 odczytu jakichkolwiek plik\u00f3w z <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/server\/dts-los-angeles\/\"   title=\"serwery\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3733\">serwery<\/a> poprzez dodawanie dowi\u0105za\u0144 symbolicznych do Gita.     <\/p>\n<p>Eksperymenty z demonstracj\u0105 w\u0142amania do cdnjs w celu uzyskania nagrody na HackerOne rozpocz\u0119to od weryfikacji hipotezy dotycz\u0105cej odczytu plik\u00f3w. Do repozytorium Git biblioteki JavaScript przekazywanej przez CDN dodano symboliczne odwo\u0142anie test.js, wskazuj\u0105ce na plik \/proc\/self\/maps. Po publikacji nowej wersji biblioteki, mechanizm aktualizacji przetworzy\u0142 to repozytorium i opublikowa\u0142 wskazany plik w cdnjs (test.js zosta\u0142 utworzony jako symboliczne odwo\u0142anie i przy zapytaniu o ten plik zwraca\u0142 zawarto\u015b\u0107 \/proc\/self\/maps).    <\/p>\n<p>Podstawiaj\u0105c symboliczne odwo\u0142anie do pliku \/proc\/self\/environ, autor badania zauwa\u017cy\u0142, \u017ce w przekazanych danych znajduj\u0105 si\u0119 warto\u015bci zmiennych \u015brodowiskowych GITHUB_REPO_API_KEY i WORKERS_KV_API_TOKEN. W pierwszej zmiennej przechowywany by\u0142 klucz do API umo\u017cliwiaj\u0105cy zapis do repozytorium robocdnjs na GitHubie. W drugiej zmiennej przechowywany by\u0142 token do magazynu KV w cdnjs. Wykorzystuj\u0105c uzyskane informacje, przest\u0119pca m\u00f3g\u0142 wprowadzi\u0107 zmiany w cdnjs i ca\u0142kowicie skompromitowa\u0107 infrastruktur\u0119.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55499\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u0439 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Cloudflare \u0441\u0435\u0442\u0438 \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 cdnjs, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u043e\u0439 \u0434\u043b\u044f \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 JavaScript-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445 CDN. \u041e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0443\u0441\u0443\u0433\u0443\u0431\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043c, \u0447\u0442\u043e \u0434\u043b\u044f \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 JavaScript-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u043c \u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043e\u043a\u043e\u043b\u043e 12.7% \u0432\u0441\u0435\u0445 \u0441\u0430\u0439\u0442\u043e\u0432 \u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435 \u0438 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u044f \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438, \u043e\u0442\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u043b\u044e\u0431\u044b\u043c \u0438\u0437 \u044d\u0442\u0438\u0445 \u0441\u0430\u0439\u0442\u043e\u0432. \u0421\u0435\u0440\u0432\u0438\u0441 cdnjs \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u0442 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0443 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 [&hellip;]<\/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-100784","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u0439 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Cloudflare \u0441\u0435\u0442\u0438 \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 cdnjs, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u043e\u0439 \u0434\u043b\u044f \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f 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serwerach Cloudflare | ProHoster","description":"W oferowanej przez firm\u0119 Cloudflare sieci dostarczania tre\u015bci cdnjs, maj\u0105cej na celu przyspieszenie dostarczania bibliotek JavaScript, wykryto krytyczn\u0105 luk\u0119, kt\u00f3ra pozwala na wykonanie dowolnego kodu na serwerach.","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-cdnjs-pozvolivshaya-vypolnit-kod-na-serverah-cloudflare","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 cdnjs, 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