{"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\/de\/blog\/news\/uyazvimost-v-cdnjs-pozvolivshaya-vypolnit-kod-na-serverah-cloudflare","title":{"rendered":"Sicherheitsanf\u00e4lligkeit in cdnjs, die es erlaubte, Code auf den Servern von Cloudflare auszuf\u00fchren.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Im von Cloudflare bereitgestellten Content Delivery Network cdnjs, das zur Beschleunigung der Bereitstellung von JavaScript-Bibliotheken gedacht ist, wurde eine kritische Sicherheitsanf\u00e4lligkeit festgestellt, die die Ausf\u00fchrung beliebigen Codes auf den CDN-Servern erm\u00f6glicht. Die Gefahr des Problems wird dadurch verst\u00e4rkt, dass etwa 12,7 % aller Websites im Internet den Dienst zur Bereitstellung von JavaScript-Bibliotheken nutzen, und eine Kompromittierung der Infrastruktur k\u00f6nnte dazu f\u00fchren, dass die Bibliotheken, die von diesen Websites bereitgestellt werden, manipuliert werden.    <\/p>\n<p>\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 \u0438\u0437 Git \u0438\u043b\u0438 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f NPM, \u043f\u043e\u0441\u043b\u0435 \u0447\u0435\u0433\u043e \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043b\u044e\u0431\u043e\u043c\u0443 \u0441\u0430\u0439\u0442\u0443 \u0431\u0435\u0441\u043f\u043b\u0430\u0442\u043d\u043e \u0432\u043e\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0441\u0435\u0442\u044c\u044e \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 Cloudflare \u0434\u043b\u044f \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 JavaScript-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a. \u041f\u0440\u0438 \u0438\u0437\u0443\u0447\u0435\u043d\u0438\u0438 \u043a\u043e\u0434\u0430 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u043e\u0432 cdnjs, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 GitHub, \u0431\u044b\u043b\u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e, \u0447\u0442\u043e \u0434\u043b\u044f  \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u043a\u0438 NPM-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u0430\u0440\u0445\u0438\u0432\u0430\u0445 tgz \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0448\u0442\u0430\u0442\u043d\u044b\u0439 \u043c\u043e\u0434\u0443\u043b\u044c archive\/tar \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432\u044b\u0434\u0430\u0451\u0442 \u0441\u043f\u0438\u0441\u043e\u043a \u0444\u0430\u0439\u043b\u043e\u0432 \u043a\u0430\u043a \u0435\u0441\u0442\u044c, \u0431\u0435\u0437 \u043d\u043e\u0440\u043c\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0443\u0442\u0435\u0439.  \u0412 \u0441\u043b\u0443\u0447\u0430\u0435, \u043a\u043e\u0433\u0434\u0430 \u0441\u043a\u0440\u0438\u043f\u0442 \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u044b\u0432\u0430\u0435\u0442 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u0438 \u0432\u044b\u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0441\u043f\u0438\u0441\u043a\u0430, \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u0432 \u0430\u0440\u0445\u0438\u0432\u0435 \u0444\u0430\u0439\u043b\u043e\u0432 \u0432\u0438\u0434\u0430 &#171;..\/..\/..\/..\/..\/..\/..\/tmp\/test&#187; \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u044d\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043f\u0440\u0430\u0432\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u0430.        <\/p>\n<p>\u0411\u044b\u043b\u043e \u043f\u0440\u0435\u0434\u043f\u043e\u043b\u043e\u0436\u0435\u043d\u043e, \u0447\u0442\u043e \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0434\u0430\u0442\u044c \u0437\u0430\u044f\u0432\u043a\u0443 \u043d\u0430 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0441\u0432\u0435\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0432 cdnjs \u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u0438\u0442\u044c \u0432 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0439 NPM \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0439 \u0430\u0440\u0445\u0438\u0432, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0438\u0439 \u0444\u0430\u0439\u043b\u044b \u0441 \u0441\u0438\u043c\u0432\u043e\u043b\u0430\u043c\u0438  &#171;..\/&#187; \u0432 \u043f\u0443\u0442\u0438. \u041d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445 cdnjs \u043f\u0435\u0440\u0438\u043e\u0434\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f  &#171;autoupdate&#187;, \u0432 \u0445\u043e\u0434\u0435 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u0442 \u043d\u043e\u0432\u044b\u0435 \u0432\u0435\u0440\u0441\u0438\u0438 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0438 \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u044b\u0432\u0430\u0435\u0442 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435. \u041f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0444\u0430\u0439\u043b\u043e\u0432 c \u043f\u0443\u0442\u044f\u043c\u0438 &#171;..\/&#187; \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043c\u043e\u0436\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0444\u0430\u0439\u043b\u043e\u0432 \u0441\u043e \u0441\u043a\u0440\u0438\u043f\u0442\u0430\u043c\u0438 \u0441\u0435\u0440\u0432\u0438\u0441\u0430 \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/de\/server\/dts-dronten\/\"   title=\"Server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2643\">Server<\/a> dem das Entpacken stattfand.    <\/p>\n<p>Bei der Aktualisierung von Git wurde festgestellt, dass der aktualisierende Handler symbolische Links beim Kopieren von Dateien aus Git nicht ber\u00fccksichtigte. Diese Eigenschaft erlaubte es, das Lesen beliebiger Dateien von <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/de\/server\/dts-los-angeles\/\"   title=\"Server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3733\">Server<\/a> durch das Hinzuf\u00fcgen von symbolischen Links zu Git.     <\/p>\n<p>Experimente mit der Demonstration des Hacks der cdnjs zur Erlangung einer Belohnung auf HackerOne wurden mit der \u00dcberpr\u00fcfung einer Hypothese bez\u00fcglich des Lesens von Dateien begonnen. Ein symbolischer Link test.js, der auf die Datei \/proc\/self\/maps verweist, wurde im Git-Repository der \u00fcber CDN bereitgestellten JavaScript-Bibliothek hinzugef\u00fcgt. Nach der Ver\u00f6ffentlichung einer neuen Version behandelte der Aktualisierungsprozess dieses Repository und ver\u00f6ffentlichte die angegebene Datei in cdnjs (test.js wurde als symbolischer Link erstellt und lieferte beim Abrufen dieser Datei den Inhalt von \/proc\/self\/maps).    <\/p>\n<p>Indem er den symbolischen Link zur Datei \/proc\/self\/environ einf\u00fcgte, bemerkte der Forschungsautor, dass die zur\u00fcckgegebenen Daten die Werte der Umgebungsvariablen GITHUB_REPO_API_KEY und WORKERS_KV_API_TOKEN enthielten. In der ersten Variablen befand sich der API-Schl\u00fcssel f\u00fcr den schreibenden Zugriff auf das Repository robocdnjs auf GitHub. In der zweiten Variablen war das Token f\u00fcr das KV-Repository in cdnjs gespeichert. Mit diesen Informationen konnte der Angreifer \u00c4nderungen an cdnjs vornehmen und die gesamte Infrastruktur kompromittieren.<br \/>\n<br \/>Quelle: <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 5.0.1.1 - 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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