{"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\/et\/blog\/news\/uyazvimost-v-cdnjs-pozvolivshaya-vypolnit-kod-na-serverah-cloudflare","title":{"rendered":"Turvaauk cdnjs, mis v\u00f5imaldas k\u00e4ivitada koodi Cloudflare'i serverites","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Cloudflare'i pakutud sisu edastamise v\u00f5rgus cdnjs, mis on m\u00f5eldud JavaScripti raamatukogude edastamise kiirus, tuvastati kriitiline haavatavus, mis v\u00f5imaldab t\u00e4ita mootorkoodi CDN-i serverites. Probleemi ohtlikkust suurendab see, et umbes 12,7% k\u00f5igist veebilehtedest kasutab seda JavaScripti raamatukogude laadimiseks ja infrastruktuuri kompromiteerimine v\u00f5imaldab asendada kogu nende lehtede edastatavat sisu. <\/p>\n

cdnjs teenus laadib pakette Git'ist v\u00f5i NPM-i hoidlast ning v\u00f5imaldab igal veebilehel tasuta kasutada Cloudflare'i sisuteenuse v\u00f5rgustikku, et kiirendada JavaScripti teekide laadimist. Anal\u00fc\u00fcsides GitHubis avaldatud cdnjs komponentide koodi, avastati, et NPM-pakettide v\u00e4ljav\u00f5tmiseks tgz-arhiividest kasutatakse sisseehitatud archive\/tar moodulit Go keeles, mis loetleb faile sellisena, nagu need on, ilma teede normaliseerimiseta. Kui skript v\u00e4ljav\u00f5tab sisu antud nimekirja p\u00f5hjal, v\u00f5ivad arhiivis olevad failid nagu \"..\\\/..\\\/..\\\/..\\\/..\\\/..\\\/..\\\/tmp\\\/test\" p\u00f5hjustada s\u00fcsteemis juhuslike failide \u00fclekirjutamist, s\u00f5ltuvalt ligip\u00e4\u00e4su\u00f5igustest. <\/p>\n

Eeldati, et r\u00fcndaja v\u00f5ib taotleda oma teegi lisamist cdnjs-i ja laadida NPM-i hoidlasse spetsiaalselt koostatud arhiivi, mis sisaldab teede failide nimedes s\u00fcmboleid \"..\\\/\". cdnjs serverites viiakse perioodiliselt l\u00e4bi \"autoupdate\" operatsioon, mille k\u00e4igus t\u00f6\u00f6tleja laadib alla uued versioonid pakutud teegist ja v\u00e4ljav\u00f5tab sisu. Failide abil, mille teed sisaldavad \"..\\\/\", v\u00f5ib r\u00fcndaja saavutada teenuse skriptifailide \u00fclekirjutamise ja oma koodi t\u00e4itmise. serveris<\/a> kuhu unpackimist tehti. <\/p>\n

Git-ist v\u00e4rskenduste laadimise korral selgus, et v\u00e4rskendusi laadiv t\u00f6\u00f6tleja ei arvestanud s\u00fcmboolseid linke faile Git-ist kopeerides. See omadus v\u00f5imaldas lugeda k\u00f5iki faile, serverid<\/a> lisades Git-i s\u00fcmboolseid linke. <\/p>\n

Eksperimendid cdnjs-i h\u00e4kkimise demonstreerimisega HackerOne'i auhinna saamiseks otsustati alustada h\u00fcpoteesi testimisega seoses failide lugemisega. Git-repositsioonis, mis jagab CDN-i kaudu JavaScripti teeki, lisati s\u00fcmboolne link test.js, mis osutas failile \/proc\/self\/maps. P\u00e4rast teegi uue versiooni avaldamist t\u00f6\u00f6tles v\u00e4rskenduste t\u00f6\u00f6tleja antud repositsiooni ja avaldas antud faili cdnjs-is (test.js loodi s\u00fcmboolse lingina ja faili p\u00e4rimise korral anti v\u00e4lja sisu \/proc\/self\/maps). <\/p>\n

Asendades s\u00fcmboolse lingi faili \/proc\/self\/environ, m\u00e4rkas uurija, et jagatud andmete seas on keskkonna muutuja GITHUB_REPO_API_KEY ja WORKERS_KV_API_TOKEN v\u00e4\u00e4rtused. Esimeses muutujaid hoiti API v\u00f5ti, et p\u00e4\u00e4seda kirjutamis\u00f5igusega repositsioonile robocdnjs GitHubis. Teises muutujaid hoiti KV-hoidla token cdnjs-is. Kasutades saadud teavet, suutis r\u00fcndaja teha muudatusi cdnjs-is ja t\u00e4ielikult kompromiteerida infrastruktuuri.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 […]<\/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\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\udd47Haavatavus cdnjs-is, mis v\u00f5imaldas koodi k\u00e4ivitada Cloudflare'i serverites | ProHoster","description":"Cloudflare'i pakutavas sisuhaldusteenuses cdnjs, mis on m\u00f5eldud JavaScripti teekide edastamise kiirus, tuvastati kriitiline haavatavus, mis v\u00f5imaldab serverites suvalist koodi 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