{"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\/sq\/blog\/news\/uyazvimost-v-cdnjs-pozvolivshaya-vypolnit-kod-na-serverah-cloudflare","title":{"rendered":"Dob\u00ebsi n\u00eb cdnjs q\u00eb lejoi ekzekutimin e kodit n\u00eb server\u00ebt e Cloudflare","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

N\u00eb rrjetin e shp\u00ebrndarjes s\u00eb p\u00ebrmbajtjes cdnjs, t\u00eb ofruar nga Cloudflare p\u00ebr p\u00ebrshpejtimin e shp\u00ebrndarjes s\u00eb bibliotekave JavaScript, \u00ebsht\u00eb zbuluar nj\u00eb dob\u00ebsi kritike q\u00eb lejon ekzekutimin e kodeve t\u00eb rast\u00ebsishme n\u00eb serverat CDN. Rreziku i problemit p\u00ebrkeq\u00ebsohet nga fakti se rreth 12.7% e t\u00eb gjitha faqeve n\u00eb internet p\u00ebrdorin sh\u00ebrbimin p\u00ebr t\u00eb ngarkuar bibliotekat JavaScript, dhe komprometimi i infrastruktur\u00ebs lejon z\u00ebvend\u00ebsimin e bibliotekave q\u00eb ofrohen nga cilido nga k\u00ebto faqe. <\/p>\n

Sh\u00ebrbimi cdnjs ngarkon paketat nga Git ose depoja NPM dhe i jep mund\u00ebsin\u00eb \u00e7do site t\u00eb p\u00ebrdor\u00eb falas rrjetin e shp\u00ebrndarjes s\u00eb p\u00ebrmbajtjes Cloudflare p\u00ebr t\u00eb p\u00ebrshpejtuar ngarkimin e bibliotekave JavaScript. Gjat\u00eb studimit t\u00eb kodit t\u00eb komponent\u00ebve cdnjs, t\u00eb publikuar n\u00eb GitHub, u zbulua se p\u00ebr t\u00eb zbuluar paketat NPM n\u00eb arkivat tgz p\u00ebrdoret moduli standard archive\/tar n\u00eb Go, i cili jep nj\u00eb list\u00eb skedar\u00ebsh ashtu si\u00e7 jan\u00eb, pa normalizimin e rrug\u00ebve. N\u00eb rastin kur skripti nxjerr p\u00ebrmbajtjen bazuar n\u00eb list\u00ebn e dh\u00ebn\u00eb, prania n\u00eb arkiv e skedar\u00ebve t\u00eb tipit \"..\\\/..\\\/..\\\/..\\\/..\\\/..\\\/tmp\\\/test\" mund t\u00eb \u00e7oj\u00eb n\u00eb shkrimin e skedar\u00ebve t\u00eb rast\u00ebsish\u00ebm n\u00eb sistem, p\u00ebr aq sa lejojn\u00eb t\u00eb drejtat e aksesit. <\/p>\n

U supozua se sulmuesi mund t\u00eb aplikoj\u00eb p\u00ebr t\u00eb shtuar bibliotek\u00ebn e tij n\u00eb cdnjs dhe t\u00eb ngarkoj\u00eb n\u00eb depo NPM nj\u00eb arkiv t\u00eb formatuar posa\u00e7\u00ebrisht, q\u00eb p\u00ebrmban skedar\u00eb me simbolet \"..\\\/\" n\u00eb rrug\u00eb. N\u00eb serverat cdnjs, her\u00eb pas here kryhet operacioni \"autoupdate\", gjat\u00eb t\u00eb cilit nj\u00eb trajtues ngarkon versione t\u00eb reja t\u00eb bibliotek\u00ebs s\u00eb propozuar dhe nxjerr p\u00ebrmbajtjen. Me ndihm\u00ebn e skedar\u00ebve me rrug\u00eb \"..\\\/\", sulmuesi mund t\u00eb arrij\u00eb shkrimin e skedar\u00ebve me skriptet e sh\u00ebrbimit dhe t\u00eb ekzekutoj\u00eb kodin e tij. server<\/a> n\u00eb t\u00eb cilin po kryhej nxjerrja. <\/p>\n

N\u00eb rastin e ngarkimit t\u00eb p\u00ebrdit\u00ebsimeve nga Git, u zbulua se procesori i ngarkimit t\u00eb p\u00ebrdit\u00ebsimeve nuk merrte parasysh lidhjet simbolike gjat\u00eb kopjimit t\u00eb skedar\u00ebve nga Git. Kjo ve\u00e7ori lejonte organizimin e leximit t\u00eb \u00e7do skedari me server\u00eb<\/a> p\u00ebrmes shtimit t\u00eb lidhjeve simbolike n\u00eb Git. <\/p>\n

Eksperimentet me demonstrimin e shkeljes s\u00eb cdnjs p\u00ebr t\u00eb fituar nj\u00eb shp\u00ebrblim n\u00eb HackerOne vendosi t\u00eb filloj\u00eb me verifikimin e hipotez\u00ebs n\u00eb lidhje me leximin e skedave. N\u00eb Git-repositorin e bibliotek\u00ebs JavaScript t\u00eb shp\u00ebrndar\u00eb p\u00ebrmes CDN, u shtua nj\u00eb lidhje simbolike test.js, e cila tregonte n\u00eb skedarin \/proc\/self\/maps. Pas publikimit t\u00eb nj\u00eb versioni t\u00eb ri t\u00eb bibliotek\u00ebs, p\u00ebrpunuesi i rinovimeve trajtoi k\u00ebt\u00eb repo dhe publikoi skedarin e caktuar n\u00eb cdnjs (test.js u krijua si lidhje simbolike dhe kur u k\u00ebrkua ky skedar, u jepeshin p\u00ebrmbajtjet e \/proc\/self\/maps). <\/p>\n

Duke z\u00ebvend\u00ebsuar lidhjen simbolike n\u00eb skedarin \/proc\/self\/environ, autori i studimit vuri re se brenda t\u00eb dh\u00ebnave t\u00eb d\u00ebrguara ishin vlerat e variablave t\u00eb ambientit GITHUB_REPO_API_KEY dhe WORKERS_KV_API_TOKEN. N\u00eb variablin e par\u00eb ishte ruajtur \u00e7el\u00ebsi p\u00ebr API p\u00ebr qasje me t\u00eb drejta shkruese n\u00eb repoin robocdnjs n\u00eb GitHub. N\u00eb variablin e dyt\u00eb ishte ruajtur tokeni p\u00ebr magazin\u00ebn KV n\u00eb cdnjs. Duke shfryt\u00ebzuar informacionet e marra, sulmuesi mund t\u00eb b\u00ebnte ndryshime n\u00eb cdnjs dhe ta komprometonte plot\u00ebsisht infrastruktur\u00ebn.
\n
Burimi: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\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 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