{"id":101180,"date":"2021-09-02T22:22:53","date_gmt":"2021-09-02T20:22:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-npm-pakete-pac-resolver-naschityvayushhem-3-mln-zagruzok-v-nedelyu"},"modified":"2021-09-02T22:22:53","modified_gmt":"2021-09-02T20:22:54","slug":"uyazvimost-v-npm-pakete-pac-resolver-naschityvayushhem-3-mln-zagruzok-v-nedelyu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-npm-pakete-pac-resolver-naschityvayushhem-3-mln-zagruzok-v-nedelyu","title":{"rendered":"O vulnerabilitate \u00een pachetul NPM pac-resolver, care are 3 milioane de desc\u0103rc\u0103ri pe s\u0103pt\u0103m\u00e2n\u0103","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen pachetul NPM pac-resolver, care are peste 3 milioane de desc\u0103rc\u0103ri pe s\u0103pt\u0103m\u00e2n\u0103, a fost identificat\u0103 o vulnerabilitate (CVE-2021-23406) care permite execu\u021bia codului JavaScript propriu \u00een contextul aplica\u021biei atunci c\u00e2nd se trimit cereri HTTP din proiecte Node.js care suport\u0103 func\u021bia de auto-configurare a serverului proxy. <\/p>\n

Pachetul pac-resolver analizeaz\u0103 fi\u0219ierele PAC care includ un script pentru configurarea automat\u0103 a serverului proxy. Fi\u0219ierul PAC con\u021bine cod JavaScript obi\u0219nuit cu func\u021bia FindProxyForURL, care define\u0219te logica de selec\u021bie a proxy-ului \u00een func\u021bie de gazd\u0103 \u0219i URL-ul solicitat. Esen\u021ba vulnerabilit\u0103\u021bii este c\u0103 execu\u021bia acestui cod JavaScript \u00een pac-resolver utiliza API-ul VM din Node.js, permi\u021b\u00e2nd execu\u021bia codului JavaScript \u00eentr-un alt context al motorului V8. <\/p>\n

API-ul men\u021bionat este marcat \u00een mod clar \u00een documenta\u021bie ca nefiind destinat execu\u021biei codului nerecunoscut, deoarece nu ofer\u0103 o izolare complet\u0103 a codului executat \u0219i permite accesul la contextul ini\u021bial. Problema a fost rezolvat\u0103 \u00een versiunea pac-resolver 5.0.0, care a fost actualizat\u0103 pentru a folosi biblioteca vm2, oferind un nivel mai ridicat de izolare, potrivit pentru execu\u021bia codului nerecunoscut.

\"O<\/center> <\/p>\n

C\u00e2nd se folose\u0219te versiunea vulnerabil\u0103 a pac-resolver, un atacator poate, prin trimiterea unui fi\u0219ier PAC special conceput, s\u0103 ob\u021bin\u0103 execu\u021bia propriului cod JavaScript \u00een contextul codului proiectului care utilizeaz\u0103 Node.js, dac\u0103 \u00een acest proiect sunt utilizate biblioteci care depind de pac-resolver. Cea mai popular\u0103 dintre bibliotecile afectate este Proxy-Agent, care apare \u00een dependen\u021bele a 360 de proiecte, inclusiv urllib, aws-cdk, mailgun.js \u0219i firebase-tools, cu un total de peste trei milioane de desc\u0103rc\u0103ri pe s\u0103pt\u0103m\u00e2n\u0103. <\/p>\n

Dac\u0103 aplica\u021bia care are dependen\u021be de pac-resolver \u00eencarc\u0103 un fi\u0219ier PAC furnizat de un sistem care suport\u0103 protocolul de auto-configurare a proxy-ului WPAD, atacatorii cu acces la re\u021beaua local\u0103 pot profita de propagarea set\u0103rilor proxy prin DHCP pentru a introduce fi\u0219iere PAC mali\u021bioase.
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 NPM-\u043f\u0430\u043a\u0435\u0442\u0435 pac-resolver, \u043d\u0430\u0441\u0447\u0438\u0442\u044b\u0432\u0430\u044e\u0449\u0435\u043c \u0431\u043e\u043b\u0435\u0435 3 \u043c\u043b\u043d \u0437\u0430\u0433\u0440\u0443\u0437\u043e\u043a \u0432 \u043d\u0435\u0434\u0435\u043b\u044e, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-23406), \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 \u0441\u0432\u043e\u0435\u0433\u043e JavaScript-\u043a\u043e\u0434\u0430 \u0432 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u043f\u0440\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0435 HTTP-\u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0438\u0437 Node.js-\u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u044e \u0430\u0432\u0442\u043e\u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438 \u043f\u0440\u043e\u043a\u0441\u0438-\u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u041f\u0430\u043a\u0435\u0442 pac-resolver \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u0442 \u0440\u0430\u0437\u0431\u043e\u0440 PAC-\u0444\u0430\u0439\u043b\u043e\u0432, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0438\u0445 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0439 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438 \u043f\u0440\u043e\u043a\u0441\u0438-\u0441\u0435\u0440\u0432\u0435\u0440\u0430. PAC-\u0444\u0430\u0439\u043b \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u043e\u0431\u044b\u0447\u043d\u044b\u0439 JavaScript-\u043a\u043e\u0434 \u0441 \u0444\u0443\u043d\u043a\u0446\u0438\u0435\u0439 FindProxyForURL, \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u044e\u0449\u0435\u0439 \u043b\u043e\u0433\u0438\u043a\u0443 \u0432\u044b\u0431\u043e\u0440\u0430 \u043f\u0440\u043e\u043a\u0441\u0438 \u0432 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":101181,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-101180","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47 Vulnerabilitate \u00een pachetul NPM pac-resolver, cu 3 milioane de desc\u0103rc\u0103ri pe s\u0103pt\u0103m\u00e2n\u0103 | ProHoster","description":"\u00cen pachetul NPM pac-resolver, care are peste 3 milioane de desc\u0103rc\u0103ri pe s\u0103pt\u0103m\u00e2n\u0103, a fost identificat\u0103 o vulnerabilitate (CVE-2021-23406) care permite execu\u021bia codului propriu JavaScript \u00een contextul 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