{"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\/it\/blog\/news\/uyazvimost-v-npm-pakete-pac-resolver-naschityvayushhem-3-mln-zagruzok-v-nedelyu","title":{"rendered":"Vulnerabilit\u00e0 nel pacchetto NPM pac-resolver, che conta 3 milioni di download a settimana","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nel pacchetto NPM pac-resolver, che conta oltre 3 milioni di download a settimana, \u00e8 stata identificata una vulnerabilit\u00e0 (CVE-2021-23406) che consente di eseguire codice JavaScript non autorizzato nel contesto dell'applicazione durante l'invio di richieste HTTP da progetti Node.js che supportano la funzione di autoconfigurazione del proxy. <\/p>\n

Il pacchetto pac-resolver analizza i file PAC, che includono uno script di autoconfigurazione del proxy. Un file PAC contiene codice JavaScript standard con la funzione FindProxyForURL, che definisce la logica per la scelta del proxy in base all'host e all'URL richiesto. La vulnerabilit\u00e0 consiste nel fatto che, per eseguire questo codice JavaScript in pac-resolver, veniva utilizzata un'API VM fornita da Node.js, che consente di eseguire codice JavaScript in un contesto diverso dal motore V8. <\/p>\n

Questa API \u00e8 esplicitamente contrassegnata nella documentazione come non destinata all'esecuzione di codice non fidato, poich\u00e9 non fornisce un'isolamento completo per il codice eseguito e consente di accedere al contesto originale. Il problema \u00e8 stato risolto nella versione pac-resolver 5.0.0, che \u00e8 stata aggiornata per utilizzare la libreria vm2, che offre un livello di isolamento superiore adatto all'esecuzione di codice non fidato.

\"Vulnerabilit\u00e0<\/center> <\/p>\n

Utilizzando una versione vulnerabile di pac-resolver, un attaccante pu\u00f2 ottenere l'esecuzione del proprio codice JavaScript nel contesto del codice del progetto che utilizza Node.js, se nel progetto sono incluse librerie che dipendono da pac-resolver. La libreria pi\u00f9 nota con questo problema \u00e8 Proxy-Agent, elencata tra le dipendenze di 360 progetti, inclusi urllib, aws-cdk, mailgun.js e firebase-tools, che insieme superano i tre milioni di download a settimana. <\/p>\n

Se un'applicazione che ha dipendenze da pac-resolver carica un file PAC fornito da un sistema che supporta il protocollo di autoconfigurazione del proxy WPAD, gli aggressori con accesso alla rete locale possono sfruttare la diffusione delle impostazioni proxy tramite DHCP per inserire file PAC dannosi.
\n
Fonte: opennet.ru<\/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 Vulnerabilit\u00e0 nel pacchetto NPM pac-resolver, che conta 3 milioni di download a settimana | ProHoster","description":"Nel pacchetto NPM pac-resolver, che conta oltre 3 milioni di download a settimana, \u00e8 stata identificata una vulnerabilit\u00e0 (CVE-2021-23406) che consente di eseguire codice JavaScript non autorizzato nel contesto dell'applicazione durante 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