{"id":99604,"date":"2021-03-29T10:22:51","date_gmt":"2021-03-29T08:22:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah"},"modified":"2021-03-29T10:22:51","modified_gmt":"2021-03-29T08:22:51","slug":"uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah","title":{"rendered":"Vulnerabilit\u00e0 nel pacchetto NPM node-netmask, utilizzato in 270.000 progetti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nel pacchetto NPM node-netmask, che conta circa 3 milioni di download a settimana e viene utilizzato come dipendenza in oltre 270.000 progetti su GitHub, \u00e8 stata identificata una vulnerabilit\u00e0 (CVE-2021-28918) che consente di eludere i controlli in cui la maschera di rete \u00e8 utilizzata per determinare l'inclusione in intervalli di indirizzi o per il filtraggio. Il problema \u00e8 stato risolto nella versione 2.0.0 di node-netmask. <\/p>\n

La vulnerabilit\u00e0 consente di trattare un indirizzo IP esterno come se fosse un indirizzo di rete interna e viceversa, e in base a una certa logica di utilizzo del modulo node-netmask all'interno dell'applicazione si possono effettuare attacchi SSRF (Server-side request forgery), RFI (Remote File Inclusion) e LFI (Local File Inclusion) per accedere a risorse nella rete interna e includere nell'esecuzione file esterni o locali. Il problema risiede nel fatto che, secondo la specifica, i valori degli indirizzi che iniziano con zero devono essere interpretati come numeri ottali, ma il modulo \u00abnode-netmask\u00bb non considera questa particolarit\u00e0 e li gestisce come numeri decimali. <\/p>\n

Ad esempio, un attaccante potrebbe richiedere una risorsa locale specificando il valore \u00ab0177.0.0.1\u00bb, che corrisponde a \u00ab127.0.0.1\u00bb, ma il modulo \u00abnode-netmask\u00bb ignorer\u00e0 lo zero e tratter\u00e0 \u00ab0177.0.0.1\u00bb come \u00ab177.0.0.1\u00bb, il che in fase di valutazione delle regole di accesso non permetter\u00e0 di determinare che \u00e8 identico a \u00ab127.0.0.1\u00bb. Allo stesso modo, l'attaccante pu\u00f2 specificare l'indirizzo \u00ab0127.0.0.1\u00bb, che dovrebbe essere identificato come \u00ab127.0.0.1\u00bb, ma nel modulo \u00abnode-netmask\u00bb sar\u00e0 elaborato come \u00ab127.0.0.1\u00bb. Analogamente, \u00e8 possibile ingannare i controlli relativi agli indirizzi intranet specificando valori come \u00ab012.0.0.1\u00bb (equivalente a \u00ab10.0.0.1\u00bb, ma verificato come \u00ab12.0.0.1\u00bb). <\/p>\n

I ricercatori che hanno identificato il problema lo definiscono catastrofico e menzionano diversi scenari di attacco, ma la maggior parte di essi appare teorica. Ad esempio, si parla della possibilit\u00e0 di attaccare un'applicazione basata su Node.js che stabilisce connessioni esterne per richiedere risorse basate su parametri o dati della richiesta in ingresso, ma l'applicazione specifica non viene menzionata n\u00e9 dettagliata. Anche se si trovassero applicazioni che effettuano il caricamento di risorse basate su input forniti IP addresses<\/a>, non \u00e8 del tutto chiaro come sia possibile applicare la vulnerabilit\u00e0 nella pratica senza connettersi a una rete locale o senza ottenere il controllo sugli indirizzi IP \"speculari\". <\/p>\n

I ricercatori suppongono solamente che i proprietari di 87.0.0.1 (Telecom Italia) e 0177.0.0.1 (Brasil Telecom) possano bypassare le restrizioni di accesso a 127.0.0.1. Uno scenario pi\u00f9 realistico sarebbe utilizzare la vulnerabilit\u00e0 per aggirare vari elenchi di blocco implementati dal lato dell'applicazione. Il problema pu\u00f2 anche essere utilizzato per scambiare la definizione degli intervalli intranet nel modulo NPM \u00abprivate-ip\u00bb.
\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 node-netmask, \u043d\u0430\u0441\u0447\u0438\u0442\u044b\u0432\u0430\u044e\u0449\u0435\u043c \u043e\u043a\u043e\u043b\u043e 3 \u043c\u043b\u043d \u0437\u0430\u0433\u0440\u0443\u0437\u043e\u043a \u0432 \u043d\u0435\u0434\u0435\u043b\u044e \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u043c \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u0443 \u0431\u043e\u043b\u0435\u0435 270 \u0442\u044b\u0441\u044f\u0447 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432 \u043d\u0430 GitHub, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-28918), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u0430\u044f \u043c\u0430\u0441\u043a\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0432\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0432 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d\u044b \u0430\u0434\u0440\u0435\u0441\u043e\u0432 \u0438\u043b\u0438 \u0434\u043b\u044f \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 node-netmask 2.0.0. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e IP-\u0430\u0434\u0440\u0435\u0441\u0430 \u043a\u0430\u043a […]<\/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-99604","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\udd47 Vulnerabilit\u00e0 nel pacchetto NPM node-netmask, utilizzato in 270.000 progetti | ProHoster","description":"Nel pacchetto NPM node-netmask, che conta circa 3 milioni di download a settimana ed \u00e8 utilizzato come dipendenza in oltre 270.000 progetti su GitHub, \u00e8 stata rilevata una vulnerabilit\u00e0 (CVE-2021-28918) che consente di eludere i 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