{"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 mila 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 bypassare le verifiche in cui la maschera di rete viene utilizzata per determinare l'appartenenza a intervalli di indirizzi o per il filtraggio. Il problema \u00e8 stato risolto nella versione node-netmask 2.0.0. <\/p>\n

La vulnerabilit\u00e0 consente di trattare un indirizzo IP esterno come un indirizzo di rete interna e viceversa e, con una certa logica nell'uso del modulo node-netmask nell'applicazione, di eseguire attacchi SSRF (Server-side request forgery), RFI (Remote File Inclusion) e LFI (Local File Inclusion) per accedere alle risorse all'interno della rete e includere nella catena di esecuzione file esterni o locali. Il problema \u00e8 che, secondo la specifica, i valori stringa degli indirizzi che iniziano con zero devono essere interpretati come numeri ottali, ma il modulo \u00abnode-netmask\u00bb non tiene conto di questa peculiarit\u00e0 e li elabora come numeri decimali. <\/p>\n

Ad esempio, un attaccante pu\u00f2 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 impedir\u00e0 all'applicazione di riconoscerlo come equivalente a \u00ab127.0.0.1\u00bb durante la valutazione delle regole di accesso. Analogamente, un attaccante pu\u00f2 specificare l'indirizzo \u00ab0127.0.0.1\u00bb, che dovrebbe corrispondere a \u00ab87.0.0.1\u00bb, ma nel modulo \u00abnode-netmask\u00bb sar\u00e0 elaborato come \u00ab127.0.0.1\u00bb. \u00c8 possibile ingannare anche il controllo degli indirizzi intranet specificando valori come \u00ab012.0.0.1\u00bb (equivalente a \u00ab10.0.0.1\u00bb, ma sar\u00e0 trattato durante il controllo come \u00ab12.0.0.1\u00bb). <\/p>\n

I ricercatori che hanno individuato il problema lo definiscono catastrofico e forniscono diversi scenari di attacco, ma la maggior parte di essi appare ipotetica. Ad esempio, si parla della possibilit\u00e0 di attaccare un'applicazione basata su Node.js, che stabilisce connessioni esterne per richiedere risorse in base ai parametri o ai dati della richiesta in ingresso, ma non viene specificato alcun nome di applicazione n\u00e9 si forniscono dettagli. Anche se si trovano applicazioni che caricano risorse in base agli input indirizzi IP<\/a>, non \u00e8 del tutto chiaro come sia possibile applicare la vulnerabilit\u00e0 nella pratica senza essere connessi a una rete locale o senza ottenere il controllo sugli indirizzi IP \u201cspeculari\u201d. <\/p>\n

I ricercatori sospettano che i proprietari di \u00ab87.0.0.1\u00bb (Telecom Italia) e \u00ab0177.0.0.1\u00bb (Brasil Telecom) possano aggirare le restrizioni di accesso a \u00ab127.0.0.1\u00bb. Uno scenario pi\u00f9 realistico \u00e8 l'uso della vulnerabilit\u00e0 per eludere vari elenchi di blocco implementati a livello di applicazione. Il problema potrebbe anche essere utilizzato per scambiare definizioni di 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\udd47Vulnerabilit\u00e0 nel pacchetto NPM node-netmask, utilizzato in 270 mila progetti | ProHoster","description":"Nel pacchetto NPM node-netmask, che registra circa 3 milioni di download a settimana e viene utilizzato come dipendenza da oltre 270 mila progetti su GitHub, \u00e8 stata scoperta una vulnerabilit\u00e0 (CVE-2021-28918) che permette di bypassare i controlli 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