{"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\/sk\/blog\/news\/uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah","title":{"rendered":"Zranite\u013enos\u0165 v NPM bal\u00ed\u010dku node-netmask, ktor\u00fd sa pou\u017e\u00edva v 270 tis\u00edc projektoch","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V NPM bal\u00ed\u010dku node-netmask, ktor\u00fd m\u00e1 pribli\u017ene 3 mili\u00f3ny stiahnut\u00ed t\u00fd\u017edenne a sl\u00fa\u017ei ako z\u00e1vislos\u0165 pre viac ako 270 tis\u00edc projektov na GitHub, bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2021-28918), ktor\u00e1 umo\u017e\u0148uje ob\u00eds\u0165 kontroly, v ktor\u00fdch sa sie\u0165ov\u00e1 maska pou\u017e\u00edva na ur\u010denie pr\u00edslu\u0161nosti do rozsahov adries alebo na filtrovanie. Probl\u00e9m bol vyrie\u0161en\u00fd vo verzii node-netmask 2.0.0. <\/p>\n

Zranite\u013enos\u0165 umo\u017e\u0148uje spracovanie extern\u00e9ho IP adresy ako adresy z vn\u00fatornej siete a naopak, a pri ur\u010ditej logike pou\u017eitia modulu node-netmask v aplik\u00e1cii vykona\u0165 \u00fatoky SSRF (Server-side request forgery), RFI (Remote File Inclusion) a LFI (Local File Inclusion) na pr\u00edstup k zdrojom vo vn\u00fatornej sieti a zapojenie sa do re\u0165azca vykon\u00e1vania extern\u00fdch alebo lok\u00e1lnych s\u00faborov. Probl\u00e9m spo\u010d\u00edva v tom, \u017ee pod\u013ea \u0161pecifik\u00e1cie by sa mali re\u0165azcov\u00e9 hodnoty adries, ktor\u00e9 za\u010d\u00ednaj\u00fa nulou, interpretova\u0165 ako osmi\u010dkov\u00e9 \u010d\u00edsla, ale modul \u201enode-netmask\u201c t\u00fato zvl\u00e1\u0161tnos\u0165 nezoh\u013ead\u0148uje a spracov\u00e1va ich ako desiatkov\u00e9 \u010d\u00edsla. <\/p>\n

Napr\u00edklad, \u00fato\u010dn\u00edk m\u00f4\u017ee po\u017eiada\u0165 o lok\u00e1lny zdroj, uveden\u00edm hodnoty \u201e0177.0.0.1\u201c, ktor\u00e1 zodpoved\u00e1 \u201e127.0.0.1\u201c, ale modul \u201enode-netmask\u201c zavrhne nulu, a spracuje \u201e0177.0.0.1\u201c ako \u201e177.0.0.1\u201c, \u010do v aplik\u00e1cii pri vyhodnocovan\u00ed pravidiel pr\u00edstupu nedovol\u00ed ur\u010di\u0165 zhodu s \u201e127.0.0.1\u201c. Rovnako \u00fato\u010dn\u00edk m\u00f4\u017ee uvies\u0165 adresu \u201e0127.0.0.1\u201c, ktor\u00e1 by mala by\u0165 zhodn\u00e1 s \u201e87.0.0.1\u201c, ale v module \u201enode-netmask\u201c bude spracovan\u00e1 ako \u201e127.0.0.1\u201c. Rovnako sa d\u00e1 oklama\u0165 kontrola pr\u00edstupu k intranetov\u00fdm adres\u00e1m uveden\u00edm hodn\u00f4t ako \u201e012.0.0.1\u201c (ekvivalent \u201e10.0.0.1\u201c, ale pri kontrole bude spracovan\u00fd ako 12.0.0.1). <\/p>\n

V\u00fdskumn\u00edci, ktor\u00ed probl\u00e9m identifikovali, ozna\u010dili probl\u00e9m za katastrofick\u00fd a uviedli nieko\u013eko scen\u00e1rov \u00fatokov, ale v\u00e4\u010d\u0161ina z nich sa zd\u00e1 by\u0165 hypotetick\u00e1. Napr\u00edklad, hovor\u00ed sa o mo\u017enosti \u00fatoku na aplik\u00e1ciu postaven\u00fa na Node.js, ktor\u00e1 nadv\u00e4zuje vonkaj\u0161ie spojenia za \u00fa\u010delom po\u017eiadania o zdroj na z\u00e1klade parametrov alebo \u00fadajov z po\u017eiadavky, ale konkr\u00e9tna aplik\u00e1cia nie je pomenovan\u00e1 a nie je podrobne rozoberan\u00e1. Aj keby sa na\u0161li aplik\u00e1cie, ktor\u00e9 vykon\u00e1vaj\u00fa s\u0165ahovanie zdrojov na z\u00e1klade zadan\u00fdch IP adresy<\/a>, nie je \u00faplne jasn\u00e9, ako je mo\u017en\u00e9 zranite\u013enos\u0165 prakticky vyu\u017ei\u0165 bez pripojenia k lok\u00e1lnej sieti alebo bez z\u00edskania kontroly nad \u201ezrkadlov\u00fdmi\u201c IP adresami. <\/p>\n

Vedci len predpokladaj\u00fa, \u017ee vlastn\u00edci 87.0.0.1 (Telecom Italia) a 0177.0.0.1 (Brasil Telecom) maj\u00fa mo\u017enos\u0165 ob\u00eds\u0165 obmedzenie pr\u00edstupu k 127.0.0.1. Realistickej\u0161\u00edm scen\u00e1rom je vyu\u017eitie zranite\u013enosti na ob\u00eddenie r\u00f4znych blokovac\u00edch zoznamov realizovan\u00fdch na strane aplik\u00e1cie. Probl\u00e9m sa tie\u017e m\u00f4\u017ee pou\u017ei\u0165 na v\u00fdmenu defin\u00edcie intranetov\u00fdch rozsahov v NPM-module \u201eprivate-ip\u201c.
\n
Zdroj: 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 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[…]<\/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\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\udd47Zranite\u013enos\u0165 v NPM bal\u00edku node-netmask, pou\u017e\u00edvanom v 270 tis\u00edcoch projektoch | ProHoster","description":"V NPM bal\u00edku node-netmask, ktor\u00fd m\u00e1 okolo 3 mili\u00f3ny stiahnut\u00ed t\u00fd\u017edenne a pou\u017e\u00edva sa ako z\u00e1vislos\u0165 vo viac ako 270 tis\u00edc projektoch na GitHub-e, bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2021-28918), ktor\u00e1 umo\u017e\u0148uje 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