{"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\/cs\/blog\/news\/uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah","title":{"rendered":"Zranitelnost v NPM bal\u00ed\u010dku node-netmask, pou\u017e\u00edvan\u00e9m ve 270 tis\u00edc\u00edch projektech","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V bal\u00ed\u010dku NPM node-netmask, kter\u00fd m\u00e1 p\u0159ibli\u017en\u011b 3 miliony sta\u017een\u00ed t\u00fddn\u011b a je pou\u017e\u00edv\u00e1n jako z\u00e1vislost v\u00edce ne\u017e 270 tis\u00edci projekt\u016f na GitHubu, byla zji\u0161t\u011bna zranitelnost (CVE-2021-28918), kter\u00e1 umo\u017e\u0148uje obej\u00edt kontroly, v nich\u017e je s\u00ed\u0165ov\u00e1 maska pou\u017eita k ur\u010den\u00ed za\u0159azen\u00ed do adresn\u00edch rozsah\u016f nebo k filtrov\u00e1n\u00ed. Probl\u00e9m byl odstran\u011bn ve verzi node-netmask 2.0.0. <\/p>\n

Zranitelnost umo\u017e\u0148uje interpretaci vn\u011bj\u0161\u00ed IP adresy jako adresy z vnit\u0159n\u00ed s\u00edt\u011b a naopak. P\u0159i ur\u010dit\u00e9 logice pou\u017eit\u00ed modulu node-netmask v aplikaci m\u016f\u017ee doch\u00e1zet k \u00fatok\u016fm SSRF (Server-side Request Forgery), RFI (Remote File Inclusion) a LFI (Local File Inclusion) za \u00fa\u010delem p\u0159\u00edstupu k zdroj\u016fm ve vnit\u0159n\u00ed s\u00edti a za\u0159azen\u00ed extern\u00edch nebo m\u00edstn\u00edch soubor\u016f do pot\u0159ebn\u00e9ho \u0159et\u011bzce vykon\u00e1v\u00e1n\u00ed. Probl\u00e9m spo\u010d\u00edv\u00e1 v tom, \u017ee podle specifikace by m\u011bla b\u00fdt hodnoty adres za\u010d\u00ednaj\u00edc\u00ed nulou interpretov\u00e1na jako osmi\u010dkov\u00e1 \u010d\u00edsla, ale modul \"node-netmask\" tuto vlastnost nezohled\u0148uje a zpracov\u00e1v\u00e1 je jako desetinn\u00e1 \u010d\u00edsla. <\/p>\n

Nap\u0159\u00edklad \u00fato\u010dn\u00edk m\u016f\u017ee po\u017e\u00e1dat o lok\u00e1ln\u00ed zdroj s hodnotou \"0177.0.0.1\", kter\u00e1 odpov\u00edd\u00e1 \"127.0.0.1\", ale modul \"node-netmask\" zahod\u00ed nulu a zpracuje \"0177.0.0.1\" jako \"177.0.0.1\", co\u017e v aplikaci p\u0159i hodnocen\u00ed pravidel p\u0159\u00edstupu nezam\u011bn\u00ed s \"127.0.0.1\". Podobn\u011b m\u016f\u017ee \u00fato\u010dn\u00edk uv\u00e9st adresu \"0127.0.0.1\", kter\u00e1 by m\u011bla odpov\u00eddat \"87.0.0.1\", ale v modulu \"node-netmask\" bude zpracov\u00e1na jako \"127.0.0.1\". Stejn\u011b tak lze oklamat kontrolu p\u0159\u00edstupu k intranetov\u00fdm adres\u00e1m uveden\u00edm hodnot jako \"012.0.0.1\" (ekvivalent \"10.0.0.1\", ale p\u0159i hodnocen\u00ed bude zpracov\u00e1na jako 12.0.0.1). <\/p>\n

V\u00fdzkumn\u00edci, kte\u0159\u00ed probl\u00e9m odhalili, ozna\u010duj\u00ed probl\u00e9m za katastrof\u00e1ln\u00ed a uv\u00e1d\u011bj\u00ed n\u011bkolik sc\u00e9n\u00e1\u0159\u016f \u00fatok\u016f, ale v\u011bt\u0161ina z nich se zd\u00e1 b\u00fdt spekulativn\u00ed. Nap\u0159\u00edklad se hovo\u0159\u00ed o mo\u017enosti \u00fatoku na aplikaci postavenou na Node.js, kter\u00e1 vytv\u00e1\u0159\u00ed vn\u011bj\u0161\u00ed spojen\u00ed pro po\u017eadov\u00e1n\u00ed prost\u0159edku na z\u00e1klad\u011b parametr\u016f nebo dat vstupn\u00edho po\u017eadavku, ale konkr\u00e9tn\u00ed aplikace nejsou zm\u00edn\u011bny a podrobnosti nejsou uvedeny. I kdy\u017e se najdou aplikace, kter\u00e9 prov\u00e1d\u011bj\u00ed stahov\u00e1n\u00ed prost\u0159edk\u016f na z\u00e1klad\u011b zadan\u00fdch IP adress<\/a>, nen\u00ed zcela jasn\u00e9, jak by bylo mo\u017en\u00e9 zranitelnost prakticky vyu\u017e\u00edt bez p\u0159ipojen\u00ed k m\u00edstn\u00ed s\u00edti nebo bez z\u00edsk\u00e1n\u00ed kontroly nad \"zrcadlov\u00fdmi\" IP adresami. <\/p>\n

V\u00fdzkumn\u00edci pouze p\u0159edpokl\u00e1daj\u00ed, \u017ee vlastn\u00edci 87.0.0.1 (Telecom Italia) a 0177.0.0.1 (Brasil Telecom) maj\u00ed schopnost obej\u00edt omezen\u00ed p\u0159\u00edstupu k 127.0.0.1. Realisti\u010dt\u011bj\u0161\u00ed sc\u00e9n\u00e1\u0159 p\u0159edstavuje vyu\u017eit\u00ed zranitelnosti k obch\u00e1zen\u00ed r\u016fzn\u00fdch blokovac\u00edch seznam\u016f implementovan\u00fdch na stran\u011b aplikace. Probl\u00e9m m\u016f\u017ee b\u00fdt tak\u00e9 aplikov\u00e1n na v\u00fdm\u011bnu definice intranetov\u00fdch rozsah\u016f v NPM modulu \"private-ip\".
\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 \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\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\udd47Zranitelnost v NPM bal\u00ed\u010dku node-netmask pou\u017eit\u00ed ve 270 tis\u00edc\u00edch projektech | ProHoster","description":"V NPM bal\u00ed\u010dku node-netmask, kter\u00fd m\u00e1 p\u0159ibli\u017en\u011b 3 miliony sta\u017een\u00ed t\u00fddn\u011b a je pou\u017e\u00edv\u00e1n jako z\u00e1vislost ve v\u00edce ne\u017e 270 tis\u00edc\u00edch projektech na GitHubu, byla odhalena zranitelnost (CVE-2021-28918), 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