{"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\/cs\/blog\/news\/uyazvimost-v-npm-pakete-pac-resolver-naschityvayushhem-3-mln-zagruzok-v-nedelyu","title":{"rendered":"Zranitelnost v NPM bal\u00ed\u010dku pac-resolver, kter\u00fd m\u00e1 3 miliony sta\u017een\u00ed t\u00fddn\u011b","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V bal\u00ed\u010dku NPM pac-resolver, kter\u00fd m\u00e1 v\u00edce ne\u017e 3 miliony sta\u017een\u00ed t\u00fddn\u011b, byla odhalena zranitelnost (CVE-2021-23406), je\u017e umo\u017e\u0148uje spu\u0161t\u011bn\u00ed vlastn\u00edho JavaScriptov\u00e9ho k\u00f3du v kontextu aplikace p\u0159i odes\u00edl\u00e1n\u00ed HTTP po\u017eadavk\u016f z projekt\u016f Node.js, kter\u00e9 podporuj\u00ed funkci automatick\u00e9ho nastaven\u00ed proxy serveru. <\/p>\n

Bal\u00ed\u010dek pac-resolver prov\u00e1d\u00ed anal\u00fdzu PAC soubor\u016f, kter\u00e9 zahrnuj\u00ed skript pro automatick\u00e9 nastaven\u00ed proxy serveru. PAC soubor obsahuje b\u011b\u017en\u00fd JavaScriptov\u00fd k\u00f3d s funkc\u00ed FindProxyForURL, kter\u00e1 ur\u010duje logiku v\u00fdb\u011bru proxy na z\u00e1klad\u011b hostitele a dotazovan\u00e9ho URL. Podstata zranitelnosti spo\u010d\u00edv\u00e1 v tom, \u017ee k proveden\u00ed tohoto JavaScriptov\u00e9ho k\u00f3du v pac-resolveru se pou\u017e\u00edval poskytovan\u00fd API VM v Node.js, kter\u00fd umo\u017e\u0148uje prov\u00e1d\u011bt JavaScriptov\u00fd k\u00f3d v jin\u00e9m kontextu enginu V8. <\/p>\n

Tento API je v dokumentaci v\u00fdslovn\u011b ozna\u010den jako nevhodn\u00fd pro spou\u0161t\u011bn\u00ed k\u00f3du, kter\u00fd nen\u00ed d\u016fv\u011bryhodn\u00fd, proto\u017ee neposkytuje plnou izolaci spu\u0161t\u011bn\u00e9ho k\u00f3du a umo\u017e\u0148uje p\u0159\u00edstup k p\u016fvodn\u00edmu kontextu. Probl\u00e9m byl vy\u0159e\u0161en ve verzi pac-resolver 5.0.0, kter\u00e1 byla p\u0159evedena na pou\u017eit\u00ed knihovny vm2, je\u017e poskytuje vy\u0161\u0161\u00ed \u00farove\u0148 izolace vhodnou pro b\u011bh ned\u016fv\u011bryhodn\u00e9ho k\u00f3du.

\"Zranitelnost<\/center> <\/p>\n

P\u0159i pou\u017e\u00edv\u00e1n\u00ed zraniteln\u00e9 verze pac-resolveru m\u016f\u017ee \u00fato\u010dn\u00edk pomoc\u00ed speci\u00e1ln\u011b vytvo\u0159en\u00e9ho PAC souboru dos\u00e1hnout spu\u0161t\u011bn\u00ed sv\u00e9ho JavaScriptov\u00e9ho k\u00f3du v kontextu k\u00f3du projektu pou\u017e\u00edvaj\u00edc\u00edho Node.js, pokud v tomto projektu jsou pou\u017eity knihovny, kter\u00e9 maj\u00ed z\u00e1vislosti na pac-resolveru. Nejpopul\u00e1rn\u011bj\u0161\u00ed z problematick\u00fdch knihoven je Proxy-Agent, kter\u00e1 je uvedena mezi z\u00e1vislostmi u 360 projekt\u016f, v\u010detn\u011b urllib, aws-cdk, mailgun.js a firebase-tools, kter\u00e9 celkov\u011b p\u0159edstavuj\u00ed v\u00edce ne\u017e t\u0159i miliony sta\u017een\u00ed t\u00fddn\u011b. <\/p>\n

Pokud aplikace z\u00e1visl\u00e1 na pac-resolveru na\u010dte PAC soubor poskytovan\u00fd syst\u00e9mem podporuj\u00edc\u00edm protokol automatick\u00e9ho nastaven\u00ed proxy WPAD, mohou \u00fato\u010dn\u00edci s p\u0159\u00edstupem k m\u00edstn\u00ed s\u00edti vyu\u017e\u00edt \u0161\u00ed\u0159en\u00ed nastaven\u00ed proxy prost\u0159ednictv\u00edm DHCP k injekci \u0161kodliv\u00fdch PAC soubor\u016f.
\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 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\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 Zranitelnost v bal\u00ed\u010dku NPM pac-resolver, kter\u00fd m\u00e1 3 miliony sta\u017een\u00ed t\u00fddn\u011b | ProHoster","description":"V bal\u00ed\u010dku NPM pac-resolver, kter\u00fd m\u00e1 v\u00edce ne\u017e 3 miliony sta\u017een\u00ed t\u00fddn\u011b, byla odhalena zranitelnost (CVE-2021-23406), je\u017e umo\u017e\u0148uje spu\u0161t\u011bn\u00ed vlastn\u00edho JavaScriptov\u00e9ho 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