{"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\/hu\/blog\/news\/uyazvimost-v-npm-pakete-pac-resolver-naschityvayushhem-3-mln-zagruzok-v-nedelyu","title":{"rendered":"Vulnerabilit\u00e1s az NPM csomagban, pac-resolver, heti 3 milli\u00f3 let\u00f6lt\u00e9ssel.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A pac-resolver NPM csomagban, amely t\u00f6bb mint 3 milli\u00f3s let\u00f6lt\u00e9ssel rendelkezik hetente, egy s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2021-23406) fedeztek fel, amely lehet\u0151v\u00e9 teszi a saj\u00e1t JavaScript-k\u00f3d v\u00e9grehajt\u00e1s\u00e1t az alkalmaz\u00e1s kontextus\u00e1ban HTTP-k\u00e9r\u00e9sek k\u00fcld\u00e9sekor Node.js projektekb\u0151l, amelyek t\u00e1mogatj\u00e1k a proxyautomatikus be\u00e1ll\u00edt\u00e1s funkci\u00f3j\u00e1t. <\/p>\n

A pac-resolver csomag PAC-f\u00e1jlok \u00e9rtelmez\u00e9s\u00e9t v\u00e9gzi, amelyek tartalmazz\u00e1k a proxyautomatikus be\u00e1ll\u00edt\u00e1st v\u00e9gz\u0151 JavaScript-k\u00f3dot. A PAC-f\u00e1jl egy szokv\u00e1nyos JavaScript-k\u00f3dot tartalmaz a FindProxyForURL funkci\u00f3val, amely meghat\u00e1rozza a proxy kiv\u00e1laszt\u00e1s\u00e1nak logik\u00e1j\u00e1t a gazda \u00e9s a k\u00e9rt URL alapj\u00e1n. A s\u00e9r\u00fcl\u00e9kenys\u00e9g l\u00e9nyege, hogy a pac-resolver JavaScript-k\u00f3d v\u00e9grehajt\u00e1s\u00e1hoz a Node.js API VM szolg\u00e1ltat\u00e1s\u00e1t haszn\u00e1lja, amely lehet\u0151v\u00e9 teszi a JavaScript-k\u00f3d m\u00e1s V8 motor kontextusban t\u00f6rt\u00e9n\u0151 v\u00e9grehajt\u00e1s\u00e1t. <\/p>\n

A megadott API a dokument\u00e1ci\u00f3ban kifejezetten \u00fagy van megjel\u00f6lve, mint nem megb\u00edzhat\u00f3 k\u00f3d futtat\u00e1s\u00e1ra alkalmas, mivel nem biztos\u00edt teljes k\u00f6r\u0171 elk\u00fcl\u00f6n\u00edt\u00e9st a v\u00e9grehajtott k\u00f3d sz\u00e1m\u00e1ra, \u00e9s lehet\u0151v\u00e9 teszi az eredeti kontextus el\u00e9r\u00e9s\u00e9t. A probl\u00e9m\u00e1t a pac-resolver 5.0.0-\u00e1s verzi\u00f3j\u00e1ban orvosolt\u00e1k, amely \u00e1tt\u00e9rt a vm2 k\u00f6nyvt\u00e1r haszn\u00e1lat\u00e1ra, amely magasabb szint\u0171 izol\u00e1ci\u00f3t ny\u00fajt, megfelel\u0151 a megb\u00edzhatatlan k\u00f3d futtat\u00e1s\u00e1hoz.

\"Vulnerabilit\u00e1s<\/center> <\/p>\n

A pac-resolver s\u00e9r\u00fcl\u00e9keny verzi\u00f3j\u00e1nak haszn\u00e1lata eset\u00e9n a t\u00e1mad\u00f3 egy megfelel\u0151en form\u00e1zott PAC-f\u00e1jl \u00e1tad\u00e1s\u00e1val el\u00e9rheti a saj\u00e1t JavaScript-k\u00f3dj\u00e1t a Node.js-t haszn\u00e1l\u00f3 projekt k\u00f3dj\u00e1nak kontextus\u00e1ban, ha a projektben a pac-resolver-hez kapcsol\u00f3d\u00f3 f\u00fcgg\u0151s\u00e9gek tal\u00e1lhat\u00f3k. A legelterjedtebb probl\u00e9m\u00e1s k\u00f6nyvt\u00e1r a Proxy-Agent, amely 360 projekt f\u00fcgg\u0151s\u00e9gei k\u00f6z\u00f6tt szerepel, bele\u00e9rtve az urllib, aws-cdk, mailgun.js \u00e9s firebase-tools, \u00f6sszesen t\u00f6bb mint h\u00e1rommilli\u00f3s let\u00f6lt\u00e9ssel hetente. <\/p>\n

Ha a pac-resolver-hez kapcsol\u00f3d\u00f3 f\u00fcgg\u0151s\u00e9gekkel rendelkez\u0151 alkalmaz\u00e1s egy WPAD protokollt t\u00e1mogat\u00f3 rendszer \u00e1ltal biztos\u00edtott PAC-f\u00e1jlt t\u00f6lt be, akkor a helyi h\u00e1l\u00f3zathoz hozz\u00e1f\u00e9r\u00e9ssel rendelkez\u0151 t\u00e1mad\u00f3k kihaszn\u00e1lhatj\u00e1k a DHCP-n kereszt\u00fcli proxybe\u00e1ll\u00edt\u00e1sok terjeszt\u00e9s\u00e9t a rosszindulat\u00fa PAC-f\u00e1jlok behelyettes\u00edt\u00e9s\u00e9re.
\n
Forr\u00e1s: 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\udd47S\u00e9r\u00fcl\u00e9kenys\u00e9g az NPM pac-resolver csomagban, amely hetente 3 milli\u00f3 let\u00f6lt\u00e9ssel b\u00edr | ProHoster","description":"A pac-resolver NPM csomagban, amely t\u00f6bb mint 3 milli\u00f3s let\u00f6lt\u00e9ssel rendelkezik hetente, egy s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2021-23406) fedeztek fel, amely lehet\u0151v\u00e9 teszi a saj\u00e1t JavaScript-k\u00f3d 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