{"id":103981,"date":"2022-05-09T09:36:45","date_gmt":"2022-05-09T07:36:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-rubygems-org-pozvolyayushhaya-podmenit-chuzhie-pakety"},"modified":"2022-05-09T09:36:45","modified_gmt":"2022-05-09T07:36:45","slug":"uyazvimost-v-rubygems-org-pozvolyayushhaya-podmenit-chuzhie-pakety","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-rubygems-org-pozvolyayushhaya-podmenit-chuzhie-pakety","title":{"rendered":"Zranitelnost na RubyGems.org, kter\u00e1 umo\u017e\u0148uje zam\u011bnit ciz\u00ed bal\u00ed\u010dky.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V repozit\u00e1\u0159i RubyGems.org byla odhalena kritick\u00e1 zranitelnost (CVE-2022-29176), kter\u00e1 umo\u017e\u0148uje nahradit n\u011bkter\u00e9 ciz\u00ed bal\u00ed\u010dky v repozit\u00e1\u0159i bez n\u00e1le\u017eit\u00e9ho opr\u00e1vn\u011bn\u00ed zah\u00e1jen\u00edm st\u00e1hnut\u00ed (yank) legitimn\u00edho bal\u00ed\u010dku a nahr\u00e1n\u00edm jin\u00e9ho souboru se stejn\u00fdm n\u00e1zvem a \u010d\u00edslem verze.      <\/p>\n<p>Pro \u00fasp\u011b\u0161nou exploataci zranitelnosti je t\u0159eba splnit t\u0159i podm\u00ednky:  <\/p>\n<ul>\n<li class=\"l\"> \u00datok m\u016f\u017ee b\u00fdt proveden pouze na bal\u00ed\u010dky, jejich\u017e n\u00e1zev obsahuje poml\u010dku.\n<li class=\"l\"> \u00dato\u010dn\u00edk by m\u011bl m\u00edt mo\u017enost um\u00edstit gem bal\u00ed\u010dek s \u010d\u00e1st\u00ed n\u00e1zvu a\u017e do poml\u010dky. Nap\u0159\u00edklad, pokud je \u00fatok proveden na bal\u00ed\u010dek \u201erails-html-sanitizer\u201c, \u00fato\u010dn\u00edk by m\u011bl um\u00edstit do repozit\u00e1\u0159e sv\u016fj vlastn\u00ed bal\u00ed\u010dek \u201erails-html\u201c.\n<li class=\"l\"> Bal\u00ed\u010dek, na kter\u00fd je \u00fatok zam\u011b\u0159en, mus\u00ed b\u00fdt vytvo\u0159en v posledn\u00edch 30 dnech nebo nebyl aktualizov\u00e1n po dobu 100 dn\u016f.  <\/ul>\n<p>Zranitelnost je zp\u016fsobena chybou v zpracov\u00e1n\u00ed akce \u201eyank\u201c, kter\u00e1 interpretuje \u010d\u00e1st n\u00e1zvu za poml\u010dkou jako n\u00e1zev platformy, co\u017e umo\u017enilo iniciovat odstran\u011bn\u00ed ciz\u00edch bal\u00ed\u010dk\u016f shoduj\u00edc\u00edch se s \u010d\u00e1st\u00ed n\u00e1zvu a\u017e do poml\u010dky. Konkr\u00e9tn\u011b v k\u00f3du zpracovatele operace \u201eyank\u201c byl pro vyhled\u00e1v\u00e1n\u00ed bal\u00ed\u010dk\u016f pou\u017eit v\u00fdrok \u201efind_by!(full_name: \u201e#{rubygem.name}-#{slug}\u201c)\u201c, p\u0159i\u010dem\u017e parameter \u201eslug\u201c byl p\u0159ed\u00e1v\u00e1n vlastn\u00edkem bal\u00ed\u010dku pro ur\u010den\u00ed odstra\u0148ovan\u00e9 verze. Vlastn\u00edk bal\u00ed\u010dku \u201erails-html\u201c mohl m\u00edsto verze \u201e1.2.3\u201c uv\u00e9st \u201esanitizer-1.2.3\u201c, co\u017e by vedlo k proveden\u00ed operace na ciz\u00edm bal\u00ed\u010dku \u201erails-html-sanitizer-1.2.3\u201c.      <\/p>\n<p>Probl\u00e9m byl odhalen bezpe\u010dnostn\u00edm v\u00fdzkumn\u00edkem v r\u00e1mci programov\u00e9ho odm\u011b\u0148ov\u00e1n\u00ed na HackerOne za nalezen\u00ed bezpe\u010dnostn\u00edch probl\u00e9m\u016f v zn\u00e1m\u00fdch otev\u0159en\u00fdch projektech. Probl\u00e9m byl odstran\u011bn v RubyGems.org 5. kv\u011btna a podle prohl\u00e1\u0161en\u00ed v\u00fdvoj\u00e1\u0159\u016f zat\u00edm neobjevili stopy exploatace zranitelnosti v protokolech za posledn\u00edch 18 m\u011bs\u00edc\u016f. Dosud byl proveden pouze povrchn\u00ed audit a v budoucnu se pl\u00e1nuje proveden\u00ed hloubkov\u011bj\u0161\u00edho prov\u011b\u0159en\u00ed.     <\/p>\n<p>Pro kontrolu sv\u00fdch projekt\u016f se doporu\u010duje analyzovat historii operac\u00ed v souboru Gemfile.lock, \u0161kodliv\u00e1 aktivita se projevuje p\u0159\u00edtomnost\u00ed zm\u011bn se zachov\u00e1n\u00edm n\u00e1zvu a verze nebo zm\u011bnou platformy (nap\u0159\u00edklad kdy\u017e byl bal\u00ed\u010dek gemname-1.2.3 aktualizov\u00e1n na gemname-1.2.3-java). Jako obranou metodou proti skryt\u00e9 v\u00fdm\u011bn\u011b bal\u00ed\u010dk\u016f v syst\u00e9mech kontinu\u00e1ln\u00ed integrace nebo p\u0159i publikaci projekt\u016f se v\u00fdvoj\u00e1\u0159\u016fm doporu\u010duje pou\u017e\u00edvat Bundler s mo\u017enostmi \u201e\u2014frozen\u201c nebo \u201e\u2014deployment\u201c pro zafixov\u00e1n\u00ed z\u00e1vislost\u00ed.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57155\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0438 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 RubyGems.org \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-29176), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0431\u0435\u0437 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0434\u043e\u043b\u0436\u043d\u044b\u0445 \u043f\u043e\u043b\u043d\u043e\u043c\u043e\u0447\u0438\u0439 \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0447\u0443\u0436\u0438\u0435 \u043f\u0430\u043a\u0435\u0442\u044b \u0432 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0438 \u043f\u0443\u0442\u0451\u043c \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438\u0437\u044a\u044f\u0442\u0438\u044f (yank) \u043b\u0435\u0433\u0438\u0442\u0438\u043c\u043d\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 \u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u0432\u043c\u0435\u0441\u0442\u043e \u043d\u0435\u0433\u043e \u0434\u0440\u0443\u0433\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430 \u0441 \u0442\u0435\u043c \u0436\u0435 \u0438\u043c\u0435\u043d\u0435\u043c \u0438 \u043d\u043e\u043c\u0435\u0440\u043e\u043c \u0432\u0435\u0440\u0441\u0438\u0438. \u0414\u043b\u044f \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0439 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0442\u0440\u0451\u0445 \u0443\u0441\u043b\u043e\u0432\u0438\u0439: \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u043d\u0430 \u043f\u0430\u043a\u0435\u0442\u044b, \u0432 \u0438\u043c\u0435\u043d\u0438 [&hellip;]<\/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-103981","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0438 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 RubyGems.org \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-29176), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0431\u0435\u0437 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0434\u043e\u043b\u0436\u043d\u044b\u0445 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kter\u00e1 umo\u017e\u0148uje bez n\u00e1le\u017eit\u00e9ho opr\u00e1vn\u011bn\u00ed nahradit n\u011bkter\u00e9 ciz\u00ed bal\u00ed\u010dky v repozit\u00e1\u0159i iniciov\u00e1n\u00edm vyjmut\u00ed (yank).","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-rubygems-org-pozvolyayushhaya-podmenit-chuzhie-pakety","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 RubyGems.org, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f 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\u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438\u0437\u044a\u044f\u0442\u0438\u044f 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