{"id":102221,"date":"2021-11-06T03:36:40","date_gmt":"2021-11-06T01:36:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak"},"modified":"2021-11-06T03:36:40","modified_gmt":"2021-11-06T01:36:40","slug":"zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak","title":{"rendered":"Z\u00edsk\u00e1n\u00ed kontroly nad zraniteln\u00fdmi servery GitLab za \u00fa\u010delem prov\u00e1d\u011bn\u00ed DDoS \u00fatok\u016f","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spole\u010dnost GitLab varovala u\u017eivatele p\u0159ed zv\u00fd\u0161enou aktivitou \u00fato\u010dn\u00edk\u016f, souvisej\u00edc\u00ed s vyu\u017e\u00edv\u00e1n\u00edm kritick\u00e9 zranitelnosti CVE-2021-22205, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed vlastn\u00edho k\u00f3du na serveru bez nutnosti ov\u011b\u0159en\u00ed, na kter\u00e9m je platforma GitLab pro spolupr\u00e1ci v oblasti v\u00fdvoje. <\/p>\n

Probl\u00e9m se projevuje v GitLab od verze 11.9 a byl vy\u0159e\u0161en ji\u017e v dubnov\u00fdch verz\u00edch GitLab 13.10.3, 13.9.6 a 13.8.8. Nicm\u00e9n\u011b, podle proveden\u00e9ho skenov\u00e1n\u00ed glob\u00e1ln\u00ed s\u00edt\u011b 31. \u0159\u00edjna z 60 tis\u00edc ve\u0159ejn\u011b p\u0159\u00edstupn\u00fdch instanc\u00ed GitLab, st\u00e1le na 50 % syst\u00e9m\u016f b\u011b\u017e\u00ed zastaral\u00e9 verze GitLab, kter\u00e9 jsou zraniteln\u00e9. Pot\u0159ebn\u00e9 aktualizace byly nainstalov\u00e1ny pouze na 21 % z prozkouman\u00fdch servery<\/a>, a u 29 % syst\u00e9m\u016f se nepoda\u0159ilo zjistit \u010d\u00edslo pou\u017e\u00edvan\u00e9 verze. <\/p>\n

Nedbalost spr\u00e1vc\u016f server\u016f s GitLab p\u0159i instalaci aktualizac\u00ed vedla k tomu, \u017ee zranitelnost za\u010dali \u00fato\u010dn\u00edci aktivn\u011b vyu\u017e\u00edvat, a za\u010dali instalovat na serverech<\/a> malware a p\u0159ipojovat je k s\u00edti botnetu, kter\u00fd se pod\u00edl\u00ed na prov\u00e1d\u011bn\u00ed DDoS \u00fatok\u016f. V pikov\u00e9m obdob\u00ed dosahoval objem provozu b\u011bhem DDoS \u00fatoku, generovan\u00e9m botnetem na z\u00e1klad\u011b zraniteln\u00fdch server\u016f GitLab, a\u017e 1 terabit za sekundu. <\/p>\n

Zranitelnost byla zp\u016fsobena nespr\u00e1vn\u00fdm zpracov\u00e1n\u00edm nahr\u00e1van\u00fdch soubor\u016f s obr\u00e1zky extern\u00edm parserem zalo\u017een\u00fdm na knihovn\u011b ExifTool. Zranitelnost v ExifTool (CVE-2021-22204) umo\u017enila prov\u00e1d\u011bt libovoln\u00e9 p\u0159\u00edkazy v syst\u00e9mu p\u0159i anal\u00fdze metadat ze soubor\u016f ve form\u00e1tu DjVu: (metadata \t (Copyright «\ » . qx{echo test >\\\/tmp\\\/test} . \ » b «) ) <\/p>\n

P\u0159i\u010dem\u017e, proto\u017ee skute\u010dn\u00fd form\u00e1t ur\u010doval ExifTool podle MIME typu obsahu, nikoli podle p\u0159\u00edpony souboru, mohl \u00fato\u010dn\u00edk nahr\u00e1t DjVu dokument s exploit ve form\u00e1tu b\u011b\u017en\u00e9ho JPG nebo TIFF obr\u00e1zku (GitLab vyvol\u00e1v\u00e1 ExifTool pro v\u0161echny soubory s p\u0159\u00edponami jpg, jpeg a tiff k \u010di\u0161t\u011bn\u00ed nadbyte\u010dn\u00fdch tag\u016f). P\u0159\u00edklad exploitu. V konfiguraci GitLab CE je na default\u011b \u00fatok provediteln\u00fd zasl\u00e1n\u00edm dvou po\u017eadavk\u016f, kter\u00e9 nevy\u017eaduj\u00ed ov\u011b\u0159en\u00ed.

\"Z\u00edsk\u00e1n\u00ed<\/center> <\/p>\n

U\u017eivatel\u00e9 GitLab by m\u011bli zajistit, \u017ee pou\u017e\u00edvaj\u00ed aktu\u00e1ln\u00ed verzi, a v p\u0159\u00edpad\u011b pou\u017eit\u00ed zastaral\u00e9 verze ihned nainstalovat aktualizace, a pokud to z n\u011bjak\u00e9ho d\u016fvodu nen\u00ed mo\u017en\u00e9, selektivn\u011b aplikovat z\u00e1platu blokuj\u00edc\u00ed projevy zranitelnosti. U\u017eivatel\u016fm neaktualizovan\u00fdch syst\u00e9m\u016f se tak\u00e9 doporu\u010duje ov\u011b\u0159it, \u017ee jejich syst\u00e9m nebyl kompromitov\u00e1n, anal\u00fdzou log\u016f a kontrolou podez\u0159el\u00fdch \u00fa\u010dt\u016f \u00fato\u010dn\u00edk\u016f (nap\u0159\u00edklad dexbcx, dexbcx818, dexbcxh, dexbcxi a dexbcxa99).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f GitLab \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u043e\u0431 \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u0438 \u0430\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u0432, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0439 \u0441 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0435\u0439 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CVE-2021-22205, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435, \u043d\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430 \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u043d\u043e\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 GitLab. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 GitLab \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 11.9 \u0438 \u0431\u044b\u043b\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0435\u0449\u0451 \u0432 \u0430\u043f\u0440\u0435\u043b\u0435 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 GitLab 13.10.3, 13.9.6 \u0438 13.8.8. \u0422\u0435\u043c […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":102222,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102221","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\udd47Z\u00edsk\u00e1n\u00ed kontroly nad zraniteln\u00fdmi servery GitLab k zapojen\u00ed do DDoS \u00fatok\u016f | ProHoster","description":"Spole\u010dnost GitLab varovala u\u017eivatele p\u0159ed zv\u00fd\u0161enou aktivitou \u00fato\u010dn\u00edk\u016f spojenou s exploitac\u00ed kritick\u00e9 zranitelnosti CVE-2021-22205, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 proveden\u00ed k\u00f3du bez autentizace.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak","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\u0417\u0430\u0445\u0432\u0430\u0442 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044f \u043d\u0430\u0434 \u0443\u044f\u0437\u0432\u0438\u043c\u044b\u043c\u0438 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