{"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\/hr\/blog\/news\/zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak","title":{"rendered":"Preuzimanje kontrole nad ranjivim GitLab serverima za provo\u0111enje DDoS napada","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Tvrtka GitLab upozorila je korisnike na pove\u0107anu aktivnost napada\u010da vezanu uz iskori\u0161tavanje kriti\u010dne ranjivosti CVE-2021-22205, koja omogu\u0107uje daljinsko izvr\u0161avanje vlastitog koda na serveru na kojem se koristi platforma za suradni\u010dki razvoj GitLab bez autentifikacije. <\/p>\n

Problem se javlja u GitLab-u po\u010dev\u0161i od verzije 11.9 i rije\u0161en je u travnju u izdanjima GitLab 13.10.3, 13.9.6 i 13.8.8. Ipak, prema skeniranju globalne mre\u017ee 31. listopada me\u0111u 60 tisu\u0107a javno dostupnih GitLab instanci, 50% sustava i dalje koristi zastarjele verzije GitLab-a podlo\u017ene ranjivosti. Potrebna a\u017euriranja instalirana su samo na 21% provjerenih sustava, poslu\u017eitelja<\/a>, a na 29% sustava nije bilo mogu\u0107e odrediti broj verzije koja se koristi. <\/p>\n

Nepazljivo pona\u0161anje administratora servera s GitLab-om prema instalaciji a\u017euriranja dovelo je do toga da su napada\u010di po\u010deli aktivno iskori\u0161tavati ranjivost, postavljaju\u0107i poslu\u017eiteljima<\/a> maliciozni softver i povezuju\u0107i ih s botnetom uklju\u010denim u provo\u0111enje DDoS napada. U vrhuncu, koli\u010dina prometa tijekom DDoS napada uzrokovanog botnetom na osnovi ranjivih GitLab servera dosezala je 1 terabit u sekundi. <\/p>\n

Ranljivost je uzrokovana neispravnim postupkom prilikom obrade u\u010ditanih datoteka sa slikama putem vanjskog parsera koji se temelji na knji\u017enici ExifTool. Ranljivost u ExifTool-u (CVE-2021-22204) omogu\u0107ila je izvr\u0161avanje proizvoljnih komandi u sustavu prilikom analize metapodataka iz datoteka u formatu DjVu: (metadata \t (Copyright . qx{echo test >\\\/tmp\\\/test} . > b <)) <\/p>\n

Pri tome, s obzirom na to da je stvarni format odre\u0111ivan u ExifToolu prema MIME tipu sadr\u017eaja, a ne ekstenziji datoteke, napada\u010d je mogao u\u010ditati DjVu dokument s exploitom pod krinkom obi\u010dne JPG ili TIFF slike (GitLab poziva ExifTool za sve datoteke s ekstenzijama jpg, jpeg i tiff radi \u010di\u0161\u0107enja suvi\u0161nih oznaka). Primjer exploita. U konfiguraciji GitLab CE po defaultu, napad se mo\u017ee provesti slanjem dva zahtjeva, koja ne zahtijevaju autentifikaciju.

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

Korisnicima GitLaba se preporu\u010duje da osiguraju kori\u0161tenje a\u017eurirane verzije i u slu\u010daju kori\u0161tenja zastarjele verzije hitno instaliraju a\u017euriranja, a ako to iz nekog razloga nije mogu\u0107e, selektivno primijene zakrpu koja blokira manifestaciju ranjivosti. Korisnicima ne a\u017euriranih sustava tako\u0111er se preporu\u010duje da provjere nije li njihov sustav kompromitiran analiziraju\u0107i logove i provjeravaju\u0107i prisutnost sumnjivih napada\u010dkih ra\u010duna (na primjer, dexbcx, dexbcx818, dexbcxh, dexbcxi i dexbcxa99).
\n
Izvor: 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\udd47Preuzimanje kontrole nad ranjivim GitLab poslu\u017eiteljima za sudjelovanje u DDoS napadima | ProHoster","description":"Tvrtka GitLab upozorila je korisnike na pove\u0107anu aktivnost napada\u010da povezanih s iskori\u0161tavanjem kriti\u010dne ranjivosti CVE-2021-22205, koja omogu\u0107uje daljinsko izvr\u0161enje bez autentikacije.","canonical_url":"https:\/\/prohoster.info\/hr\/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":"hr_HR","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 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438 GitLab \u0434\u043b\u044f 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