{"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\/pl\/blog\/news\/zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak","title":{"rendered":"Przej\u0119cie kontroli nad podatnymi serwerami GitLab w celu zaanga\u017cowania ich w przeprowadzanie atak\u00f3w DDoS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Firma GitLab ostrzeg\u0142a u\u017cytkownik\u00f3w o zwi\u0119kszonej aktywno\u015bci haker\u00f3w zwi\u0105zanej z wykorzystaniem krytycznej luki CVE-2021-22205, kt\u00f3ra pozwala na zdalne wykonanie w\u0142asnego kodu na serwerze, na kt\u00f3rym u\u017cywana jest platforma do wsp\u00f3lnej pracy GitLab, bez konieczno\u015bci autoryzacji. <\/p>\n

Problem wyst\u0119puje w GitLab od wersji 11.9 i zosta\u0142 rozwi\u0105zany w kwietniu w wersjach GitLab 13.10.3, 13.9.6 oraz 13.8.8. Niemniej jednak, wed\u0142ug badania przeprowadzonego 31 pa\u017adziernika, z 60 tysi\u0119cy publicznie dost\u0119pnych instancji GitLab, 50% system\u00f3w nadal u\u017cywa przestarza\u0142ych wersji GitLab, kt\u00f3re s\u0105 nara\u017cone na t\u0119 luk\u0119. Wymagane aktualizacje zosta\u0142y zainstalowane tylko na 21% z sprawdzonych serwer\u00f3w<\/a>, a na 29% system\u00f3w nie uda\u0142o si\u0119 ustali\u0107 numeru u\u017cywanej wersji. <\/p>\n

Lekkomy\u015blne podej\u015bcie administrator\u00f3w serwer\u00f3w z GitLab do instalacji aktualizacji doprowadzi\u0142o do tego, \u017ce luka zacz\u0119\u0142a by\u0107 aktywnie wykorzystywana przez haker\u00f3w, kt\u00f3rzy zacz\u0119li umieszcza\u0107 na serwerach<\/a> z\u0142o\u015bliwe oprogramowanie i \u0142\u0105czy\u0107 je z botnetem bior\u0105cym udzia\u0142 w przeprowadzaniu atak\u00f3w DDoS. W szczytowym momencie obj\u0119to\u015b\u0107 ruchu generowanego podczas ataku DDoS przez botnet na bazie podatnych serwer\u00f3w GitLab osi\u0105ga\u0142a 1 terabit na sekund\u0119. <\/p>\n

Wra\u017cliwo\u015b\u0107 wynika z niew\u0142a\u015bciwego przetwarzania przesy\u0142anych plik\u00f3w graficznych przez zewn\u0119trzny parser oparty na bibliotece ExifTool. Wra\u017cliwo\u015b\u0107 w ExifTool (CVE-2021-22204) pozwala\u0142a na wykonanie dowolnych polece\u0144 w systemie podczas analizy metadanych z plik\u00f3w w formacie DjVu: (metadata \t (Copyright «\ » . qx{echo test >\\\/tmp\\\/test} . \ » b «) ) <\/p>\n

Przy czym, poniewa\u017c faktyczny format by\u0142 okre\u015blany w ExifTool na podstawie typu MIME zawarto\u015bci, a nie rozszerzenia pliku, atakuj\u0105cy m\u00f3g\u0142 przes\u0142a\u0107 dokument DjVu z eksploitem w postaci zwyk\u0142ego obrazu JPG lub TIFF (GitLab wywo\u0142uje ExifTool dla wszystkich plik\u00f3w z rozszerzeniami jpg, jpeg i tiff, aby oczy\u015bci\u0107 zb\u0119dne tagi). Przyk\u0142ad eksploita. W domy\u015blnej konfiguracji GitLab CE atak mo\u017cna przeprowadzi\u0107 poprzez wys\u0142anie dw\u00f3ch \u017c\u0105da\u0144, kt\u00f3re nie wymagaj\u0105 autoryzacji.

\"Przej\u0119cie<\/center> <\/p>\n

U\u017cytkownicy GitLab powinni upewni\u0107 si\u0119, \u017ce korzystaj\u0105 z aktualnej wersji, a w przypadku korzystania z przestarza\u0142ej wersji pilnie zainstalowa\u0107 aktualizacje. Je\u015bli z jakich\u015b powod\u00f3w jest to niemo\u017cliwe, nale\u017cy selektywnie zastosowa\u0107 \u0142atk\u0119, kt\u00f3ra zablokuje wyst\u0105pienie luki. U\u017cytkownicy nieaktualnych system\u00f3w powinni r\u00f3wnie\u017c upewni\u0107 si\u0119, \u017ce ich system nie zosta\u0142 skompromitowany, analizuj\u0105c logi i sprawdzaj\u0105c obecno\u015b\u0107 podejrzanych kont atakuj\u0105cych (np. dexbcx, dexbcx818, dexbcxh, dexbcxi i dexbcxa99).
\n
\u0179r\u00f3d\u0142o: 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\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\udd47Przej\u0119cie kontroli nad podatnymi serwerami GitLab, aby zaanga\u017cowa\u0107 si\u0119 w przeprowadzanie atak\u00f3w DDoS | ProHoster","description":"Firma GitLab ostrzeg\u0142a u\u017cytkownik\u00f3w o zwi\u0119kszonej aktywno\u015bci przest\u0119pc\u00f3w zwi\u0105zanej z wykorzystaniem krytycznej luki CVE-2021-22205, kt\u00f3ra pozwala na zdalne wykonanie kodu bez przechodzenia autoryzacji.","canonical_url":"https:\/\/prohoster.info\/pl\/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":"pl_PL","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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