{"id":112136,"date":"2023-12-11T15:10:27","date_gmt":"2023-12-11T13:10:27","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-buildroot-pozvolyayushhie-cherez-mitm-ataku-vypolnit-kod-na-sborochnom-servere"},"modified":"2023-12-11T15:10:27","modified_gmt":"2023-12-11T13:10:27","slug":"uyazvimosti-v-buildroot-pozvolyayushhie-cherez-mitm-ataku-vypolnit-kod-na-sborochnom-servere","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimosti-v-buildroot-pozvolyayushhie-cherez-mitm-ataku-vypolnit-kod-na-sborochnom-servere","title":{"rendered":"Vulnerabilities in Buildroot allowing code execution on the build server via MITM attack","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W systemie budowy Buildroot, kt\u00f3ry jest ukierunkowany na tworzenie rozruchowych \u015brodowisk Linux dla system\u00f3w wbudowanych, zidentyfikowano sze\u015b\u0107 luk zabezpiecze\u0144, kt\u00f3re umo\u017cliwiaj\u0105 podczas przechwytywania ruchu tranzytowego (MITM) wprowadzenie zmian w generowanych obrazach systemowych lub organizacj\u0119 wykonania kodu na poziomie systemu budowy. Luki zabezpiecze\u0144 zosta\u0142y usuni\u0119te w wydaniach Buildroot 2023.02.8, 2023.08.4 i 2023.11. <\/p>\n

Pierwsze pi\u0119\u0107 luk (CVE-2023-45841, CVE-2023-45842, CVE-2023-45838, CVE-2023-45839, CVE-2023-45840) dotyczy kodu sprawdzania integralno\u015bci pakiet\u00f3w na podstawie hasz\u00f3w. Problemy polegaj\u0105 na mo\u017cliwo\u015bci u\u017cycia HTTP do pobierania plik\u00f3w i braku plik\u00f3w hashowych dla niekt\u00f3rych pakiet\u00f3w, co umo\u017cliwia manipulacj\u0119 zawarto\u015bci\u0105 tych pakiet\u00f3w, maj\u0105c mo\u017cliwo\u015b\u0107 przechwycenia ruchu budowy. serwera<\/a> (na przyk\u0142ad, gdy u\u017cytkownik \u0142\u0105czy si\u0119 przez sie\u0107 bezprzewodow\u0105 kontrolowan\u0105 przez atakuj\u0105cego). <\/p>\n

W szczeg\u00f3lno\u015bci pakiety aufs i aufs-util by\u0142y wczytywane przez HTTP i nie by\u0142y weryfikowane za pomoc\u0105 haszy. Hasze r\u00f3wnie\u017c brakowa\u0142y dla pakiet\u00f3w riscv64-elf-toolchain, versal-firmware i mxsldr, kt\u00f3re domy\u015blnie \u0142adowa\u0142y si\u0119 przez HTTPS, ale w przypadku problem\u00f3w wraca\u0142y do niewartego zaszyfrowania pobierania z hosta http:\/\/sources.buildroot.net. W przypadku braku plik\u00f3w '.hash' narz\u0119dzie Buildroot uznawa\u0142o weryfikacj\u0119 za pomy\u015bln\u0105 i przetwarza\u0142o pobrane pakiety, w tym stosowa\u0142o zawarte w pakietach poprawki i uruchamia\u0142o skrypty buduj\u0105ce. Maj\u0105c mo\u017cliwo\u015b\u0107 podmiany pobieranych pakiet\u00f3w, atakuj\u0105cy m\u00f3g\u0142 doda\u0107 do nich w\u0142asne poprawki lub pliki Makefiles, co pozwala\u0142o na wprowadzenie zmian w rezultacie obrazu lub skryptach systemu budowania i umo\u017cliwia\u0142o wykonanie swojego kodu. <\/p>\n

Sz\u00f3sta luka (CVE-2023-43608) zosta\u0142a spowodowana b\u0142\u0119dem w implementacji funkcjonalno\u015bci BR_NO_CHECK_HASH_FOR, kt\u00f3ra pozwala na wy\u0142\u0105czenie sprawdzania integralno\u015bci na podstawie hasz\u00f3w dla wybranych pakiet\u00f3w. Niekt\u00f3re pakiety, takie jak j\u0105dro Linux, U-Boot i versal-firmware, umo\u017cliwia\u0142y pobieranie najnowszych wersji, dla kt\u00f3rych jeszcze nie utworzono plik\u00f3w hashowych. Dla tych wersji stosowano opcj\u0119 BR_NO_CHECK_HASH_FOR, wy\u0142\u0105czaj\u0105c\u0105 sprawdzanie hash. Dane by\u0142y pobierane przez HTTPS, ale domy\u015blnie w przypadku awarii pobierania korzystano z powrotu do source.buildroot.net bez szyfrowania przez protok\u00f3\u0142 http:\/\/. Atakuj\u0105cy podczas ataku MITM m\u00f3g\u0142 zablokowa\u0107 po\u0142\u0105czenie z serwerem HTTPS, a wtedy pobieranie by\u0142o cofane na http:\/\/sources.buildroot.net.
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441\u0431\u043e\u0440\u043a\u0438 Buildroot, \u043d\u0430\u0446\u0435\u043b\u0435\u043d\u043d\u043e\u0439 \u043d\u0430 \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0437\u0430\u0433\u0440\u0443\u0437\u043e\u0447\u043d\u044b\u0445 Linux-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0439 \u0434\u043b\u044f \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0448\u0435\u0441\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0432 \u0445\u043e\u0434\u0435 \u043f\u0435\u0440\u0435\u0445\u0432\u0430\u0442\u0430 \u0442\u0440\u0430\u043d\u0437\u0438\u0442\u043d\u043e\u0433\u043e \u0442\u0440\u0430\u0444\u0438\u043a\u0430 (MITM) \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u043d\u0435\u0441\u0435\u043d\u0438\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432 \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0435 \u043e\u0431\u0440\u0430\u0437\u044b \u0438\u043b\u0438 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0441\u0431\u043e\u0440\u043e\u0447\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 Buildroot 2023.02.8, 2023.08.4 \u0438 2023.11. \u041f\u0435\u0440\u0432\u044b\u0435 \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-45841, CVE-2023-45842, CVE-2023-45838, CVE-2023-45839, CVE-2023-45840) \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0442 […]<\/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-112136","post","type-post","status-publish","format-standard","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\udd47Luki w Buildroot umo\u017cliwiaj\u0105ce wykonanie kodu na serwerze budowy za po\u015brednictwem ataku MITM | ProHoster","description":"W systemie budowania Buildroot, skoncentrowanym na tworzeniu rozruchowych \u015brodowisk Linux dla system\u00f3w wbudowanych, zidentyfikowano sze\u015b\u0107 luk, kt\u00f3re pozwalaj\u0105 na przeprowadzenie atak\u00f3w typu MITM w celu wprowadzenia zmian w ruchu tranzytowym.","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimosti-v-buildroot-pozvolyayushhie-cherez-mitm-ataku-vypolnit-kod-na-sborochnom-servere","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 Buildroot, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u0447\u0435\u0440\u0435\u0437 MITM-\u0430\u0442\u0430\u043a\u0443 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