V syst\u00e9mu Buildroot, zam\u011b\u0159en\u00e9m na vytv\u00e1\u0159en\u00ed zav\u00e1d\u011bc\u00edch Linuxov\u00fdch prost\u0159ed\u00ed pro vestav\u011bn\u00e9 syst\u00e9my, byly odhaleny \u0161est zranitelnost\u00ed, kter\u00e9 umo\u017e\u0148uj\u00ed b\u011bhem odposlechu pr\u016fchoz\u00edho provozu (MITM) prov\u00e1d\u011bt zm\u011bny v generovan\u00fdch syst\u00e9mov\u00fdch obrazech nebo prov\u00e1d\u011bt k\u00f3d na \u00farovni stavebn\u00edho syst\u00e9mu. Zranitelnosti byly odstran\u011bny ve verz\u00edch Buildroot 2023.02.8, 2023.08.4 a 2023.11. <\/p>\n
Prvn\u00edch p\u011bt zranitelnost\u00ed (CVE-2023-45841, CVE-2023-45842, CVE-2023-45838, CVE-2023-45839, CVE-2023-45840) se t\u00fdk\u00e1 k\u00f3du pro ov\u011b\u0159ov\u00e1n\u00ed integrity bal\u00ed\u010dk\u016f podle hash\u016f. Probl\u00e9my spo\u010d\u00edvaj\u00ed v mo\u017enosti pou\u017eit\u00ed HTTP pro stahov\u00e1n\u00ed soubor\u016f a absenci ov\u011b\u0159ovac\u00edch hash-soubor\u016f pro n\u011bkter\u00e9 bal\u00ed\u010dky, co\u017e umo\u017e\u0148uje podvrhnout obsah t\u011bchto bal\u00ed\u010dk\u016f, ani\u017e by bylo t\u0159eba zasahovat do stavebn\u00edho provozu. serveru<\/a> (nap\u0159\u00edklad p\u0159i p\u0159ipojen\u00ed u\u017eivatele p\u0159es bezdr\u00e1tovou s\u00ed\u0165 kontrolovanou \u00fato\u010dn\u00edkem). <\/p>\n Zejm\u00e9na bal\u00ed\u010dky aufs a aufs-util byly na\u010d\u00edt\u00e1ny p\u0159es HTTP a nebyly ov\u011b\u0159ov\u00e1ny pomoc\u00ed hash\u016f. Hashy tak\u00e9 chyb\u011bly u bal\u00ed\u010dk\u016f riscv64-elf-toolchain, versal-firmware a mxsldr, kter\u00e9 se standardn\u011b na\u010d\u00edtaly p\u0159es HTTPS, ale v p\u0159\u00edpad\u011b probl\u00e9m\u016f se p\u0159ep\u00ednaly na stahov\u00e1n\u00ed bez \u0161ifrov\u00e1n\u00ed z hostitele http:\/\/sources.buildroot.net. P\u0159i absenci soubor\u016f '.hash' n\u00e1stroj Buildroot pova\u017eoval ov\u011b\u0159en\u00ed za \u00fasp\u011b\u0161n\u00e9 a zpracov\u00e1val sta\u017een\u00e9 bal\u00ed\u010dky, v\u010detn\u011b aplikov\u00e1n\u00ed p\u0159\u00edchoz\u00edch patch\u016f a spou\u0161t\u011bn\u00ed buildovac\u00edch skript\u016f. S mo\u017enost\u00ed z\u00e1m\u011bny stahovan\u00fdch bal\u00ed\u010dk\u016f mohl \u00fato\u010dn\u00edk p\u0159idat do nich vlastn\u00ed patchy nebo buildovac\u00ed soubory Makefiles, co\u017e umo\u017enilo prov\u00e9st zm\u011bny v v\u00fdsledn\u00e9m obraze nebo skriptech buildovac\u00edho syst\u00e9mu a dos\u00e1hnout proveden\u00ed sv\u00e9ho k\u00f3du. <\/p>\n \u0160est\u00e1 zranitelnost (CVE-2023-43608) byla zp\u016fsobena chybou v implementaci funkce BR_NO_CHECK_HASH_FOR, kter\u00e1 umo\u017e\u0148uje vypnout ov\u011b\u0159ov\u00e1n\u00ed integrity podle hash\u016f pro vybran\u00e9 bal\u00ed\u010dky. N\u011bkter\u00e9 bal\u00ed\u010dky, jako nap\u0159\u00edklad j\u00e1dro Linux, U-Boot a versal-firmware, umo\u017enily stahov\u00e1n\u00ed posledn\u00edch verz\u00ed, pro kter\u00e9 je\u0161t\u011b nebyly zformov\u00e1ny ov\u011b\u0159ovac\u00ed hashe. Pro tyto verze byla pou\u017eita mo\u017enost BR_NO_CHECK_HASH_FOR, kter\u00e1 vyp\u00ednala hashovou kontrolu. Data byla stahov\u00e1na p\u0159es HTTPS, ale ve v\u00fdchoz\u00edm nastaven\u00ed se v p\u0159\u00edpad\u011b selh\u00e1n\u00ed stahov\u00e1n\u00ed p\u0159ech\u00e1zelo na p\u0159\u00edstup ke source.buildroot.net bez \u0161ifrov\u00e1n\u00ed p\u0159es protokol http:\/\/. \u00dato\u010dn\u00edk mohl b\u011bhem MITM \u00fatoku blokovat p\u0159ipojen\u00ed k HTTPS serveru a t\u00edm bylo stahov\u00e1n\u00ed vr\u00e1ceno na http:\/\/sources.buildroot.net. \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\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\udd47Zranitelnosti v Buildroot, kter\u00e9 umo\u017e\u0148uj\u00ed prov\u00e9st k\u00f3d na sestavovac\u00edm serveru prost\u0159ednictv\u00edm \u00fatoku MITM | ProHoster","description":"V syst\u00e9mu sestaven\u00ed Buildroot, zam\u011b\u0159en\u00e9m na vytv\u00e1\u0159en\u00ed spou\u0161t\u011bc\u00edch Linux prost\u0159ed\u00ed pro vestav\u011bn\u00e9 syst\u00e9my, bylo identifikov\u00e1no \u0161est zranitelnost\u00ed, 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"