{"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\/da\/blog\/news\/uyazvimosti-v-buildroot-pozvolyayushhie-cherez-mitm-ataku-vypolnit-kod-na-sborochnom-servere","title":{"rendered":"S\u00e5rbarheder i Buildroot, der g\u00f8r det muligt at udf\u00f8re kode p\u00e5 byggeserveren via en MITM-angreb","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I Buildroot-systemet, der er rettet mod at skabe bootable Linux-milj\u00f8er til indlejrede systemer, er der identificeret seks s\u00e5rbarheder, der g\u00f8r det muligt at \u00e6ndre de genererede systembilleder eller udf\u00f8re kode p\u00e5 byggeplatformen under interception af transittrafik (MITM). S\u00e5rbarhederne er blevet rettet i versionerne Buildroot 2023.02.8, 2023.08.4 og 2023.11. <\/p>\n

De f\u00f8rste fem s\u00e5rbarheder (CVE-2023-45841, CVE-2023-45842, CVE-2023-45838, CVE-2023-45839, CVE-2023-45840) p\u00e5virker koden til integritetskontrol af pakker baseret p\u00e5 hashes. Problemerne relaterer sig til muligheden for at bruge HTTP til at downloade filer og frav\u00e6ret af kontrol-hashfiler for nogle pakker, hvilket muligg\u00f8r \u00e6ndringer af indholdet af disse pakker, n\u00e5r man kan inds\u00e6tte sig i byggetrafikken. server<\/a> (for eksempel n\u00e5r en brugerconnecter via et tr\u00e5dl\u00f8st netv\u00e6rk, der kontrolleres af en angriber). <\/p>\n

Specifikt blev pakkerne aufs og aufs-util hentet via HTTP og blev ikke tjekket med hashes. Hashes manglede ogs\u00e5 for pakkerne riscv64-elf-toolchain, versal-firmware og mxsldr, som som standard blev hentet via HTTPS, men i tilf\u00e6lde af problemer faldt tilbage p\u00e5 at hente dem uden kryptering fra v\u00e6rten http:\/\/sources.buildroot.net. I mangel af filer '.hash' betragtede Buildroot-v\u00e6rkt\u00f8jet kontrollen som vellykket og behandlede de downloadede pakker, herunder anvendte indg\u00e5ende patches og k\u00f8rte bygge-scripts. Med muligheden for at \u00e6ndre de hentede pakker kunne en angriber tilf\u00f8je sine egne patches eller build-filer til Makefiles, hvilket gjorde det muligt at \u00e6ndre det resulterende billede eller build-system scripts og f\u00e5 sin kode til at blive udf\u00f8rt. <\/p>\n

Den sjette s\u00e5rbarhed (CVE-2023-43608) skyldes en fejl i implementeringen af funktionen BR_NO_CHECK_HASH_FOR, som g\u00f8r det muligt at deaktivere integritetskontrollen baseret p\u00e5 hashes for udvalgte pakker. Nogle pakker, som Linux-kernen, U-Boot og versal-firmware, tillod download af de nyeste versioner, for hvilke kontrol-hashes endnu ikke var blevet oprettet. For disse versioner blev indstillingen BR_NO_CHECK_HASH_FOR anvendt for at deaktivere hash-kontrol. Dataene blev downloadet via HTTPS, men som standard, i tilf\u00e6lde af downloadfejl, blev der rullet tilbage til adgang til source.buildroot.net uden kryptering via protokollen http:\/\/. Angriberen kunne under en MITM-angreb blokere forbindelsen til HTTPS-serveren, hvorefter download blev rullet tilbage til http:\/\/sources.buildroot.net.
\n
Kilde: 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\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\udd47S\u00e5rbarheder i Buildroot, der muligg\u00f8r udf\u00f8relse af kode p\u00e5 byggeserveren via MITM-angreb | ProHoster","description":"I Buildroot-systemen, som er rettet mod at skabe bootbare Linux-milj\u00f8er til indlejrede systemer, er der identificeret seks s\u00e5rbarheder, der muligg\u00f8r inddragelse under intercept 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