{"id":104320,"date":"2022-06-08T15:36:43","date_gmt":"2022-06-08T13:36:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-grub2-pozvolyayushhie-obojti-uefi-secure-boot"},"modified":"2022-06-08T15:36:43","modified_gmt":"2022-06-08T13:36:43","slug":"uyazvimosti-v-grub2-pozvolyayushhie-obojti-uefi-secure-boot","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimosti-v-grub2-pozvolyayushhie-obojti-uefi-secure-boot","title":{"rendered":"S\u00e5rbarheder i GRUB2, der muligg\u00f8r omg\u00e5else af UEFI Secure Boot","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Syv s\u00e5rbarheder er blevet rettet i GRUB2 bootloaderen, som muligg\u00f8r omg\u00e5else af UEFI Secure Boot og f\u00e5r ikke-valideret kode til at k\u00f8re, for eksempel ved at integrere malware, der fungerer p\u00e5 niveau med bootloaderen eller kernen. Der n\u00e6vnes desuden en s\u00e5rbarhed i shim-laget, som ogs\u00e5 tillader omg\u00e5else af UEFI Secure Boot. Gruppen af s\u00e5rbarheder har f\u00e5et kodeordet Boothole 3, ligesom tidligere lignende problemer opdaget i bootloaderen.      <\/p>\n<p>For at l\u00f8se problemerne i GRUB2 og shim kan distributioner anvende SBAT-mekanismen (UEFI Secure Boot Advanced Targeting), som underst\u00f8ttes i GRUB2, shim og fwupd. SBAT er udviklet i samarbejde med Microsoft og indeb\u00e6rer tilf\u00f8jelse af metadata til de eksekverbare filer af UEFI-komponenter, der indeholder oplysninger om producent, produkt, komponent og version. De n\u00e6vnte metadata signeres digitalt og kan separat inkluderes i lister over tilladte eller forbudte komponenter til UEFI Secure Boot.      <\/p>\n<p>I de fleste Linux-distributioner anvendes et lille shim-lag, der er digitalt signeret af Microsoft, til verificeret boot i UEFI Secure Boot-tilstand. Dette lag verificerer GRUB2 med sit eget certifikat, hvilket g\u00f8r det muligt for distributionsudviklere ikke at skulle signere hver opdatering af kernen og GRUB i Microsoft. S\u00e5rbarheder i GRUB2 tillader eksekvering af egen kode efter en vellykket verifikation af shim, men f\u00f8r operativsystemet er indl\u00e6st, ved at tr\u00e6nge ind i tillidsk\u00e6den under aktiv Secure Boot-tilstand og f\u00e5 fuld kontrol over den fortsatte bootproces, herunder nedl\u00e6sning af et andet OS, \u00e6ndring af komponenter i operativsystemet og omg\u00e5else af Lockdown-beskyttelsen.       <\/p>\n<p>For at l\u00f8se problemerne i bootloaderen m\u00e5 distributioner skabe nye interne digitale signaturer og opdatere installat\u00f8rer, bootloadere, kernepakker, fwupd-firmware og shim-laget. F\u00f8r implementeringen af SBAT var opdatering af listen over tilbagekaldte certifikater (dbx, UEFI Revocation List) en foruds\u00e6tning for fuldst\u00e6ndig at blokere s\u00e5rbarheden, da angriberen, uanset hvilket operativsystem der anvendes, kunne kompromittere UEFI Secure Boot ved at bruge et bootmedie med en gammel s\u00e5rbar version af GRUB2, der var digitalt signeret.     <\/p>\n<p>I stedet for at tilbagekalde signaturen tillader SBAT at blokere dens anvendelse for specifikke versionsnumre af komponenter uden at skulle tilbagekalde n\u00f8glerne til Secure Boot. Blokering af s\u00e5rbarheder via SBAT kr\u00e6ver ikke brug af listen over tilbagekaldte UEFI-certifikater (dbx), og sker p\u00e5 niveauet for udskiftning af den interne n\u00f8gle til dannelse af signaturer samt opdatering af GRUB2, shim og andre leverede distributionsboot artefakter. I \u00f8jeblikket er SBAT-support allerede tilf\u00f8jet i de fleste popul\u00e6re Linux-distributioner.      <\/p>\n<p>Identificerede s\u00e5rbarheder:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2021-3696, CVE-2021-3695 - buffer overflow i heap'en ved behandling af specielt udformede PNG-billeder, som teoretisk kan udnyttes til at udf\u00f8re ondsindet kode og omg\u00e5 UEFI Secure Boot. Det bem\u00e6rkes, at problemet er vanskeligt at udnytte, da der kr\u00e6ves en r\u00e6kke faktorer og kendskab til hukommelseslayoutet for at skabe en fungerende exploit.\n<li class=\"l\"> CVE-2021-3697 - buffer underflow i koden til behandling af JPEG-billeder. Udnyttelse af problemet kr\u00e6ver viden om hukommelseslayoutet og ligger p\u00e5 samme kompleksitetsniveau som PNG-problemet (CVSS 7.5).\n<li class=\"l\"> CVE-2022-28733 \u2014 heltals overflow i funktionen grub_net_recv_ip4_packets(), der muligg\u00f8r at p\u00e5virke parameteret rsm-&gt;total_len ved at sende en specifikt udformet IP-pakke. Problemet er markeret som den mest kritiske blandt de pr\u00e6senterede s\u00e5rbarheder (CVSS 8.1). Ved succesfuld udnyttelse tillader s\u00e5rbarheden at skrive data uden for buffergr\u00e6nsen ved at allokere en betydeligt mindre m\u00e6ngde hukommelse.\n<li class=\"l\"> CVE-2022-28734 \u2014 enkelt-byte buffer overflow ved behandling af adskilte HTTP-overskrifter. Problemet kan f\u00f8re til beskadigelse af GRUB2-metadata (gemme en nul-byte umiddelbart efter bufferens slut) ved parsing af specifikt udformede HTTP-anmodninger.\n<li class=\"l\"> CVE-2022-28735 \u2014 et problem i shim_lock-verifikatoren, der g\u00f8r det muligt at indl\u00e6se filer, der ikke tilh\u00f8rer kernen. S\u00e5rbarheden kan bruges til at indl\u00e6se uunderskrevne kernelmoduler eller ikke-verificeret kode i UEFI Secure Boot-tilstand.\n<li class=\"l\"> CVE-2022-28736 \u2014 adgang til allerede frigivet hukommelse i funktionen grub_cmd_chainloader() ved genstart af chainloader-kommandoen, der bruges til at indl\u00e6se operativsystemer, der ikke underst\u00f8ttes i GRUB2. Udnyttelse kan f\u00f8re til eksekvering af angriberens kode, hvis angriberen kan bestemme hukommelsesfordelingsm\u00f8nstrene i GRUB2.\n<li class=\"l\"> CVE-2022-28737 \u2014 buffer overflow i shim-laget, der opst\u00e5r i funktionen handle_image() under indl\u00e6sning og eksekvering af specifikt udformede EFI-billeder.          <\/ul>\n<p>Kilde: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57316\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0435 GRUB2 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e 7 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043e\u0431\u043e\u0439\u0442\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c UEFI Secure Boot \u0438 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u043d\u0435\u0432\u0435\u0440\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0438\u0442\u044c \u0432\u043d\u0435\u0434\u0440\u0435\u043d\u0438\u0435 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u0433\u043e \u041f\u041e, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0435\u0433\u043e \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0430 \u0438\u043b\u0438 \u044f\u0434\u0440\u0430. \u0414\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f \u043e\u0434\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0435 shim, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043e\u0431\u043e\u0439\u0442\u0438 UEFI Secure Boot. \u0413\u0440\u0443\u043f\u043f\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Boothole 3, \u043f\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0438 \u0441 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u043c\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438, \u0440\u0430\u043d\u0435\u0435 [&hellip;]<\/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-104320","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0435 GRUB2 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e 7 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043e\u0431\u043e\u0439\u0442\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c UEFI Secure Boot \u0438 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0437\u0430\u043f\u0443\u0441\u043a\u0430 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muligg\u00f8r k\u00f8rsel af ikke-valideret kode, f.eks. infiltration af malware, der k\u00f8rer p\u00e5 bootloader-niveau.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimosti-v-grub2-pozvolyayushhie-obojti-uefi-secure-boot","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","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 GRUB2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043e\u0431\u043e\u0439\u0442\u0438 UEFI Secure Boot | ProHoster","og:description":"\u0412 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