{"id":104680,"date":"2022-07-21T09:36:51","date_gmt":"2022-07-21T07:36:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-yadre-linux-pozvolyayushhaya-obojti-ogranicheniya-rezhima-lockdown"},"modified":"2022-07-21T09:36:51","modified_gmt":"2022-07-21T07:36:51","slug":"uyazvimost-v-yadre-linux-pozvolyayushhaya-obojti-ogranicheniya-rezhima-lockdown","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-obojti-ogranicheniya-rezhima-lockdown","title":{"rendered":"S\u00e5rbarhed i Linux-kernen, der muligg\u00f8r omg\u00e5else af Lockdown-tilstandens begr\u00e6nsninger","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En s\u00e5rbarhed er blevet opdaget i Linux-kernen (CVE-2022-21505), som nemt kan omg\u00e5 Lockdown-besky mekanismen, der begr\u00e6nser root-brugerens adgang til kernen og blokkerer omg\u00e5elsesveje til UEFI Secure Boot. For at omg\u00e5 dette foresl\u00e5s det at bruge kernen IMA (Integrity Measurement Architecture), der er designet til at kontrollere integriteten af operativsystemkomponenter ved hj\u00e6lp af digitale signaturer og hash-funktioner. <\/p>\n

I Lockdown-tilstanden begr\u00e6nses adgangen til \/dev\/mem, \/dev\/kmem, \/dev\/port, \/proc\/kcore, debugfs, kprobes-debugging, mmiotrace, tracefs, BPF, PCMCIA CIS (Card Information Structure), visse ACPI-gr\u00e6nseflader og MSR-registre p\u00e5 CPU'en, kald til kexec_file og kexec_load blokeres, overgangen til dvaletilstand forbydes, DMA-brugen for PCI-enheder begr\u00e6nses, import af ACPI-kode fra EFI-variabler tillades ikke, og manipulation med ind- og udgange, herunder \u00e6ndring af IRQ-nummer og input\/output-port for den serielle port, er ikke tilladt. <\/p>\n

Vulnerabilityens essens er, at ved brug af bootparameteren \"ima_appraise=log\" er det muligt at udf\u00f8re kexec for at indl\u00e6se en ny kopi af kernen, hvis Secure Boot-tilstanden ikke er aktiv, og Lockdown-tilstanden anvendes separat. IMA tillader ikke aktivering af \"ima_appraise\"-tilstanden, n\u00e5r Secure Boot er aktiv, men tager ikke h\u00f8jde for muligheden for at bruge Lockdown uafh\u00e6ngigt af Secure Boot.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-21505), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u0435\u0433\u043a\u043e \u043e\u0431\u043e\u0439\u0442\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0437\u0430\u0449\u0438\u0442\u044b Lockdown, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u0435\u0442 \u0434\u043e\u0441\u0442\u0443\u043f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f root \u043a \u044f\u0434\u0440\u0443 \u0438 \u0431\u043b\u043e\u043a\u0438\u0440\u0443\u0435\u0442 \u043f\u0443\u0442\u0438 \u043e\u0431\u0445\u043e\u0434\u0430 UEFI Secure Boot. \u0414\u043b\u044f \u043e\u0431\u0445\u043e\u0434\u0430 \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u0435\u0442\u0441\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0443 \u044f\u0434\u0440\u0430 IMA (Integrity Measurement Architecture), \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u0443\u044e \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u0438 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u043e\u0432 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u043e \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u043c \u043f\u043e\u0434\u043f\u0438\u0441\u044f\u043c \u0438 \u0445\u044d\u0448\u0430\u043c. \u0412 \u0440\u0435\u0436\u0438\u043c\u0435 lockdown \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0434\u043e\u0441\u0442\u0443\u043f \u043a \/dev\/mem, […]<\/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-104680","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\u00e5rbarhed i Linux-kernen, der muligg\u00f8r omg\u00e5else af Lockdown-tilstandens begr\u00e6nsninger | ProHoster","description":"En s\u00e5rbarhed er blevet opdaget i Linux-kernen (CVE-2022-21505), som nemt kan omg\u00e5 Lockdown-besky mekanismen, der begr\u00e6nser root-brugerens adgang til kernen og blokkerer omg\u00e5elsesveje til UEFI Secure 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