{"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\/sk\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-obojti-ogranicheniya-rezhima-lockdown","title":{"rendered":"Zranite\u013enos\u0165 v jadre Linuxu, ktor\u00e1 umo\u017e\u0148uje ob\u00eds\u0165 obmedzenia re\u017eimu Lockdown","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V jadre Linux bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2022-21505), ktor\u00e1 umo\u017e\u0148uje \u013eahko ob\u00eds\u0165 ochrann\u00fd mechanizmus Lockdown, ktor\u00fd obmedzuje pr\u00edstup pou\u017e\u00edvate\u013ea root k jadru a blokuje obch\u00e1dzacie cesty UEFI Secure Boot. Na ob\u00eddenie sa navrhuje pou\u017ei\u0165 subsyst\u00e9m jadra IMA (Integrity Measurement Architecture), ur\u010den\u00fd na overovanie integrity komponentov opera\u010dn\u00e9ho syst\u00e9mu pomocou digit\u00e1lnych podpisov a hashov. <\/p>\n

V re\u017eime lockdown je obmedzen\u00fd pr\u00edstup k \/dev\/mem, \/dev\/kmem, \/dev\/port, \/proc\/kcore, debugfs, ladeniu pomocou kprobes, mmiotrace, tracefs, BPF, PCMCIA CIS (Card Information Structure), niektor\u00fdm rozhraniam ACPI a CPU MSR registr\u00e1m, blokovan\u00e9 s\u00fa volania kexec_file a kexec_load, zak\u00e1zan\u00fd je prechod do sp\u00e1nkov\u00e9ho re\u017eimu, obmedzen\u00e9 je pou\u017e\u00edvanie DMA pre PCI zariadenia, zak\u00e1zan\u00fd je import ACPI k\u00f3du z EFI premenn\u00fdch, manipul\u00e1cie s portmi vstupu\/v\u00fdstupu ako aj zmena \u010d\u00edsla preru\u0161enia a portu vstupu\/v\u00fdstupu pre s\u00e9riov\u00fd port s\u00fa nepr\u00edpustn\u00e9. <\/p>\n

Podstata zranite\u013enosti spo\u010d\u00edva v tom, \u017ee pri pou\u017eit\u00ed zav\u00e1dzacieho parametra \u201eima_appraise=log\u201c je mo\u017en\u00e9 zavola\u0165 kexec na na\u010d\u00edtanie novej k\u00f3pie jadra, ak nie je v syst\u00e9me aktivovan\u00fd re\u017eim Secure Boot a re\u017eim Lockdown sa pou\u017e\u00edva oddelene od neho. IMA neumo\u017e\u0148uje aktiv\u00e1ciu re\u017eimu \u201eima_appraise\u201c pri akt\u00edvnom Secure Boot, ale nezoh\u013ead\u0148uje mo\u017enos\u0165 pou\u017e\u00edvania Lockdown oddelene od Secure Boot.
\n
Zdroj: 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\udd47Zranite\u013enos\u0165 v jadre Linux, ktor\u00e1 umo\u017e\u0148uje ob\u00eds\u0165 obmedzenia re\u017eimu Lockdown | ProHoster","description":"V jadre Linux bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2022-21505), ktor\u00e1 umo\u017e\u0148uje \u013eahko ob\u00eds\u0165 ochrann\u00fd mechanizmus Lockdown, ktor\u00fd obmedzuje pr\u00edstup pou\u017e\u00edvate\u013ea root k jadru a blokuje obch\u00e1dzacie cesty UEFI 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