{"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\/et\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-obojti-ogranicheniya-rezhima-lockdown","title":{"rendered":"Linuxi s\u00fcdamikus on haavatavus, mis v\u00f5imaldab v\u00e4ltida Lockdown re\u017eiimi piiranguid.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linuxi tuumas avastati n\u00f5rkus (CVE-2022-21505), mis v\u00f5imaldab h\u00f5lpsasti \u00fcletada Lockdown kaitses\u00fcsteemi, mis piirab root-kasutaja juurdep\u00e4\u00e4su tuumale ja blokeerib UEFI Secure Boot \u00fcmbers\u00f5iduteed. \u00dcmberminekuks soovitatakse kasutada IMA (Integrity Measurement Architecture) tuuma alamprogrammi, mis on m\u00f5eldud operatsioonis\u00fcsteemi komponentide terviklikkuse kontrollimiseks digiallkirjade ja r\u00e4sihade alusel. <\/p>\n

Lockdown-re\u017eiimis piiratakse juurdep\u00e4\u00e4su \/dev\/mem, \/dev\/kmem, \/dev\/port, \/proc\/kcore, debugfs, kprobes'i silumisre\u017eiimile, mmiotrace, tracefs, BPF, PCMCIA CIS (Card Information Structure), teatud ACPI liideste ja CPU MSR registeride juurde, v\u00f5etakse kasutusele kexec_file ja kexec_load kutsed, keelatakse unere\u017eiimi \u00fcleminek, piiratakse DMA kasutamist PCI seadmete jaoks, keelatakse ACPI koodi import EFI muutujatest, ei lubata sisend-\/v\u00e4ljundportidega manipuleerimist, sealhulgas katkestuste ja sisend-\/v\u00e4ljundportide muutmist serial port'i jaoks. <\/p>\n

Haavatavuse olemus on see, et k\u00e4ivitusparameetri 'ima_appraise=log' kasutamisel on v\u00f5imalik kutsuda k\u00e4ivitust kexec uue tuuma koopia laadimiseks, kui s\u00fcsteemis ei ole aktiivne Secure Boot re\u017eiim ning re\u017eiimi Lockdown kasutatakse eraldi sellest. IMA ei luba re\u017eiimi 'ima_appraise' aktiveerimist, kui Secure Boot on aktiivne, kuid ei arvestata Lockdowni kasutamise v\u00f5imalust eraldi Secure Boot'ist.
\n
Allikas: 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\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\udd47N\u00f5rkus Linuxi tuumas, mis v\u00f5imaldab \u00fcletada Lockdown re\u017eiimi piiranguid | ProHoster","description":"Linuxi tuumas avastati n\u00f5rkus (CVE-2022-21505), mis v\u00f5imaldab h\u00f5lpsasti \u00fcletada Lockdown kaitses\u00fcsteemi, mis piirab root-kasutaja juurdep\u00e4\u00e4su tuumale ja blokeerib UEFI Secure Boot 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