{"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\/pl\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-obojti-ogranicheniya-rezhima-lockdown","title":{"rendered":"Vulnerability w j\u0105drze Linux, umo\u017cliwiaj\u0105ca omini\u0119cie ogranicze\u0144 trybu Lockdown","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W j\u0105drze Linux zidentyfikowano podatno\u015b\u0107 (CVE-2022-21505), kt\u00f3ra umo\u017cliwia \u0142atwe omini\u0119cie mechanizmu zabezpiecze\u0144 Lockdown, ograniczaj\u0105cego dost\u0119p u\u017cytkownika root do j\u0105dra oraz blokuj\u0105cego drogi omini\u0119cia UEFI Secure Boot. Aby to obej\u015b\u0107, proponuje si\u0119 wykorzystanie podsystemu j\u0105dra IMA (Integrity Measurement Architecture), zaprojektowanego do sprawdzania integralno\u015bci komponent\u00f3w systemu operacyjnego za pomoc\u0105 podpis\u00f3w cyfrowych i skr\u00f3t\u00f3w. <\/p>\n

W trybie lockdown ogranicza si\u0119 dost\u0119p do \/dev\/mem, \/dev\/kmem, \/dev\/port, \/proc\/kcore, debugfs, trybu debugowania kprobes, mmiotrace, tracefs, BPF, ACPI CIS (Card Information Structure), niekt\u00f3rych interfejs\u00f3w ACPI oraz rejestrom MSR CPU. Blokowane s\u0105 wywo\u0142ania kexec_file i kexec_load, zabrania si\u0119 przechodzenia w tryb u\u015bpienia, ogranicza si\u0119 u\u017cycie DMA dla urz\u0105dze\u0144 PCI, zabrania si\u0119 importu kodu ACPI z zmiennych EFI, a tak\u017ce manipulacji z portami wej\u015bcia\/wyj\u015bcia, w tym zmiany numeru przerwania i portu wej\u015bcia\/wyj\u015bcia dla portu szeregowego. <\/p>\n

Istota luki bezpiecze\u0144stwa polega na tym, \u017ce przy u\u017cywaniu parametru startowego «ima_appraise=log», mo\u017cliwe jest wywo\u0142anie kexec w celu za\u0142adowania nowej kopii j\u0105dra, je\u015bli w systemie nie jest w\u0142\u0105czony tryb Secure Boot, a tryb Lockdown jest u\u017cywany niezale\u017cnie od niego. IMA nie zezwala na w\u0142\u0105czenie trybu «ima_appraise» przy aktywnym Secure Boot, ale nie uwzgl\u0119dnia mo\u017cliwo\u015bci u\u017cycia Lockdown oddzielnie od Secure Boot.
\n
\u0179r\u00f3d\u0142o: 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\udd47Podatno\u015b\u0107 w j\u0105drze Linux, umo\u017cliwiaj\u0105ca omini\u0119cie ogranicze\u0144 trybu Lockdown | ProHoster","description":"W j\u0105drze Linux zidentyfikowano podatno\u015b\u0107 (CVE-2022-21505), kt\u00f3ra umo\u017cliwia \u0142atwe omini\u0119cie mechanizmu zabezpiecze\u0144 Lockdown, ograniczaj\u0105cego dost\u0119p u\u017cytkownika root do j\u0105dra oraz blokuj\u0105cego drogi omini\u0119cia UEFI Secure Boot.","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-obojti-ogranicheniya-rezhima-lockdown","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pl_PL","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\u044c \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0431\u043e\u0439\u0442\u0438 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0440\u0435\u0436\u0438\u043c\u0430 Lockdown | ProHoster","og:description":"\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.","og:url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-obojti-ogranicheniya-rezhima-lockdown","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2022-07-21T07:36:51+00:00","article:modified_time":"2022-07-21T07:36:51+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"104680","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2022-07-21 07:37:49","updated":"2022-09-28 19:29:04","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts\/104680","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/comments?post=104680"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts\/104680\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/media?parent=104680"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/categories?post=104680"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/tags?post=104680"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}