Bola odhalen\u00e1 zranite\u013enos\u0165 (CVE-2023-4001) v z\u00e1plat\u00e1ch bootloaderu GRUB2, ktor\u00e9 pripravila spolo\u010dnos\u0165 Red Hat. Zranite\u013enos\u0165 umo\u017e\u0148uje na mnoh\u00fdch syst\u00e9moch s UEFI ob\u00eds\u0165 kontrolu hesla nastaven\u00e9ho v GRUB2 na obmedzenie pr\u00edstupu k bootovaciemu menu alebo pr\u00edkazov\u00e9mu riadku bootloadera. Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 zmenou pridanou spolo\u010dnos\u0165ou Red Hat do bal\u00edka GRUB2 dod\u00e1van\u00e9ho v RHEL a Fedora Linux. Probl\u00e9m sa neprejavuje v hlavnom projekte GRUB2 a t\u00fdka sa iba distrib\u00faci\u00ed, ktor\u00e9 aplikovali \u010fal\u0161ie z\u00e1platy od spolo\u010dnosti Red Hat. <\/p>\n
Probl\u00e9m je sp\u00f4soben\u00fd chybou v logike pou\u017e\u00edvania UUID pri h\u013eadan\u00ed bootloaderom zariadenia s konfigura\u010dn\u00fdm s\u00faborom (napr\u00edklad «\\\/boot\\\/efi\\\/EFI\\\/fedora\\\/grub.cfg»), ktor\u00fd obsahuje hash hesla. Na ob\u00eddenie autentifik\u00e1cie m\u00f4\u017ee pou\u017e\u00edvate\u013e, ktor\u00fd m\u00e1 fyzick\u00fd pr\u00edstup k po\u010d\u00edta\u010du, pripoji\u0165 extern\u00fd \u00falo\u017en\u00fd disk, ako je USB Flash, a priradi\u0165 mu UUID, ktor\u00fd opakuje identifik\u00e1tor bootovacej partition\\\/boot napadnutej syst\u00e9mu. <\/p>\n
Mnoh\u00e9 UEFI syst\u00e9my spracov\u00e1vaj\u00fa extern\u00e9 \u00falo\u017en\u00e9 disky prednostne a zaradia ich do zoznamu objaven\u00fdch zariaden\u00ed pred stacion\u00e1rnymi \u00falo\u017eiskami, preto bude pri spracovan\u00ed prioritnej\u0161\u00ed partition \\\/boot pripraven\u00fd \u00fato\u010dn\u00edkom a z tohto partition sa GRUB2 pok\u00fasi na\u010d\u00edta\u0165 konfigura\u010dn\u00fd s\u00fabor. Pri h\u013eadan\u00ed partition pomocou pr\u00edkazu «search» v GRUB2 sa ur\u010d\u00ed iba prv\u00e9 zhodovanie UUID, po \u010dom sa h\u013eadanie ukon\u010d\u00ed. Ak v danom partition hlavn\u00fd konfigura\u010dn\u00fd s\u00fabor nen\u00e1jde, GRUB2 zobraz\u00ed pr\u00edkazov\u00fd riadok, ktor\u00fd umo\u017e\u0148uje \u00faplne ovl\u00e1da\u0165 \u010fal\u0161\u00ed proces sp\u00fa\u0161\u0165ania. <\/p>\n
Na ur\u010denie UUID partition m\u00f4\u017ee lok\u00e1lny nepriviligovan\u00fd pou\u017e\u00edvate\u013e pou\u017ei\u0165 n\u00e1stroj «lsblk», no cudz\u00ed pou\u017e\u00edvate\u013e, ktor\u00fd nem\u00e1 pr\u00edstup k syst\u00e9mu, ale dok\u00e1\u017ee sledova\u0165 proces sp\u00fa\u0161\u0165ania, m\u00f4\u017ee v niektor\u00fdch distrib\u00faci\u00e1ch ur\u010di\u0165 UUID z diagnostick\u00fdch spr\u00e1v zobrazen\u00fdch po\u010das sp\u00fa\u0161\u0165ania. Zranite\u013enos\u0165 bola odstr\u00e1nen\u00e1 Red Hat pridan\u00edm nov\u00e9ho argumentu k pr\u00edkazu «search», ktor\u00fd umo\u017e\u0148uje viaza\u0165 oper\u00e1ciu skenovania UUID iba na blokov\u00e9 zariadenia pou\u017e\u00edvan\u00e9 na sp\u00fa\u0161\u0165anie boot managera (t.j. partition \\\/boot mus\u00ed by\u0165 na tom istom disku ako syst\u00e9mov\u00e1 partition EFI). \u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-4001) \u0432 \u043f\u0430\u0442\u0447\u0430\u0445 \u043a \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0443 GRUB2, \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Red Hat. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043d\u0430 \u043c\u043d\u043e\u0433\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 UEFI \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443 \u043f\u0430\u0440\u043e\u043b\u044f, \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0432 GRUB2 \u0434\u043b\u044f \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0437\u0430\u0433\u0440\u0443\u0437\u043e\u0447\u043d\u043e\u043c\u0443 \u043c\u0435\u043d\u044e \u0438\u043b\u0438 \u043a\u043e\u043c\u0430\u043d\u0434\u043d\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435\u043c, \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u043c \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Red Hat \u0432 \u043f\u0430\u043a\u0435\u0442 \u0441 GRUB2, \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u044b\u0439 \u0432 RHEL \u0438 Fedora Linux. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 […]<\/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-112924","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 z\u00e1plat\u00e1ch Red Hat pre bootloader GRUB2, ktor\u00e1 umo\u017e\u0148uje ob\u00eds\u0165 overenie hesla | ProHoster","description":"Bola odhalen\u00e1 zranite\u013enos\u0165 (CVE-2023-4001) v z\u00e1plat\u00e1ch pre bootloader GRUB2, ktor\u00e9 pripravila spolo\u010dnos\u0165 Red Hat.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-patchah-red-hat-k-zagruzchiku-grub2-pozvolyayushhaya-obojti-proverku-parolya","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","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 \u043f\u0430\u0442\u0447\u0430\u0445 Red Hat \u043a \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0443 GRUB2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443 \u043f\u0430\u0440\u043e\u043b\u044f | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-4001) \u0432 \u043f\u0430\u0442\u0447\u0430\u0445 \u043a \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0443 GRUB2, \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Red Hat.","og:url":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-patchah-red-hat-k-zagruzchiku-grub2-pozvolyayushhaya-obojti-proverku-parolya","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":"2024-01-15T15:28:03+00:00","article:modified_time":"2024-01-15T15:28:03+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts\/112924","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/comments?post=112924"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts\/112924\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/media?parent=112924"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/categories?post=112924"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/tags?post=112924"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"