{"id":103242,"date":"2022-02-08T09:36:38","date_gmt":"2022-02-08T07:36:38","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-uefi-proshivkah-na-baze-frejmvorka-insydeh2o-pozvolyayushhie-vypolnit-kod-na-urovne-smm"},"modified":"2022-02-08T09:36:38","modified_gmt":"2022-02-08T07:36:38","slug":"uyazvimosti-v-uefi-proshivkah-na-baze-frejmvorka-insydeh2o-pozvolyayushhie-vypolnit-kod-na-urovne-smm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimosti-v-uefi-proshivkah-na-baze-frejmvorka-insydeh2o-pozvolyayushhie-vypolnit-kod-na-urovne-smm","title":{"rendered":"Zranitelnosti v UEFI firmwaru na b\u00e1zi frameworku InsydeH2O umo\u017e\u0148uj\u00edc\u00ed spu\u0161t\u011bn\u00ed k\u00f3du na \u00farovni SMM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ve frameworku InsydeH2O, kter\u00fd pou\u017e\u00edv\u00e1 mnoho v\u00fdrobc\u016f k vytv\u00e1\u0159en\u00ed UEFI firmwaru pro svou techniku (nej\u010dast\u011bj\u0161\u00ed realizace UEFI BIOS), byly nalezeny 23 zranitelnosti, kter\u00e9 umo\u017e\u0148uj\u00ed vykon\u00e1v\u00e1n\u00ed k\u00f3du na \u00farovni SMM (System Management Mode), kter\u00e1 m\u00e1 vy\u0161\u0161\u00ed prioritu (Ring -2) ne\u017e hypervizor a nulov\u00fd ochrann\u00fd krou\u017eek, a tedy m\u00e1 neomezen\u00fd p\u0159\u00edstup k cel\u00e9 pam\u011bti. Tento probl\u00e9m se t\u00fdk\u00e1 UEFI firmware pou\u017e\u00edvan\u00e9ho v\u00fdrobci jako Fujitsu, Siemens, Dell, HP, HPE, Lenovo, Microsoft, Intel a Bull Atos.    <\/p>\n<p>K vyu\u017eit\u00ed t\u011bchto zranitelnost\u00ed je zapot\u0159eb\u00ed m\u00edstn\u00ed p\u0159\u00edstup s pr\u00e1vy administr\u00e1tora, co\u017e \u010din\u00ed tyto probl\u00e9my atraktivn\u00edmi jako druhotn\u00e9 zranitelnosti, kter\u00e9 se vyu\u017e\u00edvaj\u00ed po exploataci jin\u00fdch zranitelnost\u00ed v syst\u00e9mu nebo vyu\u017eit\u00edm metod soci\u00e1ln\u00edho in\u017een\u00fdrstv\u00ed. P\u0159\u00edstup na \u00farovni SMM umo\u017e\u0148uje vykon\u00e1vat k\u00f3d na \u00farovni, kter\u00e1 nen\u00ed pod kontrolou opera\u010dn\u00edho syst\u00e9mu, co\u017e m\u016f\u017ee b\u00fdt vyu\u017eito k modifikaci firmwaru a zanech\u00e1n\u00ed skryt\u00e9ho malwaru nebo rootkit\u016f v SPI Flash, kter\u00e9 nejsou detekovateln\u00e9 opera\u010dn\u00edm syst\u00e9mem, a tak\u00e9 k deaktivaci verifikace b\u011bhem spou\u0161t\u011bn\u00ed (UEFI Secure Boot, Intel BootGuard) a \u00fatok\u016fm na hypervizory za \u00fa\u010delem obch\u00e1zen\u00ed mechanism\u016f pro ov\u011b\u0159ov\u00e1n\u00ed integrity virtu\u00e1ln\u00edch prost\u0159ed\u00ed.  <center><img decoding=\"async\" alt=\"Zranitelnosti v UEFI firmwaru na b\u00e1zi frameworku InsydeH2O umo\u017e\u0148uj\u00edc\u00ed spu\u0161t\u011bn\u00ed k\u00f3du na \u00farovni SMM\" src=\"\/wp-content\/uploads\/2022\/02\/dcf918bee3be0d2788f82d325cd671c7.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Exploataci zranitelnost\u00ed lze prov\u00e9st z opera\u010dn\u00edho syst\u00e9mu pomoc\u00ed neov\u011b\u0159en\u00fdch SMI zpracovatel\u016f (System Management Interrupt), stejn\u011b jako v dob\u011b p\u0159ed spu\u0161t\u011bn\u00edm opera\u010dn\u00edho syst\u00e9mu b\u011bhem po\u010d\u00e1te\u010dn\u00edch f\u00e1z\u00ed spou\u0161t\u011bn\u00ed nebo n\u00e1vratu ze sp\u00e1nkov\u00e9ho re\u017eimu. V\u0161echny zranitelnosti jsou zp\u016fsobeny probl\u00e9my s pam\u011bt\u00ed a jsou rozd\u011bleny do t\u0159\u00ed kategori\u00ed:   <\/p>\n<ul>\n<li class=\"l\"> SMM Callout \u2014 prov\u00e1d\u011bn\u00ed vlastn\u00edho k\u00f3du s pr\u00e1vy SMM prost\u0159ednictv\u00edm p\u0159esm\u011brov\u00e1n\u00ed zpracov\u00e1n\u00ed p\u0159eru\u0161en\u00ed SWSMI na k\u00f3d mimo SMRAM;\n<li class=\"l\"> Po\u0161kozen\u00ed pam\u011bti, kter\u00e9 umo\u017e\u0148uje \u00fato\u010dn\u00edkovi zapsat sv\u00e1 data do SMRAM, speci\u00e1ln\u00ed izolovan\u00e9 oblasti pam\u011bti, ve kter\u00e9 se vykon\u00e1v\u00e1 k\u00f3d s pr\u00e1vy SMM.\n<li class=\"l\"> Po\u0161kozen\u00ed pam\u011bti v k\u00f3du, kter\u00fd se vykon\u00e1v\u00e1 na \u00farovni DXE (Driver eXecution Environment).  <\/ul>\n<p>Pro demonstraci princip\u016f organizace \u00fatoku byl publikov\u00e1n p\u0159\u00edklad exploit, kter\u00fd umo\u017e\u0148uje z\u00edskat p\u0159\u00edstup k DXE Runtime UEFI a vykonat sv\u016fj k\u00f3d prost\u0159ednictv\u00edm \u00fatoku z t\u0159et\u00edho nebo nulov\u00e9ho ochrann\u00e9ho kruhu. Exploit manipuluje s p\u0159ete\u010den\u00edm z\u00e1sobn\u00edku (CVE-2021-42059) v ovlada\u010di UEFI DXE. B\u011bhem \u00fatoku m\u016f\u017ee \u00fato\u010dn\u00edk vlo\u017eit sv\u016fj k\u00f3d do DXE ovlada\u010de, kter\u00fd si uchov\u00e1 aktivitu po restartu opera\u010dn\u00edho syst\u00e9mu, nebo prov\u00e9st zm\u011bny v oblasti NVRAM v SPI Flash. B\u011bhem prov\u00e1d\u011bn\u00ed m\u016f\u017ee \u00fato\u010dn\u00edk\u016fv k\u00f3d m\u011bnit privilegovan\u00e9 oblasti pam\u011bti, modifikovat slu\u017eby EFI Runtime a ovlivnit proces bootov\u00e1n\u00ed.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56656\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a\u0435 InsydeH2O, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u043c\u043d\u043e\u0433\u0438\u043c\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044f\u043c\u0438 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f UEFI-\u043f\u0440\u043e\u0448\u0438\u0432\u043e\u043a \u043a \u0441\u0432\u043e\u0435\u043c\u0443 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044e (\u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0451\u043d\u043d\u0430\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f UEFI BIOS), \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b 23 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 SMM (System Management Mode), \u0431\u043e\u043b\u0435\u0435 \u043f\u0440\u0438\u043e\u0440\u0438\u0442\u0435\u0442\u043d\u043e\u043c (Ring -2), \u0447\u0435\u043c \u0440\u0435\u0436\u0438\u043c \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 \u0438 \u043d\u0443\u043b\u0435\u0432\u043e\u0435 \u043a\u043e\u043b\u044c\u0446\u043e \u0437\u0430\u0449\u0438\u0442\u044b, \u0438 \u0438\u043c\u0435\u044e\u0449\u0438\u043c \u043d\u0435\u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a\u043e \u0432\u0441\u0435\u0439 \u043f\u0430\u043c\u044f\u0442\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 UEFI-\u043f\u0440\u043e\u0448\u0438\u0432\u043a\u0438, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0435 \u0442\u0430\u043a\u0438\u043c\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044f\u043c\u0438, \u043a\u0430\u043a Fujitsu, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103243,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103242","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a\u0435 InsydeH2O, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u043c\u043d\u043e\u0433\u0438\u043c\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044f\u043c\u0438 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f UEFI-\u043f\u0440\u043e\u0448\u0438\u0432\u043e\u043a \u043a \u0441\u0432\u043e\u0435\u043c\u0443 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