{"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\/hu\/blog\/news\/uyazvimosti-v-uefi-proshivkah-na-baze-frejmvorka-insydeh2o-pozvolyayushhie-vypolnit-kod-na-urovne-smm","title":{"rendered":"Az InsydeH2O keretrendszeren alapul\u00f3 UEFI firmware-sebezhet\u0151s\u00e9gek, amelyek lehet\u0151v\u00e9 teszik a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t SMM szinten.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Az InsydeH2O keretrendszerben, amelyet sz\u00e1mos gy\u00e1rt\u00f3 haszn\u00e1l UEFI firmware-ek l\u00e9trehoz\u00e1s\u00e1ra a saj\u00e1t hardver\u00e9hez (a legelterjedtebb UEFI BIOS megval\u00f3s\u00edt\u00e1s), 23 s\u00e9r\u00fcl\u00e9kenys\u00e9get azonos\u00edtottak, amelyek lehet\u0151v\u00e9 teszik a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t SMM (System Management Mode) szinten, ami magasabb priorit\u00e1s\u00fa (Ring -2), mint a hypervisor \u00e9s a nulladik v\u00e9delmi gy\u0171r\u0171, \u00e9s korl\u00e1tlan hozz\u00e1f\u00e9r\u00e9st biztos\u00edt minden mem\u00f3ri\u00e1hoz. A probl\u00e9ma olyan UEFI firmware-eket \u00e9rint, amelyeket olyan gy\u00e1rt\u00f3k haszn\u00e1lnak, mint a Fujitsu, Siemens, Dell, HP, HPE, Lenovo, Microsoft, Intel \u00e9s Bull Atos.    <\/p>\n<p>A s\u00e9r\u00fcl\u00e9kenys\u00e9gek kihaszn\u00e1l\u00e1s\u00e1hoz helyi adminisztr\u00e1tori jogokra van sz\u00fcks\u00e9g, ami ezeket a probl\u00e9m\u00e1kat m\u00e1sodlagos s\u00e9r\u00fcl\u00e9kenys\u00e9gekk\u00e9nt n\u00e9pszer\u0171s\u00edti, amelyeket m\u00e1s s\u00e9r\u00fcl\u00e9kenys\u00e9gek kihaszn\u00e1l\u00e1sa ut\u00e1n vagy t\u00e1rsadalmi manipul\u00e1ci\u00f3s m\u00f3dszerekkel lehet alkalmazni. Az SMM szint\u0171 hozz\u00e1f\u00e9r\u00e9s lehet\u0151v\u00e9 teszi a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t egy oper\u00e1ci\u00f3s rendszeren k\u00edv\u00fcli szinten, amit fel lehet haszn\u00e1lni firmware-ek m\u00f3dos\u00edt\u00e1s\u00e1ra, rejtett rosszindulat\u00fa k\u00f3dok vagy rootkit-ek SPI Flash-be \u00e1gyaz\u00e1s\u00e1ra, amelyek az oper\u00e1ci\u00f3s rendszerb\u0151l nem \u00e9szlelhet\u0151k, valamint a bet\u00f6lt\u00e9si szakaszban (UEFI Secure Boot, Intel BootGuard) a hiteles\u00edt\u00e9s letilt\u00e1s\u00e1ra \u00e9s hypervisorok elleni t\u00e1mad\u00e1sokra a virtu\u00e1lis k\u00f6rnyezetek integrit\u00e1sellen\u0151rz\u00e9si mechanizmusainak megker\u00fcl\u00e9s\u00e9re.  <center><img decoding=\"async\" alt=\"Az InsydeH2O keretrendszeren alapul\u00f3 UEFI firmware-sebezhet\u0151s\u00e9gek, amelyek lehet\u0151v\u00e9 teszik a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t SMM szinten.\" src=\"\/wp-content\/uploads\/2022\/02\/dcf918bee3be0d2788f82d325cd671c7.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>A s\u00e9r\u00fcl\u00e9kenys\u00e9gek kihaszn\u00e1l\u00e1sa v\u00e9grehajthat\u00f3 az oper\u00e1ci\u00f3s rendszeren bel\u00fcl nem ellen\u0151rz\u00f6tt SMI (System Management Interrupt) kezel\u0151k seg\u00edts\u00e9g\u00e9vel, valamint az oper\u00e1ci\u00f3s rendszer v\u00e9grehajt\u00e1sa el\u0151tt a bet\u00f6lt\u00e9si folyamat kezdeti szakaszaiban vagy a hibern\u00e1ci\u00f3b\u00f3l val\u00f3 visszat\u00e9r\u00e9s sor\u00e1n. Minden s\u00e9r\u00fcl\u00e9kenys\u00e9g mem\u00f3riahaszn\u00e1lati probl\u00e9m\u00e1kb\u00f3l ad\u00f3dik, \u00e9s h\u00e1rom kateg\u00f3ri\u00e1ba sorolhat\u00f3:   <\/p>\n<ul>\n<li class=\"l\"> SMM Callout  \u2014 a k\u00f3d v\u00e9grehajt\u00e1sa SMM jogosults\u00e1gokkal az SWSMI megszak\u00edt\u00f3k kezel\u0151inek v\u00e9grehajt\u00e1s\u00e1nak \u00e1tir\u00e1ny\u00edt\u00e1s\u00e1val a SMRAM-on k\u00edv\u00fcli k\u00f3dra;\n<li class=\"l\"> Mem\u00f3riak\u00e1rosod\u00e1s, amely lehet\u0151v\u00e9 teszi a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra, hogy az SMRAM-ba, egy speci\u00e1lisan izol\u00e1lt mem\u00f3ria ter\u00fcletre \u00edrjon, ahol SMM jogosults\u00e1gokkal rendelkez\u0151 k\u00f3d fut.\n<li class=\"l\"> Mem\u00f3riak\u00e1rosod\u00e1s a DXE (Driver eXecution Environment) szinten v\u00e9grehajtott k\u00f3dban.  <\/ul>\n<p>A t\u00e1mad\u00e1si szervez\u00e9s elveinek bemutat\u00e1s\u00e1ra egy p\u00e9ld\u00e1t k\u00f6zz\u00e9tettek, amely lehet\u0151v\u00e9 teszi, hogy a harmadik vagy nulladik v\u00e9delmi gy\u0171r\u0171n kereszt\u00fcli t\u00e1mad\u00e1s r\u00e9v\u00e9n hozz\u00e1f\u00e9rjenek a DXE Runtime UEFI-hez \u00e9s v\u00e9grehajts\u00e1k saj\u00e1t k\u00f3djukat. Az exploit a stack overflow (CVE-2021-42059) manipul\u00e1l\u00e1s\u00e1val m\u0171k\u00f6dik az UEFI DXE meghajt\u00f3ban. A t\u00e1mad\u00e1s sor\u00e1n a t\u00e1mad\u00f3 a saj\u00e1t k\u00f3dj\u00e1t elhelyezheti a DXE-meghajt\u00f3ban, amely a m\u0171velet rendszere \u00fajraind\u00edt\u00e1sa ut\u00e1n is akt\u00edv marad, vagy m\u00f3dos\u00edthatja az NVRAM ter\u00fclet\u00e9t az SPI Flash-ben. A v\u00e9grehajt\u00e1s sor\u00e1n a t\u00e1mad\u00f3 k\u00f3dja m\u00f3dos\u00edthatja a magasabb jogosults\u00e1g\u00fa mem\u00f3ria ter\u00fcleteit, m\u00f3dos\u00edthatja az EFI Runtime szolg\u00e1ltat\u00e1sokat \u00e9s befoly\u00e1solhatja a rendszer bet\u00f6lt\u00e9si folyamat\u00e1t.<br \/>\n<br \/>Forr\u00e1s: <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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