{"id":119185,"date":"2024-08-08T09:43:01","date_gmt":"2024-08-08T07:43:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-ghostwrite-predostavlyayushhaya-polnyj-dostup-k-fizicheskoj-pamyati-na-cpu-risc-v-xuantie"},"modified":"2024-08-08T09:43:01","modified_gmt":"2024-08-08T07:43:01","slug":"uyazvimost-ghostwrite-predostavlyayushhaya-polnyj-dostup-k-fizicheskoj-pamyati-na-cpu-risc-v-xuantie","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-ghostwrite-predostavlyayushhaya-polnyj-dostup-k-fizicheskoj-pamyati-na-cpu-risc-v-xuantie","title":{"rendered":"A GhostWrite sebezhet\u0151s\u00e9g, amely teljes hozz\u00e1f\u00e9r\u00e9st biztos\u00edt a fizikai mem\u00f3ri\u00e1hoz RISC-V XuanTie CPU-n.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Helmholtz Inform\u00e1ci\u00f3biztons\u00e1gi K\u00f6zpont (CISPA) kutat\u00f3i k\u00f6zz\u00e9tett\u00e9k a RISC-V architekt\u00far\u00e1ra \u00e9p\u00fcl\u0151 processzorok biztons\u00e1g\u00e1nak vizsg\u00e1lat\u00e1nak eredm\u00e9nyeit, \u00e9s felfedt\u00e9k a GhostWrite k\u00f3dnev\u0171 sebezhet\u0151s\u00e9ggel kapcsolatos inform\u00e1ci\u00f3kat. A sebezhet\u0151s\u00e9g a XuanTie C910 RISC-V processzorokat \u00e9rinti, amelyeket a T-Head, az Alibaba egyik le\u00e1nyv\u00e1llalata gy\u00e1rt, \u00e9s amelyek ny\u00edlt projektk\u00e9nt fejl\u0151dnek. A sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi, hogy a t\u00e1mad\u00f3, aki korl\u00e1tozott, nem privilegiz\u00e1lt hozz\u00e1f\u00e9r\u00e9ssel rendelkezik a rendszerhez, olvassa \u00e9s \u00edrja b\u00e1rmely fizikai mem\u00f3ria ter\u00fclet\u00e9t, \u00e9s hozz\u00e1f\u00e9r\u00e9st kapjon a perif\u00e9ri\u00e1s eszk\u00f6z\u00f6k, p\u00e9ld\u00e1ul az MMIO (Mem\u00f3ria-t\u00e9rk\u00e9pezett Bemeneti\/Kimeneti) haszn\u00e1lat\u00e1val m\u0171k\u00f6d\u0151 h\u00e1l\u00f3zati k\u00e1rty\u00e1k kezel\u00e9s\u00e9hez. <\/p>\n

A sebezhet\u0151s\u00e9g a processzor architekt\u00far\u00e1j\u00e1ban tal\u00e1lhat\u00f3 hi\u00e1nyoss\u00e1gok miatt j\u00f6n l\u00e9tre, amelyek a gy\u00e1rt\u00f3 \u00e1ltal hozz\u00e1adott processzor utas\u00edt\u00e1sok izol\u00e1ci\u00f3j\u00e1val kapcsolatosak, amelyek kiterjesztik a RISC-V utas\u00edt\u00e1sk\u00e9szlet architekt\u00far\u00e1j\u00e1t, \u00e9s lehet\u0151v\u00e9 teszik a k\u00f6zvetlen hozz\u00e1f\u00e9r\u00e9st a DRAM-hoz, megker\u00fclve a virtu\u00e1lis mem\u00f3ria mechanizmusait. N\u00e9h\u00e1ny kiterjesztett utas\u00edt\u00e1s k\u00f6zvetlen munkav\u00e9gz\u00e9se a fizikai mem\u00f3ri\u00e1val, nem pedig a virtu\u00e1lis mem\u00f3ri\u00e1val, lehet\u0151s\u00e9get ad a mem\u00f3ria k\u00f6z\u00f6tti izol\u00e1ci\u00f3 megker\u00fcl\u00e9s\u00e9re a folyamatok k\u00f6z\u00f6tt. <\/p>\n

A t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1ra el\u0151k\u00e9sz\u00edtett technika 100%-osan reproduk\u00e1lhat\u00f3, \u00e9s megk\u00f6veteli a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t mind\u00f6ssze n\u00e9h\u00e1ny mikrosekundum alatt. Az elszigetel\u00e9si szoftveres m\u00f3dszerek, mint p\u00e9ld\u00e1ul a kont\u00e9nerek \u00e9s a sandbox k\u00f6rnyezetek, nem akad\u00e1lyozz\u00e1k a sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1t. A sebezhet\u0151s\u00e9g blokkol\u00e1s\u00e1hoz csak a vektoros kiterjeszt\u00e9sek t\u00e1mogat\u00e1s\u00e1nak teljes letilt\u00e1sa seg\u00edt, ami a rvv-bench teszten 33%-os teljes\u00edtm\u00e9nycs\u00f6kken\u00e9st eredm\u00e9nyez (a jelent\u00e9s \u00f6sszefoglal\u00f3 oldala szerint 77%, \u00e1m a r\u00e9szletekben eml\u00edtett memcpy teljes\u00edtm\u00e9nycs\u00f6kken\u00e9s 33%, m\u00edg a memset eset\u00e9ben 8%), \u00e9s k\u00f6r\u00fclbel\u00fcl a dupl\u00e1j\u00e1ra cs\u00f6kkenti az alkalmaz\u00e1sok sz\u00e1m\u00e1ra el\u00e9rhet\u0151 processzor utas\u00edt\u00e1sk\u00e9szletet. <\/p>\n

A XuanTie C910 CPU-k a piacon el\u00e9rhet\u0151 legmagasabb teljes\u00edtm\u00e9ny\u0171 RISC-V chipek k\u00f6z\u00e9 tartoznak, \u00e9s m\u00e1r akt\u00edvan haszn\u00e1lj\u00e1k \u0151ket szervereken<\/a> felh\u0151alap\u00fa rendszerekben \u00e9s laptopokban. P\u00e9ld\u00e1ul a probl\u00e9ma a Scaleway Elastic Metal RV1 szervereken, a Lichee Cluster 4A klasztereken, a Lichee Book 4A notebookon, a Lichee Console 4A j\u00e1t\u00e9kkonzolon, a Lichee Pocket 4A hordozhat\u00f3 sz\u00e1m\u00edt\u00f3g\u00e9pen, a Sipeed Lichee Pi 4A egylapk\u00e1s PC-ken, valamint a Milk-V Meles \u00e9s BeagleV-Ahead eszk\u00f6z\u00f6k\u00f6n jelentkezik. <\/p>\n

A kutat\u00f3k \u00e1ltal k\u00e9sz\u00edtett p\u00e9lda alapj\u00e1n egy exploit lehet\u0151v\u00e9 teszi, hogy egy privilegiz\u00e1latlan felhaszn\u00e1l\u00f3 root jogosults\u00e1gokat szerezzen Linux alatt. Az exploit megv\u00e1ltoztatja a mem\u00f3ria oldal-t\u00e1bl\u00e1j\u00e1nak tartalm\u00e1t, amelyet a virtu\u00e1lis c\u00edmek fizikai c\u00edmekk\u00e9 val\u00f3 \u00e1tkonvert\u00e1l\u00e1s\u00e1ra haszn\u00e1lnak, lehet\u0151v\u00e9 t\u00e9ve a b\u00e1rmilyen fizikai c\u00edmhez kapcsol\u00f3d\u00f3 virtu\u00e1lis c\u00edmek megszerz\u00e9s\u00e9t. Emellett k\u00e9sz\u00fclt egy p\u00e9lda exploit a kernel \u00e9s m\u00e1s folyamatok mem\u00f3ria tartalm\u00e1nak olvas\u00e1s\u00e1ra, amely lehet\u0151v\u00e9 teszi a mem\u00f3ri\u00e1ban t\u00e1rolt titkos\u00edt\u00e1si kulcsok \u00e9s jelszavak kinyer\u00e9s\u00e9t.

Tov\u00e1bbi kutat\u00f3k azonos\u00edtottak m\u00e9g k\u00e9t kev\u00e9sb\u00e9 vesz\u00e9lyes architektur\u00e1lis sebezhet\u0151s\u00e9get \u2014 az egyik a T-Head XuanTie C906 processzorokat \u00e9rinti, a m\u00e1sik pedig a T-Head XuanTie C908-at. Mindk\u00e9t sebezhet\u0151s\u00e9g a CPU m\u0171k\u00f6d\u00e9s\u00e9nek le\u00e1ll\u00edt\u00e1s\u00e1b\u00f3l ad\u00f3d\u00f3 szolg\u00e1ltat\u00e1smegtagad\u00e1si h\u00edv\u00e1sokra korl\u00e1toz\u00f3dik. Ezek a sebezhet\u0151s\u00e9gek vesz\u00e9lyt jelenthetnek a T-Head XuanTie chipekre \u00e9p\u00fcl\u0151 felh\u0151platformokra, mivel ha hozz\u00e1f\u00e9r\u00e9s van a k\u00f3d v\u00e9grehajt\u00e1s\u00e1hoz a felh\u0151 k\u00f6rnyezetben, lehet\u0151s\u00e9g van m\u00e1s felhaszn\u00e1l\u00f3k, akik ugyanazon a platformon szolg\u00e1ltatva vannak, le\u00e1ll\u00edt\u00e1s\u00e1ra. szerveren<\/a>. <\/p>\n

A probl\u00e9m\u00e1kat a RISCVuzz keretrendszer seg\u00edts\u00e9g\u00e9vel t\u00e1rt\u00e1k fel, amely a CPU fuzzing tesztel\u00e9s\u00e9re k\u00e9sz\u00fclt. A keretrendszer felfedi a k\u00fcl\u00f6nbs\u00e9geket a hasonl\u00f3 terjesztett utas\u00edt\u00e1sok megval\u00f3s\u00edt\u00e1sa k\u00f6z\u00f6tt k\u00fcl\u00f6nb\u00f6z\u0151 CPU-kon, figyelembe v\u00e9ve azt a felt\u00e9telez\u00e9st, hogy a RISC-V utas\u00edt\u00e1sk\u00e9szlet egys\u00e9ges regiszter\u00e9nek hi\u00e1nya miatt a k\u00fcl\u00f6nb\u00f6z\u0151 gy\u00e1rt\u00f3k chipein az azonosan k\u00f3dolt utas\u00edt\u00e1sok elt\u00e9r\u0151 v\u00e9grehajt\u00e1sokat eredm\u00e9nyezhetnek. A vizsg\u00e1lat a RISC-V CPU-kon a processzor utas\u00edt\u00e1sok feldolgoz\u00e1sa k\u00f6zben tapasztalt viselked\u00e9s \u00f6sszehasonl\u00edt\u00e1s\u00e1ra \u00e9s az esetleges sebezhet\u0151s\u00e9gek elemz\u00e9s\u00e9re \u00f6sszpontos\u00edtott, ahol viselked\u00e9sbeli elt\u00e9r\u00e9s volt megfigyelhet\u0151.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0426\u0435\u043d\u0442\u0440\u0430 \u0413\u0435\u043b\u044c\u043c\u0433\u043e\u043b\u044c\u0446\u0430 \u043f\u043e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (CISPA) \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 \u043d\u0430 \u0431\u0430\u0437\u0435 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b RISC-V \u0438 \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u0439 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f GhostWrite. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 RISC-V-\u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u044b XuanTie C910, \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u043c\u044b\u0435 \u043a\u0438\u0442\u0430\u0439\u0441\u043a\u043e\u0439 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 T-Head (\u043f\u043e\u0434\u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u0435 Alibaba) \u0438 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u0432 \u0444\u043e\u0440\u043c\u0435 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443, \u0438\u043c\u0435\u044e\u0449\u0435\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0447\u0442\u0435\u043d\u0438\u044f \u0438 […]<\/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-119185","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\udd47A GhostWrite sebezhet\u0151s\u00e9g, amely teljes hozz\u00e1f\u00e9r\u00e9st biztos\u00edt a fizikai mem\u00f3ria CPU RISC-V XuanTie | ProHoster","description":"A Helmholtz Inform\u00e1ci\u00f3biztons\u00e1gi K\u00f6zpont (CISPA) kutat\u00f3i k\u00f6zz\u00e9tett\u00e9k a RISC-V architekt\u00far\u00e1ra \u00e9p\u00fcl\u0151 processzorok v\u00e9delmi kutat\u00e1s\u00e1nak eredm\u00e9nyeit, \u00e9s felfedt\u00e9k a sebezhet\u0151s\u00e9get, amely k\u00f3dnevet kapott.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-ghostwrite-predostavlyayushhaya-polnyj-dostup-k-fizicheskoj-pamyati-na-cpu-risc-v-xuantie","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 GhostWrite, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u043b\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a 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