{"id":102321,"date":"2021-11-18T21:36:40","date_gmt":"2021-11-18T19:36:41","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predlozhen-metod-ataki-dlya-udalyonnogo-opredeleniya-fragmentov-pamyati-na-servere"},"modified":"2021-11-18T21:36:40","modified_gmt":"2021-11-18T19:36:41","slug":"predlozhen-metod-ataki-dlya-udalyonnogo-opredeleniya-fragmentov-pamyati-na-servere","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/predlozhen-metod-ataki-dlya-udalyonnogo-opredeleniya-fragmentov-pamyati-na-servere","title":{"rendered":"Javasolt\u00e1k a t\u00e1voli mem\u00f3riafragmentsz\u00e1mok meghat\u00e1roz\u00e1s\u00e1nak t\u00e1mad\u00e1si m\u00f3dszer\u00e9t egy szerveren.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A kutat\u00f3k csoportja a grazi m\u0171szaki egyetemr\u0151l (Ausztria), akik kor\u00e1bban az MDS, NetSpectre, Throwhammer \u00e9s ZombieLoad t\u00e1mad\u00e1sok fejleszt\u00e9s\u00e9r\u0151l voltak ismertek, \u00faj t\u00e1mad\u00e1si m\u00f3dszert (CVE-2021-3714) tett k\u00f6zz\u00e9, amely a mem\u00f3riad\u00e9dublik\u00e1l\u00e1s mechanizmuson kereszt\u00fcl lehet\u0151v\u00e9 teszi bizonyos adatok jelenl\u00e9t\u00e9nek meghat\u00e1roz\u00e1s\u00e1t a mem\u00f3ri\u00e1ban, byte-alap\u00fa mem\u00f3ria-tartalom kifoly\u00e1s\u00e1nak megszervez\u00e9s\u00e9t vagy a mem\u00f3ria elrendez\u00e9s\u00e9nek az ASLR-alap\u00fa v\u00e9delem megker\u00fcl\u00e9s\u00e9re val\u00f3 azonos\u00edt\u00e1s\u00e1t. Az eddig bemutatott deduplik\u00e1ci\u00f3s mechanizmusok t\u00e1mad\u00e1si lehet\u0151s\u00e9geit\u0151l elt\u00e9r\u0151en, az \u00faj m\u00f3dszer a t\u00e1mad\u00e1s k\u00fcls\u0151 g\u00e9pr\u0151l t\u00f6rt\u00e9n\u0151 v\u00e9grehajt\u00e1s\u00e1val k\u00fcl\u00f6nb\u00f6zik, az id\u0151v\u00e1ltoz\u00e1sokat alapul v\u00e9ve a t\u00e1mad\u00f3 \u00e1ltal k\u00fcld\u00f6tt HTTP\/1 \u00e9s HTTP\/2 protokollok seg\u00edts\u00e9g\u00e9vel. A t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1nak lehet\u0151s\u00e9g\u00e9t Linux \u00e9s Windows alap\u00fa szervereken demonstr\u00e1lt\u00e1k. <\/p>\n

A mem\u00f3ria deduplik\u00e1l\u00e1si mechanizmusok t\u00e1mad\u00e1sai a mem\u00f3ria-tartalom kifoly\u00e1s\u00e1hoz a \u00edr\u00e1si m\u0171velet feldolgoz\u00e1si idej\u00e9nek elt\u00e9r\u00e9s\u00e9t haszn\u00e1lj\u00e1k, amikor az adatok m\u00f3dos\u00edt\u00e1sa miatt a deduplik\u00e1lt mem\u00f3riaoldal m\u00e1sol\u00e1s\u00e1ra ker\u00fcl sor a Copy-On-Write (COW) mechanizmus haszn\u00e1lat\u00e1val. A kernel a k\u00fcl\u00f6nb\u00f6z\u0151 folyamatok azonos mem\u00f3riaoldalait azonos\u00edtja, \u00e9s egyes\u00edti \u0151ket, mik\u00f6zben az azonos mem\u00f3riaoldalakat egyetlen fizikai mem\u00f3ria ter\u00fcletre t\u00e9rk\u00e9pezi, hogy csak egy p\u00e9ld\u00e1nyt t\u00e1roljon. Amikor az egyik folyamat megpr\u00f3b\u00e1lja m\u00f3dos\u00edtani a deduplik\u00e1lt oldalakkal kapcsolatos adatokat, kiv\u00e9tel (page fault) l\u00e9p fel, \u00e9s a Copy-On-Write mechanizmus seg\u00edts\u00e9g\u00e9vel automatikusan l\u00e9trej\u00f6n a mem\u00f3riaoldal k\u00fcl\u00f6n p\u00e9ld\u00e1nya, amely a folyamathoz van rendelve. A m\u00e1sol\u00e1s elv\u00e9gz\u00e9s\u00e9hez tov\u00e1bbi id\u0151 sz\u00fcks\u00e9ges, ami jelezheti m\u00e1s folyamatok \u00e1ltal \u00e9rintett adatok m\u00f3dos\u00edt\u00e1s\u00e1t. <\/p>\n

A kutat\u00f3k megmutatt\u00e1k, hogy a COW mechanizmus m\u0171k\u00f6d\u00e9se sor\u00e1n bek\u00f6vetkez\u0151 k\u00e9sleked\u00e9sek nemcsak helyben, hanem a h\u00e1l\u00f3zaton az v\u00e1laszok sz\u00e1ll\u00edt\u00e1si idej\u00e9nek elemz\u00e9s\u00e9vel is \u00e9szlelhet\u0151k. Javasoltak t\u00f6bb m\u00f3dszert a mem\u00f3ria tartalm\u00e1nak meghat\u00e1roz\u00e1s\u00e1ra t\u00e1voli g\u00e9pr\u0151l az HTTP\/1 \u00e9s HTTP\/2 protokollok k\u00e9r\u00e9sv\u00e9grehajt\u00e1si idej\u00e9nek elemz\u00e9se alapj\u00e1n. A keresett mint\u00e1k meg\u0151rz\u00e9s\u00e9re tipikus webalkalmaz\u00e1sokat haszn\u00e1lnak, amelyek a be\u00e9rkez\u0151 k\u00e9r\u00e9sekben tal\u00e1lhat\u00f3 inform\u00e1ci\u00f3t a mem\u00f3ri\u00e1ban t\u00e1rolj\u00e1k. <\/p>\n

A t\u00e1mad\u00e1s \u00e1ltal\u00e1nos elve az szerveren<\/a> A mem\u00f3ri oldalai adatokat t\u00e1rolnak, amelyek potenci\u00e1lisan megism\u00e9tlik egy m\u00e1r megl\u00e9v\u0151 mem\u00f3ri oldal tartalm\u00e1t a szerveren. Ezut\u00e1n a t\u00e1mad\u00f3 megv\u00e1rja azt az id\u0151t, amely a kernelt\u0151l a deduplik\u00e1l\u00e1si \u00e9s a mem\u00f3riablokkok egyes\u00edt\u00e9si folyamathoz sz\u00fcks\u00e9ges, majd m\u00f3dos\u00edtja az ir\u00e1ny\u00edt\u00e1sa alatt \u00e1ll\u00f3 adatmint\u00e1t, \u00e9s \u00e9rt\u00e9keli a reakci\u00f3id\u0151t a t\u00e1mad\u00e1s sikeress\u00e9ge \u00e9rdek\u00e9ben.

\"Javasolt\u00e1k<\/center> <\/p>\n

A v\u00e9grehajtott k\u00eds\u00e9rletek sor\u00e1n a maxim\u00e1lis inform\u00e1ci\u00f3sziv\u00e1rg\u00e1si sebess\u00e9g 34,41 b\u00e1jt \u00f3r\u00e1nk\u00e9nt volt glob\u00e1lis h\u00e1l\u00f3zati t\u00e1mad\u00e1s eset\u00e9n, m\u00edg helyi h\u00e1l\u00f3zati t\u00e1mad\u00e1s sor\u00e1n 302,16 b\u00e1jt \u00f3r\u00e1nk\u00e9nt, ami gyorsabb, mint m\u00e1s k\u00fcls\u0151 csatorn\u00e1kon t\u00f6rt\u00e9n\u0151 adatkinyer\u00e9si m\u00f3dszerek (p\u00e9ld\u00e1ul a NetSpectre t\u00e1mad\u00e1s sebess\u00e9ge 7,5 b\u00e1jt \u00f3r\u00e1nk\u00e9nt). <\/p>\n

H\u00e1rom m\u0171k\u00f6d\u0151 t\u00e1mad\u00e1si lehet\u0151s\u00e9g ker\u00fclt javaslatra. Az els\u0151 lehet\u0151s\u00e9g lehet\u0151v\u00e9 teszi az adatok meg\u00e1llap\u00edt\u00e1s\u00e1t a mem\u00f3ri\u00e1ban webszerverek<\/a>, amely a Memcached haszn\u00e1lat\u00e1val t\u00f6rt\u00e9nik. A t\u00e1mad\u00e1s l\u00e9nyege, hogy bizonyos adathalmazon kereszt\u00fcl bet\u00f6lti ezeket a mem\u00f3ri\u00e1ba, t\u00f6rli a deduplik\u00e1lt blokkot, \u00fajra\u00edrja ugyanazt az elemet, \u00e9s olyan k\u00f6r\u00fclm\u00e9nyt teremt, amely lehet\u0151v\u00e9 teszi a COW m\u00e1sol\u00e1s l\u00e9trej\u00f6tt\u00e9t a blokk tartalm\u00e1nak megv\u00e1ltoztat\u00e1s\u00e1val. A Memcached-dal v\u00e9gzett k\u00eds\u00e9rlet sor\u00e1n 166,51 m\u00e1sodperc alatt siker\u00fclt meghat\u00e1rozni a rendszerben telep\u00edtett libc verzi\u00f3t, amely virtu\u00e1lis g\u00e9pen futott. <\/p>\n

A m\u00e1sodik lehet\u0151s\u00e9g lehet\u0151v\u00e9 tette a MariaDB adatb\u00e1zis-kezel\u0151 rendszer bejegyz\u00e9seinek tartalm\u00e1nak megismer\u00e9s\u00e9t az InnoDB t\u00e1rol\u00f3 haszn\u00e1lat\u00e1val, byte-by-byte tartalom \u00fajragener\u00e1l\u00e1sa r\u00e9v\u00e9n. A t\u00e1mad\u00e1s kifejezetten m\u00f3dos\u00edtott k\u00e9r\u00e9sek k\u00fcld\u00e9s\u00e9vel zajlik, amelyek egyetlen byte elt\u00e9r\u00e9seket okoznak a mem\u00f3riablokkokban, \u00e9s a reakci\u00f3id\u0151 elemz\u00e9s\u00e9vel lehet meghat\u00e1rozni, hogy a byte tartalm\u00e1ra tett tal\u00e1lgat\u00e1s helyes volt. Az ilyen jelleg\u0171 sziv\u00e1rg\u00e1s sebess\u00e9ge alacsony, mind\u00f6ssze 1,5 byte \u00f3r\u00e1nk\u00e9nt helyi h\u00e1l\u00f3zatb\u00f3l. A m\u00f3dszer el\u0151nye, hogy haszn\u00e1lhat\u00f3 ismeretlen mem\u00f3riatartalom helyre\u00e1ll\u00edt\u00e1s\u00e1ra. <\/p>\n

A harmadik lehet\u0151s\u00e9g lehet\u0151v\u00e9 tette a KASLR v\u00e9delmi mechanizmus teljes megker\u00fcl\u00e9s\u00e9t 4 perc alatt, \u00e9s inform\u00e1ci\u00f3t szerzett a virtu\u00e1lis g\u00e9p kernel k\u00e9p\u00e9nek mem\u00f3riac\u00edm\u00e9r\u0151l, abban az esetben, amikor a c\u00edmz\u00e9si eltol\u00e1s a mem\u00f3ri\u00e1ban tal\u00e1lhat\u00f3 oldalon helyezkedik el, amelynek egy\u00e9b adatai nem v\u00e1ltoznak. A t\u00e1mad\u00e1st egy olyan gazdag\u00e9pr\u0151l ind\u00edtott\u00e1k, amely 14 tranzit \u00e1tj\u00e1r\u00f3n (hop) kereszt\u00fcl volt a t\u00e1madott rendszerrel. A bemutatott t\u00e1mad\u00e1sok v\u00e9grehajt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges k\u00f3d p\u00e9ld\u00e1it a GitHub-on \u00edg\u00e9rt\u00e9k k\u00f6zz\u00e9tenni.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0413\u0440\u0430\u0446\u0441\u043a\u043e\u0433\u043e \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0410\u0432\u0441\u0442\u0440\u0438\u044f), \u0440\u0430\u043d\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0430\u0442\u0430\u043a MDS, NetSpectre, Throwhammer \u0438 ZombieLoad, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 (CVE-2021-3714) \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c \u043d\u0430 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0434\u0435\u0434\u0443\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0441\u0442\u0440\u0430\u043d\u0438\u0446 \u043f\u0430\u043c\u044f\u0442\u0438 (Memory-Deduplication), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u0432 \u043f\u0430\u043c\u044f\u0442\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445, \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0431\u0430\u0439\u0442\u043e\u0432\u0443\u044e \u0443\u0442\u0435\u0447\u043a\u0443 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043f\u0430\u043c\u044f\u0442\u0438 \u0438\u043b\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0440\u0430\u0441\u043a\u043b\u0430\u0434\u043a\u0443 \u043f\u0430\u043c\u044f\u0442\u0438 \u0434\u043b\u044f \u043e\u0431\u0445\u043e\u0434\u0430 \u0437\u0430\u0449\u0438\u0442\u044b \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0440\u0430\u043d\u0434\u043e\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u0430\u0434\u0440\u0435\u0441\u043e\u0432 (ASLR). \u041e\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":102322,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102321","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47T\u00e1mad\u00e1si m\u00f3dszert javasoltak a mem\u00f3riaf\u788egm\u00e9nyek t\u00e1voli meghat\u00e1roz\u00e1s\u00e1ra a szerveren | ProHoster","description":"A grazi m\u0171szaki egyetem kutat\u00f3csoportja (Ausztria), amely kor\u00e1bban az MDS, NetSpectre, Throwhammer \u00e9s ZombieLoad t\u00e1mad\u00e1sok kidolgoz\u00e1s\u00e1r\u00f3l volt ismert, \u00faj t\u00e1mad\u00e1si m\u00f3dszert (CVE-2021-3714) publik\u00e1lt k\u00fcls\u0151 csatorn\u00e1kon.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/predlozhen-metod-ataki-dlya-udalyonnogo-opredeleniya-fragmentov-pamyati-na-servere","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\u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u043e\u0432 \u043f\u0430\u043c\u044f\u0442\u0438 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435 | ProHoster","og:description":"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0413\u0440\u0430\u0446\u0441\u043a\u043e\u0433\u043e \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0410\u0432\u0441\u0442\u0440\u0438\u044f), \u0440\u0430\u043d\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0430\u0442\u0430\u043a MDS, NetSpectre, Throwhammer \u0438 ZombieLoad, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 (CVE-2021-3714) \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c 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