{"id":101725,"date":"2021-10-22T16:22:55","date_gmt":"2021-10-22T14:22:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ataka-na-intel-sgx-pozvolyayushhaya-izvlech-konfidenczialnye-dannye-ili-vypolnit-kod-v-anklave"},"modified":"2021-10-22T16:22:55","modified_gmt":"2021-10-22T14:22:58","slug":"ataka-na-intel-sgx-pozvolyayushhaya-izvlech-konfidenczialnye-dannye-ili-vypolnit-kod-v-anklave","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/ataka-na-intel-sgx-pozvolyayushhaya-izvlech-konfidenczialnye-dannye-ili-vypolnit-kod-v-anklave","title":{"rendered":"T\u00e1mad\u00e1s az Intel SGX ellen, amely lehet\u0151v\u00e9 teszi a bizalmas adatok kiemel\u00e9s\u00e9t vagy k\u00f3d v\u00e9grehajt\u00e1s\u00e1t az encl\u00e1v\u00e9ban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A K\u00ednai N\u00e9pi Felszabad\u00edt\u00f3 Hadsereg M\u0171szaki Egyetem\u00e9nek, a Szingap\u00fari Nemzeti Egyetemnek \u00e9s a Z\u00fcrichi M\u0171szaki Egyetemnek a kutat\u00f3i egy \u00faj t\u00e1mad\u00e1si m\u00f3dszert fejlesztettek ki az Intel SGX (Software Guard eXtensions) elszigetelt encl\u00e1v\u00e9i ellen. A t\u00e1mad\u00e1st SmashEx n\u00e9ven ismerik, \u00e9s a runtime komponensek kiv\u00e9telkezel\u00e9se sor\u00e1n felmer\u00fcl\u0151 rekurz\u00edv probl\u00e9m\u00e1k v\u00e1ltott\u00e1k ki. A javasolt t\u00e1mad\u00e1si m\u00f3dszer lehet\u0151s\u00e9get ad arra, hogy ha a felhaszn\u00e1l\u00f3 ellen\u0151rzi az oper\u00e1ci\u00f3s rendszert, az encl\u00e1v\u00e9ban t\u00e1rolt bizalmas adatokat azonos\u00edts\u00e1k, vagy lehet\u0151v\u00e9 teszi a saj\u00e1t k\u00f3d m\u00e1sol\u00e1s\u00e1t az encl\u00e1v\u00e9 mem\u00f3ri\u00e1j\u00e1ba \u00e9s annak v\u00e9grehajt\u00e1s\u00e1t. <\/p>\n

Az exploitekb\u00f3l protot\u00edpusok k\u00e9sz\u00fcltek az Intel SGX SDK (CVE-2021-0186) \u00e9s a Microsoft Open Enclave (CVE-2021-33767) runtime-jal rendelkez\u0151 encl\u00e1v\u00e9k sz\u00e1m\u00e1ra. Az els\u0151 esetben bemutatt\u00e1k az RSA kulcs kiemel\u00e9s\u00e9nek lehet\u0151s\u00e9g\u00e9t, amelyet a webkiszolg\u00e1l\u00f3n HTTPS-hez haszn\u00e1lnak, a m\u00e1sodik esetben pedig siker\u00fclt meghat\u00e1rozni a cURL seg\u00e9dprogram \u00e1ltal az encl\u00e1v\u00e9ben futtatott tartalmat. A sebezhet\u0151s\u00e9get m\u00e1r szoftveresen jav\u00edtott\u00e1k az Intel SGX SDK 2.13 \u00e9s Open Enclave 0.17.1 verzi\u00f3iban. Az Intel SGX SDK \u00e9s a Microsoft Open Enclave csomagjain k\u00edv\u00fcl a sebezhet\u0151s\u00e9g jelen van a Google Asylo, EdgelessRT, Apache Teaclave, Rust SGX SDK, SGX-LKL, CoSMIX \u00e9s Veracruz SDK-kban is. <\/p>\n

Eml\u00e9keztet\u0151\u00fcl, az SGX (Software Guard Extensions) technol\u00f3gia az Intel Core hatodik gener\u00e1ci\u00f3s processzoraiban (Skylake) jelent meg, \u00e9s egy sor olyan utas\u00edt\u00e1st k\u00edn\u00e1l, amelyek lehet\u0151v\u00e9 teszik a felhaszn\u00e1l\u00f3i alkalmaz\u00e1sok sz\u00e1m\u00e1ra, hogy z\u00e1rt mem\u00f3ria ter\u00fcleteket - enkl\u00e1v\u00e9kat - hozzanak l\u00e9tre, amelyek tartalma m\u00e9g a kernelt\u0151l \u00e9s a ring0, SMM \u00e9s VMM m\u00f3dokban fut\u00f3 k\u00f3dt\u00f3l sem olvashat\u00f3 vagy m\u00f3dos\u00edthat\u00f3. Az ir\u00e1ny\u00edt\u00e1st nem lehet a szok\u00e1sos ugr\u00e1si funkci\u00f3kkal \u00e9s a regiszterek, valamint a verem manipul\u00e1l\u00e1s\u00e1val \u00e1tadni az enkl\u00e1v\u00e1nak - az ir\u00e1ny\u00edt\u00e1s \u00e1tad\u00e1s\u00e1hoz \u00fajonnan l\u00e9trehozott EENTER, EEXIT \u00e9s ERESUME utas\u00edt\u00e1sokat haszn\u00e1lnak, amelyek ellen\u0151rzik a jogosults\u00e1gokat. Ezenk\u00edv\u00fcl az enkl\u00e1v\u00e9ba helyezett k\u00f3d klasszikus h\u00edv\u00e1si m\u00f3dszereket alkalmazhat az enkl\u00e1v\u00e9n bel\u00fcli funkci\u00f3k el\u00e9r\u00e9s\u00e9re, \u00e9s egy speci\u00e1lis utas\u00edt\u00e1st k\u00fcls\u0151 funkci\u00f3k h\u00edv\u00e1s\u00e1ra. A hardveres t\u00e1mad\u00e1sok, p\u00e9ld\u00e1ul a DRAM modulhoz val\u00f3 csatlakoz\u00e1s elleni v\u00e9delemhez az enkl\u00e1v\u00e9 mem\u00f3ri\u00e1j\u00e1nak titkos\u00edt\u00e1s\u00e1t alkalmazz\u00e1k.

\"T\u00e1mad\u00e1s<\/center> <\/p>\n

A probl\u00e9ma azzal kapcsolatos, hogy az SGX technol\u00f3gia lehet\u0151v\u00e9 teszi az oper\u00e1ci\u00f3s rendszer sz\u00e1m\u00e1ra, hogy megszak\u00edtsa az encl\u00e1v v\u00e9grehajt\u00e1s\u00e1t egy hardveres kiv\u00e9tel gener\u00e1l\u00e1s\u00e1val, \u00e9s az encl\u00e1v\u00e9ban nem val\u00f3sultak meg megfelel\u0151en az ilyen kiv\u00e9telek atomikus kezel\u00e9s\u00e9re vonatkoz\u00f3 primit\u00edvek. Az oper\u00e1ci\u00f3s rendszer magj\u00e1t\u00f3l \u00e9s a norm\u00e1l alkalmaz\u00e1sokt\u00f3l elt\u00e9r\u0151en az encl\u00e1v\u00e9ban l\u00e9v\u0151 k\u00f3d nem f\u00e9r hozz\u00e1 az aszinkron m\u00f3don felmer\u00fcl\u0151 kiv\u00e9telek feldolgoz\u00e1s\u00e1hoz sz\u00fcks\u00e9ges atomikus m\u0171veletekhez. Az eml\u00edtett atomikus primit\u00edvek hi\u00e1ny\u00e1ban az encl\u00e1v\u00e9 b\u00e1rmikor megszak\u00edthat\u00f3 \u00e9s visszat\u00e9rhet a v\u00e9grehajt\u00e1sra, m\u00e9g akkor is, amikor kritikus szakaszok zajlanak az encl\u00e1v\u00e9ban, \u00e9s az nem biztons\u00e1gos \u00e1llapotban van (p\u00e9ld\u00e1ul amikor a CPU regiszterek nincsenek mentve\/helyre\u00e1ll\u00edtva).

\"T\u00e1mad\u00e1s<\/center> <\/p>\n

Az SGX technol\u00f3gia lehet\u0151v\u00e9 teszi az encl\u00e1v v\u00e9grehajt\u00e1s\u00e1nak megszak\u00edt\u00e1s\u00e1t testreszabhat\u00f3 hardveres kiv\u00e9telekkel a megfelel\u0151 m\u0171k\u00f6d\u00e9s \u00e9rdek\u00e9ben. Ez a lehet\u0151s\u00e9g lehet\u0151v\u00e9 teszi az encl\u00e1v\u00e9 runtime k\u00f6rnyezetek sz\u00e1m\u00e1ra, hogy feldolgozz\u00e1k a bels\u0151 encl\u00e1v\u00e9 kiv\u00e9teleket vagy jeleket, de ez ugyanakkor reentrability hib\u00e1kat is okozhat. A SmashEx t\u00e1mad\u00e1s az SDK hi\u00e1nyoss\u00e1gainak kihaszn\u00e1l\u00e1s\u00e1n alapul, amelyek miatt a kiv\u00e9telkezel\u0151 \u00fajrah\u00edv\u00e1s\u00e1nak helyzete megfelel\u0151en nem kezelhet\u0151. Fontos, hogy a sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1hoz a t\u00e1mad\u00f3nak lehet\u0151s\u00e9ge legyen megszak\u00edtani az encl\u00e1v v\u00e9grehajt\u00e1s\u00e1t, teh\u00e1t ellen\u0151riznie kell a rendszeri k\u00f6rnyezet m\u0171k\u00f6d\u00e9s\u00e9t. <\/p>\n

A kiv\u00e9tel gener\u00e1l\u00e1sa ut\u00e1n a t\u00e1mad\u00f3 egy kis id\u0151ablakhoz jut, amely alatt elfoghatja a v\u00e9grehajt\u00e1si folyamatot a bel\u00e9p\u00e9si param\u00e9terek manipul\u00e1l\u00e1s\u00e1val. K\u00fcl\u00f6n\u00f6sen, ha van hozz\u00e1f\u00e9r\u00e9se a rendszerhez (az encl\u00e1von k\u00edv\u00fcli k\u00f6rnyezethez), \u00faj kiv\u00e9telt hozhat l\u00e9tre k\u00f6zvetlen\u00fcl az encl\u00e1vba val\u00f3 bel\u00e9p\u00e9s (EENTER) utas\u00edt\u00e1s v\u00e9grehajt\u00e1sa ut\u00e1n, ami azt eredm\u00e9nyezi, hogy a vez\u00e9rl\u00e9s visszat\u00e9r a rendszerhez egy olyan \u00e1llapotban, amikor m\u00e9g nem fejez\u0151d\u00f6tt be az encl\u00e1v sz\u00e1m\u00e1ra a stack be\u00e1ll\u00edt\u00e1sa, amelyhez a CPU regiszterek \u00e1llapot\u00e1nak meg\u0151rz\u00e9se is hozz\u00e1tartozik. <\/p>\n

A rendszer ezut\u00e1n visszaadhatja az ir\u00e1ny\u00edt\u00e1st az enkl\u00e1v\u00e9nak, de mivel az enkl\u00e1v\u00e9 verem nem volt be\u00e1ll\u00edtva a megszak\u00edt\u00e1s sor\u00e1n, az enkl\u00e1v\u00e9 a rendszer mem\u00f3ri\u00e1j\u00e1ban tal\u00e1lhat\u00f3 veremmel fog v\u00e9grehajt\u00f3dni, amit a visszat\u00e9r\u00e9si orient\u00e1lt programoz\u00e1s (ROP - Return-Oriented Programming) alap\u00fa kihaszn\u00e1l\u00e1s alkalmaz\u00e1s\u00e1hoz haszn\u00e1lnak. A ROP technika haszn\u00e1latakor a t\u00e1mad\u00f3 nem pr\u00f3b\u00e1lja meg a saj\u00e1t k\u00f3dj\u00e1t elhelyezni a mem\u00f3ri\u00e1ban, hanem a m\u00e1r bet\u00f6lt\u00f6tt k\u00f6nyvt\u00e1rakban l\u00e9v\u0151 g\u00e9pi utas\u00edt\u00e1sok darabjaival oper\u00e1l, amelyek visszat\u00e9r\u00e9si utas\u00edt\u00e1ssal v\u00e9gz\u0151dnek (ez \u00e1ltal\u00e1ban k\u00f6nyvt\u00e1ri funkci\u00f3k v\u00e9g\u00e9n tal\u00e1lhat\u00f3). A kihaszn\u00e1l\u00e1s m\u0171k\u00f6d\u00e9se arra korl\u00e1toz\u00f3dik, hogy az ilyen blokkok ('gadgetek') h\u00edv\u00e1si l\u00e1nc\u00e1t \u00e1ll\u00edtsa \u00f6ssze a k\u00edv\u00e1nt funkcionalit\u00e1s el\u00e9r\u00e9s\u00e9hez.

\"T\u00e1mad\u00e1s<\/center>
\"T\u00e1mad\u00e1s<\/center>
\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 \u0438\u0437 \u041e\u0431\u043e\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u043d\u0430\u0443\u0447\u043d\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 \u041d\u0430\u0440\u043e\u0434\u043d\u043e-\u043e\u0441\u0432\u043e\u0431\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0430\u0440\u043c\u0438\u0438 \u041a\u0438\u0442\u0430\u044f, \u041d\u0430\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0421\u0438\u043d\u0433\u0430\u043f\u0443\u0440\u0430 \u0438 \u0428\u0432\u0435\u0439\u0446\u0430\u0440\u0441\u043a\u043e\u0439 \u0432\u044b\u0441\u0448\u0435\u0439 \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0448\u043a\u043e\u043b\u044b \u0426\u044e\u0440\u0438\u0445\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u0430\u043d\u043a\u043b\u0430\u0432\u044b Intel SGX (Software Guard eXtensions). \u0410\u0442\u0430\u043a\u0430 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 SmashEx \u0438 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u0441 \u0440\u0435\u0435\u043d\u0442\u0435\u0440\u0430\u0431\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c\u044e \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0438\u0441\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0439 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0440\u0430\u0431\u043e\u0442\u044b runtime-\u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u043e\u0432 \u0434\u043b\u044f Intel SGX. \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":101726,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-101725","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\u00e1s az Intel SGX ellen, amely 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