{"id":53866,"date":"2019-12-12T00:00:00","date_gmt":"2019-12-11T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/plundervolt-novyj-metod-ataki-na-protsessory-intel-zatragivayushhij-tehnologiyu-sgx"},"modified":"2020-02-18T14:01:48","modified_gmt":"2020-02-18T11:01:48","slug":"plundervolt-novyj-metod-ataki-na-protsessory-intel-zatragivayushhij-tehnologiyu-sgx","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/plundervolt-novyj-metod-ataki-na-protsessory-intel-zatragivayushhij-tehnologiyu-sgx","title":{"rendered":"Plundervolt \u2014 egy \u00faj t\u00e1mad\u00e1si m\u00f3dszer az Intel processzorok ellen, amely a SGX technol\u00f3gi\u00e1t \u00e9rinti.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Intel v\u00e1llalat kiadta<\/a><\/noindex> a mikroprogram friss\u00edt\u00e9se, amely megsz\u00fcnteti vulnerability<\/a><\/noindex> (CVE-2019-14607), lehet\u0151v\u00e9 t\u00e9ve<\/a><\/noindex> hogy a CPU fesz\u00fclts\u00e9g- \u00e9s frekvenciakontroll mechanizmus\u00e1nak manipul\u00e1ci\u00f3ival adatsorok tartalm\u00e1nak megs\u00e9rt\u00e9s\u00e9t id\u00e9zze el\u0151, bele\u00e9rtve az Intel SGX izol\u00e1lt k\u00f6rnyezeteiben t\u00f6rt\u00e9n\u0151 sz\u00e1m\u00edt\u00e1sokhoz haszn\u00e1lt ter\u00fcleteket. A t\u00e1mad\u00e1s neve Plundervolt, \u00e9s potenci\u00e1lisan lehet\u0151v\u00e9 teszi a helyi felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra, hogy jogokat szerezzenek a rendszerben, szolg\u00e1ltat\u00e1smegtagad\u00e1st okozzanak, \u00e9s hozz\u00e1f\u00e9rjenek titkos adatokhoz.<\/p>\n

A t\u00e1mad\u00e1s csak az SGX k\u00f6rnyezetekben v\u00e9gzett sz\u00e1m\u00edt\u00e1sok manipul\u00e1l\u00e1sa eset\u00e9n jelent vesz\u00e9lyt, mivel v\u00e9grehajt\u00e1s\u00e1hoz root jogosults\u00e1gok sz\u00fcks\u00e9gesek a rendszerben. A legegyszer\u0171bb esetben a t\u00e1mad\u00f3 el\u00e9rheti az inform\u00e1ci\u00f3k torz\u00edt\u00e1s\u00e1t, amelyek a k\u00f6rnyezetben ker\u00fclnek feldolgoz\u00e1sra, azonban bonyolultabb forgat\u00f3k\u00f6nyvek eset\u00e9n nem z\u00e1rhat\u00f3 ki a lehet\u0151s\u00e9g, hogy vissza\u00e1ll\u00edts\u00e1k a titkos kulcsokat, amelyeket az RSA-CRT \u00e9s AES-NI algoritmusokkal t\u00f6rt\u00e9n\u0151 titkos\u00edt\u00e1shoz haszn\u00e1lnak. A technika haszn\u00e1lhat\u00f3 hib\u00e1k gener\u00e1l\u00e1s\u00e1ra is az eredetileg helyes algoritmusokban, hogy mem\u00f3riakezel\u00e9s sor\u00e1n sebezhet\u0151s\u00e9geket provok\u00e1ljanak, p\u00e9ld\u00e1ul a lefoglalt puffer hat\u00e1rain k\u00edv\u00fcli ter\u00fcletekhez val\u00f3 hozz\u00e1f\u00e9r\u00e9s megszervez\u00e9s\u00e9re.
\nA t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges k\u00f3d protot\u00edpusa megjelent<\/a><\/noindex> a GitHub-on<\/p>\n

A m\u00f3dszer l\u00e9nyege, hogy olyan k\u00f6r\u00fclm\u00e9nyeket teremtsenek, amelyek el\u0151re nem l\u00e1that\u00f3 adatorozd\u00e1sokat okoznak az SGX-ben v\u00e9gzett sz\u00e1m\u00edt\u00e1sok sor\u00e1n, amelyek v\u00e9delme \u00e9rdek\u00e9ben sem az adatok titkos\u00edt\u00e1s\u00e1nak, sem a mem\u00f3ria hiteles\u00edt\u00e9s\u00e9nek alkalmaz\u00e1sa nem ny\u00fajt v\u00e9delmet. A torz\u00edt\u00e1sok el\u0151id\u00e9z\u00e9s\u00e9re rendelkez\u00e9sre \u00e1llnak a rendszerek energiak\u00f6lts\u00e9geinek cs\u00f6kkent\u00e9s\u00e9re \u00e9s a maxim\u00e1lis teljes\u00edtm\u00e9ny aktiv\u00e1l\u00e1s\u00e1ra szolg\u00e1l\u00f3, \u00e1ltal\u00e1ban haszn\u00e1lt szoftveres interf\u00e9szek. A fesz\u00fclts\u00e9g- \u00e9s frekvenciatulajdons\u00e1gok az eg\u00e9sz chipet lefedik, bele\u00e9rtve az izol\u00e1lt k\u00f6rnyezetben v\u00e9gzett sz\u00e1m\u00edt\u00e1sok teljes\u00edtm\u00e9ny\u00e9t is. <\/p>\n

A fesz\u00fclts\u00e9g v\u00e1ltoztat\u00e1s\u00e1val olyan k\u00f6r\u00fclm\u00e9nyeket lehet teremteni, amelyekn\u00e9l a CPU-n bel\u00fcli mem\u00f3ria cella regener\u00e1l\u00e1s\u00e1hoz nem elegend\u0151 a t\u00f6lt\u00e9s, \u00e9s annak \u00e9rt\u00e9ke megv\u00e1ltozik. A t\u00e1mad\u00e1s kulcsfontoss\u00e1g\u00fa elt\u00e9r\u00e9se RowHammer<\/a><\/noindex> a RowHammer lehet\u0151v\u00e9 teszi, hogy megv\u00e1ltoztassuk a DRAM mem\u00f3ria egyes biteinek tartalm\u00e1t az\u00e1ltal, hogy ciklikusan olvassuk az adatokat a szomsz\u00e9dos cell\u00e1kb\u00f3l, m\u00edg a Plundervolt azt teszi lehet\u0151v\u00e9, hogy a bitek megv\u00e1ltozzanak a CPU-n bel\u00fcl, amikor az adatok m\u00e1r bet\u00f6lt\u0151dtek a mem\u00f3ri\u00e1b\u00f3l a sz\u00e1m\u00edt\u00e1sok v\u00e9grehajt\u00e1s\u00e1hoz. Ez a funkci\u00f3 lehet\u0151v\u00e9 teszi a SGX \u00e1ltal alkalmazott integrit\u00e1s-ellen\u0151rz\u00e9si \u00e9s titkos\u00edt\u00e1si mechanizmusok megker\u00fcl\u00e9s\u00e9t, mivel az \u00e9rt\u00e9kek a mem\u00f3ri\u00e1ban helyesek maradnak, de manipul\u00e1l\u00f3dhatnak, miel\u0151tt az eredm\u00e9ny visszaker\u00fcl a mem\u00f3ri\u00e1ba.<\/p>\n

Ha a m\u00f3dos\u00edtott \u00e9rt\u00e9ket a titkos\u00edt\u00e1si folyamat sor\u00e1n szorz\u00e1skor haszn\u00e1lj\u00e1k, akkor az eredm\u00e9nyk\u00e9nt kapott titkos sz\u00f6veg helytelen lesz. Mivel a t\u00e1mad\u00f3 hozz\u00e1f\u00e9rhet a SGX kezel\u0151h\u00f6z, hogy titkos\u00edtsa adatait, k\u00e9pes \u00e1ramkimarad\u00e1sok r\u00e9v\u00e9n statisztik\u00e1t felhalmozni a kimeneti titkos sz\u00f6veg v\u00e1ltoz\u00e1s\u00e1r\u00f3l, \u00e9s n\u00e9h\u00e1ny percen bel\u00fcl visszafejteni a rekeszben t\u00e1rolt kulcs \u00e9rt\u00e9k\u00e9t. A bemeneti sz\u00f6veg \u00e9s a helyes titkos sz\u00f6veg kimenete ismert, a kulcs nem v\u00e1ltozik, \u00e9s a helytelen titkos sz\u00f6veg kimeneti eredm\u00e9nye azt mutatja, hogy egy bit ellent\u00e9tes \u00e9rt\u00e9kre torzult. <\/p>\n

A k\u00fcl\u00f6nb\u00f6z\u0151 \u00e1ramkimarad\u00e1sok sor\u00e1n \u00f6sszegy\u0171jt\u00f6tt helyes \u00e9s torz\u00edtott titkos sz\u00f6vegek p\u00e1rjainak elemz\u00e9s\u00e9vel, a hiba differenci\u00e1lis elemz\u00e9si m\u00f3dszereivel (DFA, Differenci\u00e1lis Hibaelemz\u00e9s<\/a><\/noindex>) lehet el\u0151re jelezni<\/a><\/noindex> val\u00f3sz\u00edn\u0171 kulcsokat, amelyeket az AES szimmetrikus titkos\u00edt\u00e1shoz haszn\u00e1lnak, majd elemezve a kulcsok keresztmetszet\u00e9t a k\u00fcl\u00f6nb\u00f6z\u0151 k\u00e9szletekben, meghat\u00e1rozhatjuk a keresett kulcsot.<\/p>\n

\r\n \"Vide\u00f3\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

A probl\u00e9ma k\u00fcl\u00f6nb\u00f6z\u0151 Intel processzormodellekre vonatkozik, bele\u00e9rtve az 6-t\u00f3l 10-ig terjed\u0151 Intel Core CPU-kat, valamint az \u00f6t\u00f6dik \u00e9s hatodik gener\u00e1ci\u00f3s Xeon E3-at, az els\u0151 \u00e9s m\u00e1sodik gener\u00e1ci\u00f3s Intel Xeon Sk\u00e1l\u00e1zhat\u00f3 processzorokat, a Xeon D-t,
\n Xeon W-t \u00e9s Xeon E-t.
\nEml\u00e9keztet\u00fcnk arra, hogy az SGX technol\u00f3gia (<\/p>\n

Szoftver V\u00e9delmi Kiterjeszt\u00e9sek) a hatodik gener\u00e1ci\u00f3s Intel Core processzorokban (Skylake) jelent meg, \u00e9s<\/a><\/noindex>) megjelent az Intel Core hatodik gener\u00e1ci\u00f3s (Skylake) processzorokban \u00e9s aj\u00e1nlatot tesz<\/a><\/noindex> utasokat tartalmaz\u00f3 sorozat, amelyek lehet\u0151v\u00e9 teszik a felhaszn\u00e1l\u00f3i szint\u0171 alkalmaz\u00e1sok sz\u00e1m\u00e1ra z\u00e1rt mem\u00f3riater\u00fcletek \u2013 enkkl\u00e1v\u00e9k \u2013 kiemel\u00e9s\u00e9t. Ezek a ter\u00fcletek olyan inform\u00e1ci\u00f3kat tartalmaznak, amelyeket m\u00e9g a kernel \u00e9s a ring0, SMM \u00e9s VMM m\u00f3dban v\u00e9grehajtott k\u00f3d sem tud el\u00e9rni \u00e9s m\u00f3dos\u00edtani. Az ir\u00e1ny\u00edt\u00e1st a z\u00e1rt ter\u00fcleten bel\u00fcli k\u00f3dhoz hagyom\u00e1nyos ugr\u00e1si funkci\u00f3kkal \u00e9s regiszterekkel, valamint veremmanipul\u00e1ci\u00f3kkal nem lehet \u00e1tv\u00e1ltani \u2013 a control \u00e1tad\u00e1s\u00e1hoz egy k\u00fcl\u00f6n erre a c\u00e9lra l\u00e9trehozott \u00faj utas\u00edt\u00e1st alkalmaznak, amely ellen\u0151rzi az jogosults\u00e1gokat. Ek\u00f6zben a z\u00e1rt ter\u00fcleten elhelyezett k\u00f3d klasszikus h\u00edv\u00e1sm\u00f3dszereket alkalmazhat a z\u00e1rt ter\u00fclettel bel\u00fcli f\u00fcggv\u00e9nyekhez val\u00f3 hozz\u00e1f\u00e9r\u00e9shez, \u00e9s egy speci\u00e1lis utas\u00edt\u00e1st k\u00fcls\u0151 f\u00fcggv\u00e9nyek megh\u00edv\u00e1s\u00e1hoz. A hardveres t\u00e1mad\u00e1sok, p\u00e9ld\u00e1ul a DRAM modulhoz val\u00f3 csatlakoz\u00e1s elleni v\u00e9delem \u00e9rdek\u00e9ben az enkkl\u00e1v\u00e1k mem\u00f3ri\u00e1j\u00e1t titkos\u00edtj\u00e1k.<\/p>\n

<\/a><\/noindex><\/p>\n

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Intel \u0432\u044b\u043f\u0443\u0441\u0442\u0438\u043b\u0430 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u0434\u0430, \u0443\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0449\u0435\u0433\u043e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-14607), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0441 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u043e\u043c \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435\u043c \u0438 \u0447\u0430\u0441\u0442\u043e\u0442\u043e\u0439 \u0432 CPU \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0435 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u044f\u0447\u0435\u0435\u043a \u0441 \u0434\u0430\u043d\u043d\u044b\u043c\u0438, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u044f\u0445, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u043f\u0440\u0438 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f\u0445 \u0432 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0430\u043d\u043a\u043b\u0430\u0432\u0430\u0445 Intel SGX. \u0410\u0442\u0430\u043a\u0430 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 Plundervolt, \u0438 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0438\u0445 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0432\u044b\u0437\u0432\u0430\u0442\u044c […]<\/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-53866","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\udd47Plundervolt \u2014 \u00faj t\u00e1mad\u00e1si m\u00f3dszer az Intel processzorok ellen, amely a SGX technol\u00f3gi\u00e1t \u00e9rinti | ProHoster","description":"Az Intel v\u00e1llalat kiadott egy mikrok\u00f3dfriss\u00edt\u00e9st, amely megsz\u00fcnteti","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/plundervolt-novyj-metod-ataki-na-protsessory-intel-zatragivayushhij-tehnologiyu-sgx","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\udd47Plundervolt \u2014 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 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