{"id":52697,"date":"2019-11-14T00:00:00","date_gmt":"2019-11-13T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-tpm-fail-pozvolyayushhaya-vosstanovit-klyuchi-hranimye-v-tpm-modulyah"},"modified":"2020-02-18T14:00:29","modified_gmt":"2020-02-18T11:00:29","slug":"uyazvimost-tpm-fail-pozvolyayushhaya-vosstanovit-klyuchi-hranimye-v-tpm-modulyah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-tpm-fail-pozvolyayushhaya-vosstanovit-klyuchi-hranimye-v-tpm-modulyah","title":{"rendered":"A TPM-Fail sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi a TPM-modulokban t\u00e1rolt kulcsok helyre\u00e1ll\u00edt\u00e1s\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A Worcester Polytechnic Institute, L\u00fcbeck University \u00e9s a San Diego-i Kaliforniai Egyetem kutat\u00f3csoportja <noindex><a rel=\"nofollow\" href=\"http:\/\/tpm.fail\/tpmfail.pdf\">kifejlesztette<\/a><\/noindex> k\u00fcls\u0151 csatorn\u00e1kon alapul\u00f3 t\u00e1mad\u00e1si m\u00f3dszert dolgozott ki, amely lehet\u0151v\u00e9 teszi a TPM (Trusted Platform Module) t\u00e1rolt z\u00e1rt kulcsainak \u00e9rt\u00e9keinek vissza\u00e1ll\u00edt\u00e1s\u00e1t. A t\u00e1mad\u00e1s k\u00f3dnev\u00e9t kapta <noindex><a rel=\"nofollow\" href=\"http:\/\/tpm.fail\/\">TPM-Fail<\/a><\/noindex> \u00e9s \u00e9rinti az fTPM-et (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/support\/articles\/000007452\/mini-pcs.html\">szoftveres megval\u00f3s\u00edt\u00e1s<\/a><\/noindex> mikroprocesszoren fut\u00f3 firmware alap\u00fa, amely a CPU-n bel\u00fcl tal\u00e1lhat\u00f3) az Intel (CVE-2019-11090) \u00e1ltal, valamint a STMicroelectronics chipjein tal\u00e1lhat\u00f3 hardveres TPM-eket <noindex><a rel=\"nofollow\" href=\"https:\/\/www.st.com\/en\/secure-mcus\/st33tphf20i2c.html\">ST33<\/a><\/noindex> (CVE-2019-16863).<\/p>\n<p>A kutat\u00f3k <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/VernamGroup\/TPM-Fail\">k\u00f6zz\u00e9tett\u00e9k<\/a><\/noindex> protot\u00edpus eszk\u00f6zk\u00e9szletet mutattak be a t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1ra, \u00e9s demonstr\u00e1lt\u00e1k a 256 bites z\u00e1rt kulcs helyre\u00e1ll\u00edt\u00e1s\u00e1nak lehet\u0151s\u00e9g\u00e9t, amelyet az ECDSA \u00e9s az EC-Schnorr elliptikus g\u00f6rb\u00e9ken alapul\u00f3 algoritmusokkal digit\u00e1lis al\u00e1\u00edr\u00e1sok gener\u00e1l\u00e1s\u00e1hoz haszn\u00e1lnak. A jogosults\u00e1gokt\u00f3l f\u00fcgg\u0151en az Intel fTPM rendszerekn\u00e9l a t\u00e1mad\u00e1s teljes id\u0151tartama 4-20 perc, \u00e9s 1-15 ezer m\u0171velet elemz\u00e9s\u00e9t ig\u00e9nyli. A ST33 chippel rendelkez\u0151 rendszerek t\u00e1mad\u00e1s\u00e1hoz k\u00f6r\u00fclbel\u00fcl 80 percre \u00e9s k\u00f6r\u00fclbel\u00fcl 40 ezer digit\u00e1lis al\u00e1\u00edr\u00e1si m\u0171velet elemz\u00e9s\u00e9re van sz\u00fcks\u00e9g. <\/p>\n<p>A kutat\u00f3k azt is demonstr\u00e1lt\u00e1k, hogy lehet\u0151s\u00e9g van t\u00e1voli t\u00e1mad\u00e1sra nagy sebess\u00e9g\u0171 h\u00e1l\u00f3zatokban, amely lehet\u0151v\u00e9 tette egy 1GB s\u00e1vsz\u00e9less\u00e9g\u0171 helyi h\u00e1l\u00f3zaton a z\u00e1rt kulcs \u00f6t \u00f3r\u00e1n bel\u00fcli helyre\u00e1ll\u00edt\u00e1s\u00e1t, miut\u00e1n 45 ezer VPN-azonos\u00edt\u00f3 session v\u00e1laszidej\u00e9t m\u00e9rt\u00e9k a s\u00e9r\u00fcl\u00e9keny TPM-t\u00e1rol\u00f3 kulcsokat t\u00e1rol\u00f3 strongSwan szoftveres VPN szerverrel.<\/p>\n<p>A t\u00e1mad\u00e1s m\u00f3dszere a digit\u00e1lis al\u00e1\u00edr\u00e1sok gener\u00e1l\u00e1sa sor\u00e1n v\u00e9grehajtott m\u0171veletek v\u00e9grehajt\u00e1si id\u0151beli elt\u00e9r\u00e9seinek elemz\u00e9s\u00e9n alapul. A sz\u00e1m\u00edt\u00e1si k\u00e9sleltet\u00e9s \u00e9rt\u00e9kel\u00e9se lehet\u0151v\u00e9 teszi, hogy inform\u00e1ci\u00f3t nyerj\u00fcnk az egyes bitekr\u0151l az elliptikus g\u00f6rb\u00e9vel v\u00e9gzett sk\u00e1l\u00e1ros szorz\u00e1s sor\u00e1n. Az ECDSA eset\u00e9ben elegend\u0151 n\u00e9h\u00e1ny bit inform\u00e1ci\u00f3t nyerni az inicializ\u00e1l\u00f3 vektorr\u00f3l (nonce) a z\u00e1rt kulcs fokozatos helyre\u00e1ll\u00edt\u00e1s\u00e1hoz. A t\u00e1mad\u00e1s sikeres v\u00e9grehajt\u00e1s\u00e1hoz t\u00f6bb ezer digit\u00e1lis al\u00e1\u00edr\u00e1s gener\u00e1l\u00e1s\u00e1nak id\u0151\u00e9nek elemz\u00e9se sz\u00fcks\u00e9ges, amelyeket a t\u00e1mad\u00f3 \u00e1ltal ismert adatok f\u00f6l\u00f6tt hoznak l\u00e9tre.<\/p>\n<p>S\u00e9r\u00fcl\u00e9kenys\u00e9g <noindex><a rel=\"nofollow\" href=\"https:\/\/www.st.com\/content\/st_com\/en\/campaigns\/tpm-update.html\">eliminates<\/a><\/noindex> Az STMicroelectronics c\u00e9ggel k\u00e9sz\u00fclt \u00faj chipverzi\u00f3kban az ECDSA algoritmus megval\u00f3s\u00edt\u00e1sa mentes\u00fclt az oper\u00e1ci\u00f3s id\u0151b\u0151l ered\u0151 korrel\u00e1ci\u00f3kt\u00f3l. \u00c9rdekes m\u00f3don az STMicroelectronics \u00e9rintett chipjeit haszn\u00e1lj\u00e1k a Common Criteria (CC) EAL 4+ biztons\u00e1gi szintnek megfelel\u0151 berendez\u00e9sekben is. A kutat\u00f3k az Infineon \u00e9s Nuvoton TP-chipjeit is ellen\u0151rizt\u00e9k, de ezekn\u00e9l nem tapasztaltak id\u0151tartam-v\u00e1ltoz\u00e1sb\u00f3l ered\u0151 kisziv\u00e1rg\u00e1st.<\/p>\n<p>Az Intel processzorok eset\u00e9ben a probl\u00e9ma 2013-t\u00f3l megjelent Haswell csal\u00e1d kiad\u00e1s\u00e1val kezd\u0151d\u00f6tt. Megjegyzik, hogy a probl\u00e9m\u00e1s term\u00e9kek sz\u00e9les spektrum\u00e1t \u00e9rinti a k\u00fcl\u00f6nb\u00f6z\u0151 gy\u00e1rt\u00f3k \u00e1ltal el\u0151\u00e1ll\u00edtott laptopok, PC-k \u00e9s szerverek, bele\u00e9rtve a Dell, Lenovo \u00e9s HP term\u00e9keit.<\/p>\n<p>Az Intel c\u00e9g jav\u00edt\u00e1st integr\u00e1lt <noindex><a rel=\"nofollow\" href=\"https:\/\/blogs.intel.com\/technology\/2019\/11\/ipas-november-2019-intel-platform-update-ipu\/\">novemberi<\/a><\/noindex> firmware-friss\u00edt\u00e9s\u00e9be, amely nemcsak a sz\u00f3ban forg\u00f3 probl\u00e9m\u00e1t orvosolja, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/security-center\/advisory\/intel-sa-00241.html\">hanem<\/a><\/noindex> 24 tov\u00e1bbi sebezhet\u0151s\u00e9get is, ezek k\u00f6z\u00fcl kilencet magas, egyet pedig kritikus szint\u0171 vesz\u00e9lyess\u00e9ggel jel\u00f6ltek. A megadott probl\u00e9m\u00e1kr\u00f3l csak \u00e1ltal\u00e1nos inform\u00e1ci\u00f3k \u00e1llnak rendelkez\u00e9sre, p\u00e9ld\u00e1ul eml\u00edt\u00e9st nyer, hogy a kritikus sebezhet\u0151s\u00e9g (CVE-2019-0169) lehet\u0151s\u00e9get ad a heap overflow kihaszn\u00e1l\u00e1s\u00e1ra az Intel CSME (Converged Security and Management Engine) \u00e9s Intel TXE (Trusted Execution Engine) k\u00f6rnyezeteiben, ami lehet\u0151v\u00e9 teszi a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra, hogy privil\u00e9giumokat szerezzen, \u00e9s hozz\u00e1f\u00e9rjen bizalmas adatokhoz.<\/p>\n<p>Emellett \u00e9rdemes megeml\u00edteni <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jovanbulck\/0xbadc0de\">a<\/a><\/noindex> k\u00fcl\u00f6nb\u00f6z\u0151 SDK-k auditj\u00e1nak <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/intel\/linux-sgx\">Intel SGX-SDK<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/lsds\/sgx-lkl\">SGX-LKL<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/openenclave.io\/sdk\/\">Microsoft OpenEnclave<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/grapheneproject.io\/\">Graphene<\/a><\/noindex>,<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/fortanix.com\/products\/runtime-encryption\/edp\/\">Rust-EDP<\/a><\/noindex> \u00e9s <noindex><a rel=\"nofollow\" href=\"https:\/\/cloud.google.com\/blog\/products\/gcp\/introducing-asylo-an-open-source-framework-for-confidential-computing\">Google Asylo<\/a><\/noindex> Intel SGX-hez, <noindex><a rel=\"nofollow\" href=\"https:\/\/keystone-enclave.org\/\">Keystone<\/a><\/noindex>  RISC-V-hez \u00e9s <noindex><a rel=\"nofollow noopener noreferrer\" href=\"https:\/\/distrinet.cs.kuleuven.be\/software\/sancus\/\" target=\"_blank\">Sancus<\/a><\/noindex> Sancus TEE-hez. Az audit sor\u00e1n <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jovanbulck\/0xbadc0de\/blob\/master\/ccs19-tale.pdf\">felfedezve<\/a><\/noindex> 35 sebezhet\u0151s\u00e9get tal\u00e1ltak, amelyek alapj\u00e1n t\u00f6bb t\u00e1mad\u00e1si forgat\u00f3k\u00f6nyv ker\u00fclt kidolgoz\u00e1sra, lehet\u0151v\u00e9 t\u00e9ve az AES kulcsok kinyer\u00e9s\u00e9t az enclave-b\u0151l, vagy az\u00e1ltal, hogy lehet\u0151s\u00e9get biztos\u00edtanak a mem\u00f3riatartalom megs\u00e9rt\u00e9s\u00e9re.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/raw.githubusercontent.com\/jovanbulck\/0xbadc0de\/master\/thumbnail.jpg\"><img decoding=\"async\" alt=\"A TPM-Fail sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi a TPM-modulokban t\u00e1rolt kulcsok helyre\u00e1ll\u00edt\u00e1s\u00e1t\" src=\"\/wp-content\/uploads\/2019\/11\/4c83ec77b9618ac531060dc585820d32.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51862\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0412\u0443\u0441\u0442\u0435\u0440\u0441\u043a\u043e\u0433\u043e \u043f\u043e\u043b\u0438\u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0438\u043d\u0441\u0442\u0438\u0442\u0443\u0442\u0430, \u041b\u044e\u0431\u0435\u043a\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0438 \u041a\u0430\u043b\u0438\u0444\u043e\u0440\u043d\u0438\u0439\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432 \u0421\u0430\u043d-\u0414\u0438\u0435\u0433\u043e \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0430 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0445 \u043a\u043b\u044e\u0447\u0435\u0439, \u0445\u0440\u0430\u043d\u0438\u043c\u044b\u0445 \u0432 TPM (Trusted Platform Module). \u0410\u0442\u0430\u043a\u0430 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f TPM-Fail \u0438 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 fTPM (\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u0430\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0448\u0438\u0432\u043a\u0438, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0430\u044f \u043d\u0430 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u043c \u043c\u0438\u043a\u0440\u043e\u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0435 \u0432\u043d\u0443\u0442\u0440\u0438 CPU) \u043e\u0442 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Intel (CVE-2019-11090) \u0438 \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u044b\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":52698,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-52697","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=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0412\u0443\u0441\u0442\u0435\u0440\u0441\u043a\u043e\u0433\u043e \u043f\u043e\u043b\u0438\u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0438\u043d\u0441\u0442\u0438\u0442\u0443\u0442\u0430, \u041b\u044e\u0431\u0435\u043a\u0441\u043a\u043e\u0433\u043e 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