{"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\/cs\/blog\/news\/uyazvimost-tpm-fail-pozvolyayushhaya-vosstanovit-klyuchi-hranimye-v-tpm-modulyah","title":{"rendered":"Zranitelnost TPM-Fail, kter\u00e1 umo\u017e\u0148uje obnovit kl\u00ed\u010de ulo\u017een\u00e9 v modulech TPM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Skupina v\u00fdzkumn\u00edk\u016f z Worcester Polytechnic Institute, L\u00fcbeck University a University of California, San Diego. <noindex><a rel=\"nofollow\" href=\"http:\/\/tpm.fail\/tpmfail.pdf\">vyvinula<\/a><\/noindex> metoda \u00fatoku p\u0159es vedlej\u0161\u00ed kan\u00e1ly, kter\u00e1 umo\u017e\u0148uje obnovit hodnotu priv\u00e1tn\u00edch kl\u00ed\u010d\u016f ulo\u017een\u00fdch v TPM (Trusted Platform Module). \u00datok dostal k\u00f3dov\u00e9 jm\u00e9no <noindex><a rel=\"nofollow\" href=\"http:\/\/tpm.fail\/\">TPM-Fail<\/a><\/noindex> a zahrnuje fTPM (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/support\/articles\/000007452\/mini-pcs.html\">softwarov\u00e1 implementace<\/a><\/noindex> na b\u00e1zi firmwaru, kter\u00fd b\u011b\u017e\u00ed na samostatn\u00e9m mikroprocesoru uvnit\u0159 CPU) od spole\u010dnosti Intel (CVE-2019-11090) a hardwarov\u00e9 TPM na \u010dipech STMicroelectronics. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.st.com\/en\/secure-mcus\/st33tphf20i2c.html\">ST33<\/a><\/noindex> (CVE-2019-16863).<\/p>\n<p>V\u00fdzkumn\u00edci <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/VernamGroup\/TPM-Fail\">publikovali<\/a><\/noindex> prototyp n\u00e1stroje pro proveden\u00ed \u00fatoku a demonstrovali mo\u017enost obnovy 256bitov\u00e9ho priv\u00e1tn\u00edho kl\u00ed\u010de, kter\u00fd se pou\u017e\u00edv\u00e1 pro vytv\u00e1\u0159en\u00ed digit\u00e1ln\u00edch podpis\u016f s vyu\u017eit\u00edm algoritm\u016f na b\u00e1zi eliptick\u00fdch k\u0159ivek ECDSA a EC-Schnorr. V z\u00e1vislosti na p\u0159\u00edstupov\u00fdch pr\u00e1vech je celkov\u00fd \u010das \u00fatoku na syst\u00e9my Intel fTPM 4-20 minut a vy\u017eaduje anal\u00fdzu 1-15 tis\u00edc operac\u00ed. Pro \u00fatok na syst\u00e9my s \u010dipem ST33 je pot\u0159eba p\u0159ibli\u017en\u011b 80 minut a anal\u00fdza p\u0159ibli\u017en\u011b 40 tis\u00edc operac\u00ed pro generov\u00e1n\u00ed digit\u00e1ln\u00edho podpisu. <\/p>\n<p>V\u00fdzkumn\u00edci tak\u00e9 demonstrovali mo\u017enost proveden\u00ed vzd\u00e1len\u00e9ho \u00fatoku v rychl\u00fdch s\u00edt\u00edch, kter\u00fd umo\u017enil v m\u00edstn\u00ed s\u00edti s propustnost\u00ed 1 GB v laboratorn\u00edch podm\u00ednk\u00e1ch b\u011bhem p\u011bti hodin obnovit priv\u00e1tn\u00ed kl\u00ed\u010d, po m\u011b\u0159en\u00ed doby odezvy pro 45 tis\u00edc autentiza\u010dn\u00edch relac\u00ed s VPN serverem zalo\u017een\u00fdm na softwaru strongSwan, kter\u00fd uchov\u00e1v\u00e1 sv\u00e9 kl\u00ed\u010de v zraniteln\u00e9m TPM.<\/p>\n<p>Metoda \u00fatoku se zakl\u00e1d\u00e1 na anal\u00fdze rozd\u00edl\u016f v \u010dase prov\u00e1d\u011bn\u00ed operac\u00ed p\u0159i generov\u00e1n\u00ed digit\u00e1ln\u00edho podpisu. Odhad zpo\u017ed\u011bn\u00ed p\u0159i prov\u00e1d\u011bn\u00ed v\u00fdpo\u010dt\u016f umo\u017e\u0148uje ur\u010dit informace o jednotliv\u00fdch bitech b\u011bhem prov\u00e1d\u011bn\u00ed n\u00e1soben\u00ed skalaru p\u0159i operac\u00edch s eliptickou k\u0159ivkou. Pro ECDSA je k ur\u010den\u00ed i n\u011bkolika bit\u016f s informacemi o vektorov\u00e9m inicializ\u00e1toru (nonce) dostate\u010dn\u00e9 k proveden\u00ed \u00fatoku na sekven\u010dn\u00ed obnovu cel\u00e9ho priv\u00e1tn\u00edho kl\u00ed\u010de. Pro \u00fasp\u011b\u0161n\u00e9 proveden\u00ed \u00fatoku je t\u0159eba analyzovat \u010das generov\u00e1n\u00ed n\u011bkolika tis\u00edc digit\u00e1ln\u00edch podpis\u016f vytvo\u0159en\u00fdch nad daty zn\u00e1m\u00fdmi \u00fato\u010dn\u00edkovi.<\/p>\n<p>Zranitelnost <noindex><a rel=\"nofollow\" href=\"https:\/\/www.st.com\/content\/st_com\/en\/campaigns\/tpm-update.html\">odstran\u011bna<\/a><\/noindex> spole\u010dnosti STMicroelectronics v nov\u00e9 verzi \u010dip\u016f, ve kter\u00fdch byla implementace algoritmu ECDSA zbavena korelac\u00ed s \u010dasem prov\u00e1d\u011bn\u00ed operac\u00ed. Zaj\u00edmav\u00e9 je, \u017ee \u010dipy STMicroelectronics n\u00e1chyln\u00e9 k probl\u00e9mu se rovn\u011b\u017e pou\u017e\u00edvaj\u00ed v za\u0159\u00edzen\u00edch spl\u0148uj\u00edc\u00edch \u00farove\u0148 bezpe\u010dnosti CommonCriteria (CC) EAL 4+. V\u00fdzkumn\u00edci tak\u00e9 prov\u011b\u0159ili TPM \u010dipy od spole\u010dnost\u00ed Infineon a Nuvoton, av\u0161ak u nich chyb\u00ed \u00fanik na z\u00e1klad\u011b zm\u011bny \u010dasu v\u00fdpo\u010dt\u016f.<\/p>\n<p>U procesor\u016f Intel se probl\u00e9m projevuje od vyd\u00e1n\u00ed rodiny Haswell, kter\u00e1 se vyr\u00e1b\u00ed od roku 2013. Bylo zji\u0161t\u011bno, \u017ee je posti\u017eeno \u0161irok\u00e9 spektrum notebook\u016f, PC a server\u016f vyr\u00e1b\u011bn\u00fdch r\u016fzn\u00fdmi v\u00fdrobci, v\u010detn\u011b Dell, Lenovo a HP.<\/p>\n<p>Spole\u010dnost Intel zahrnula opravu do <noindex><a rel=\"nofollow\" href=\"https:\/\/blogs.intel.com\/technology\/2019\/11\/ipas-november-2019-intel-platform-update-ipu\/\">listopadov\u00e9ho<\/a><\/noindex> aktualizac\u00ed firmwaru, ve kter\u00e9 krom\u011b zmi\u0148ovan\u00e9ho probl\u00e9mu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/security-center\/advisory\/intel-sa-00241.html\">bylo odstran\u011bno<\/a><\/noindex> tak\u00e9 24 zranitelnost\u00ed, z nich\u017e dev\u00edti byl p\u0159id\u011blen vysok\u00fd stupe\u0148 nebezpe\u010dnosti a jedn\u00e9 kritick\u00fd. U zm\u00edn\u011bn\u00fdch probl\u00e9m\u016f je uvedena pouze obecn\u00e1 informace, nap\u0159\u00edklad je zm\u00edn\u011bno, \u017ee kritick\u00e1 zranitelnost (CVE-2019-0169) je zp\u016fsobena mo\u017enost\u00ed vyvolat p\u0159ete\u010den\u00ed z\u00e1sobn\u00edku na stran\u011b prost\u0159ed\u00ed Intel CSME (Converged Security and Management Engine) a Intel TXE (Trusted Execution Engine), co\u017e umo\u017e\u0148uje \u00fato\u010dn\u00edkovi zv\u00fd\u0161it sv\u00e9 opr\u00e1vn\u011bn\u00ed a z\u00edskat p\u0159\u00edstup k d\u016fv\u011brn\u00fdm informac\u00edm.<\/p>\n<p>Tak\u00e9 stoj\u00ed za zm\u00ednku <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jovanbulck\/0xbadc0de\">odhalen\u00ed<\/a><\/noindex> v\u00fdsledk\u016f auditu r\u016fzn\u00fdch SDK pro v\u00fdvoj aplikac\u00ed, kter\u00e9 interaguj\u00ed s k\u00f3dem prov\u00e1d\u011bn\u00fdm na stran\u011b izolovan\u00fdch enkl\u00e1v. S c\u00edlem odhalit problematick\u00e9 funkce, kter\u00e9 mohou b\u00fdt pou\u017eity k prov\u00e1d\u011bn\u00ed \u00fatok\u016f, bylo prozkoum\u00e1no osm SDK: <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> a <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> pro Intel SGX, <noindex><a rel=\"nofollow\" href=\"https:\/\/keystone-enclave.org\/\">Keystone<\/a><\/noindex>  pro RISC-V a <noindex><a rel=\"nofollow noopener noreferrer\" href=\"https:\/\/distrinet.cs.kuleuven.be\/software\/sancus\/\" target=\"_blank\">Sancus<\/a><\/noindex> pro Sancus TEE. V pr\u016fb\u011bhu auditu bylo <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jovanbulck\/0xbadc0de\/blob\/master\/ccs19-tale.pdf\">odhaleno<\/a><\/noindex> 35 zranitelnost\u00ed, na jejich\u017e z\u00e1klad\u011b bylo vyvinuto n\u011bkolik sc\u00e9n\u00e1\u0159\u016f \u00fatok\u016f, kter\u00e9 umo\u017e\u0148uj\u00ed extrahovat AES kl\u00ed\u010de z enkl\u00e1vy nebo organizovat prov\u00e1d\u011bn\u00ed vlastn\u00edho k\u00f3du t\u00edm, \u017ee se vytvo\u0159\u00ed podm\u00ednky pro po\u0161kozen\u00ed obsahu pam\u011bti.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/raw.githubusercontent.com\/jovanbulck\/0xbadc0de\/master\/thumbnail.jpg\"><img decoding=\"async\" alt=\"Zranitelnost TPM-Fail, kter\u00e1 umo\u017e\u0148uje obnovit kl\u00ed\u010de ulo\u017een\u00e9 v modulech TPM\" 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>Zdroj: <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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