{"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\/pt\/blog\/news\/uyazvimost-tpm-fail-pozvolyayushhaya-vosstanovit-klyuchi-hranimye-v-tpm-modulyah","title":{"rendered":"Vulnerabilidade TPM-Fail, que permite a recupera\u00e7\u00e3o de chaves armazenadas em m\u00f3dulos TPM.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Um grupo de pesquisadores do Instituto Polit\u00e9cnico de Worcester, da Universidade de L\u00fcbeck e da Universidade da Calif\u00f3rnia em San Diego desenvolveu<\/a><\/noindex> desenvolveu um m\u00e9todo de ataque por canal lateral que permite recuperar o valor de chaves privadas armazenadas no TPM (Trusted Platform Module). O ataque recebeu o nome de c\u00f3digo TPM-Fail<\/a><\/noindex> e envolve fTPM (uma implementa\u00e7\u00e3o de software<\/a><\/noindex> baseada em firmware, que opera em um microprocessador separado dentro do CPU) da Intel (CVE-2019-11090) e TPMs de hardware em chips da STMicroelectronics ST33<\/a><\/noindex> (CVE-2019-16863).<\/p>\n

Os pesquisadores publicaram<\/a><\/noindex> prototiparam ferramentas para realizar o ataque e demonstraram a capacidade de recuperar uma chave privada de 256 bits, utilizada para a gera\u00e7\u00e3o de assinaturas digitais usando algoritmos baseados em curvas el\u00edpticas ECDSA e EC-Schnorr. Dependendo dos privil\u00e9gios de acesso, o tempo total do ataque em sistemas Intel fTPM varia de 4 a 20 minutos e requer a an\u00e1lise de 1 a 15 mil opera\u00e7\u00f5es. Para atacar sistemas com o chip ST33, leva cerca de 80 minutos e exige a an\u00e1lise de aproximadamente 40 mil opera\u00e7\u00f5es de gera\u00e7\u00e3o de assinaturas digitais. <\/p>\n

Os pesquisadores tamb\u00e9m demonstraram a viabilidade de um ataque remoto em redes de alta velocidade, que em um ambiente de laborat\u00f3rio com largura de banda de 1GB, conseguiu recuperar a chave privada em cinco horas, ap\u00f3s medir o tempo de resposta para 45 mil sess\u00f5es de autentica\u00e7\u00e3o com um servidor VPN baseado no software strongSwan, que armazena suas chaves em um TPM vulner\u00e1vel.<\/p>\n

O m\u00e9todo de ataque \u00e9 baseado na an\u00e1lise das diferen\u00e7as nos tempos de execu\u00e7\u00e3o das opera\u00e7\u00f5es durante a gera\u00e7\u00e3o de assinaturas digitais. A estimativa do atraso nas computa\u00e7\u00f5es permite determinar informa\u00e7\u00f5es sobre bits individuais durante o processo de multiplica\u00e7\u00e3o escalar em opera\u00e7\u00f5es com curvas el\u00edpticas. Para ECDSA, identificar at\u00e9 mesmo alguns bits com informa\u00e7\u00f5es sobre o vetor de inicializa\u00e7\u00e3o (nonce) \u00e9 suficiente para realizar um ataque de recupera\u00e7\u00e3o sequencial de toda a chave privada. Para um ataque bem-sucedido, \u00e9 necess\u00e1rio analisar o tempo de gera\u00e7\u00e3o de v\u00e1rias milhares de assinaturas digitais criadas com dados conhecidos pelo atacante.<\/p>\n

Vulnerabilidade no lan\u00e7amento<\/a><\/noindex> a STMicroelectronics com uma nova edi\u00e7\u00e3o de chips, onde a implementa\u00e7\u00e3o do algoritmo ECDSA foi desvinculada de correla\u00e7\u00f5es com o tempo de execu\u00e7\u00e3o das opera\u00e7\u00f5es. Curiosamente, os chips da STMicroelectronics afetados pelo problema s\u00e3o utilizados em equipamentos que atendem ao n\u00edvel de seguran\u00e7a CommonCriteria (CC) EAL 4+. Os pesquisadores tamb\u00e9m examinaram chips TPM das empresas Infineon e Nuvoton, mas neles n\u00e3o h\u00e1 vazamento baseado em mudan\u00e7as nos tempos de c\u00e1lculo.<\/p>\n

Nos processadores Intel, o problema se manifesta a partir da linha Haswell, lan\u00e7ada em 2013. \u00c9 observado que uma ampla gama de notebooks, PCs e servidores fabricados por v\u00e1rios fabricantes, incluindo Dell, Lenovo e HP, est\u00e1 vulner\u00e1vel.<\/p>\n

A Intel incluiu uma corre\u00e7\u00e3o em novembro<\/a><\/noindex> no pacote de atualiza\u00e7\u00f5es de firmware, que, al\u00e9m do problema em quest\u00e3o, foram corrigidas<\/a><\/noindex> tamb\u00e9m cont\u00e9m 24 vulnerabilidades, das quais nove foram classificadas como de alto risco e uma como cr\u00edtica. Para os problemas mencionados, apenas informa\u00e7\u00f5es gerais s\u00e3o fornecidas, como, por exemplo, a men\u00e7\u00e3o de que a vulnerabilidade cr\u00edtica (CVE-2019-0169) \u00e9 causada pela possibilidade de causar um estouro de buffer nos ambientes Intel CSME (Converged Security and Management Engine) e Intel TXE (Trusted Execution Engine), permitindo que um invasor eleve suas permiss\u00f5es e acesse dados confidenciais.<\/p>\n

Tamb\u00e9m pode ser destacado de informa\u00e7\u00f5es sobre vulnerabilidades e dissemina\u00e7\u00e3o de corre\u00e7\u00f5es,<\/a><\/noindex> resultados de auditoria de v\u00e1rias SDKs para desenvolvimento de aplicativos que interagem com o c\u00f3digo executado em enclaves isolados. Com o intuito de identificar fun\u00e7\u00f5es problem\u00e1ticas que possam ser utilizadas para realizar ataques, foram estudadas oito SDKs: Intel SGX-SDK<\/a><\/noindex>, SGX-LKL<\/a><\/noindex>, Microsoft OpenEnclave<\/a><\/noindex>, Graphene<\/a><\/noindex>,
\nRust-EDP<\/a><\/noindex> e Google Asylo<\/a><\/noindex> para Intel SGX, Keystone<\/a><\/noindex> para RISC-V e Sancus<\/a><\/noindex> para Sancus TEE. Durante a auditoria foram encontradas identificado<\/a><\/noindex> 35 vulnerabilidades, a partir das quais foram desenvolvidos v\u00e1rios cen\u00e1rios de ataque, permitindo a extra\u00e7\u00e3o de chaves AES do enclave ou a execu\u00e7\u00e3o de c\u00f3digo pr\u00f3prio atrav\u00e9s da cria\u00e7\u00e3o de condi\u00e7\u00f5es que danificam o conte\u00fado da mem\u00f3ria.<\/p>\n

\"Vulnerabilidade<\/a><\/noindex><\/center><\/p>\n

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

Fonte: 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 \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 […]<\/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\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\udd47Vulnerabilidade TPM-Fail, permitindo a recupera\u00e7\u00e3o de chaves armazenadas em m\u00f3dulos TPM | ProHoster","description":"Um grupo de pesquisadores do Instituto Polit\u00e9cnico de Worcester, da Universidade de L\u00fcbeck e da Universidade da Calif\u00f3rnia em San Diego","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-tpm-fail-pozvolyayushhaya-vosstanovit-klyuchi-hranimye-v-tpm-modulyah","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pt_PT","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c TPM-Fail, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u043a\u043b\u044e\u0447\u0438, \u0445\u0440\u0430\u043d\u0438\u043c\u044b\u0435 \u0432 TPM-\u043c\u043e\u0434\u0443\u043b\u044f\u0445 | 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 \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","og:url":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-tpm-fail-pozvolyayushhaya-vosstanovit-klyuchi-hranimye-v-tpm-modulyah","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2019-11-13T21:00:00+00:00","article:modified_time":"2020-02-18T11:00:29+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"52697","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-01-24 04:30:19","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-02-28 20:38:25","updated":"2026-01-24 04:30:19","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/52697","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/comments?post=52697"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/52697\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/media\/52698"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/media?parent=52697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/categories?post=52697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/tags?post=52697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}