{"id":35693,"date":"2019-10-31T22:05:48","date_gmt":"2019-10-31T19:05:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-amd-sev-pozvolyayushhaya-opredelit-klyuchi-shifrovaniya\/"},"modified":"2019-10-31T22:05:48","modified_gmt":"2019-10-31T19:05:48","slug":"uyazvimost-v-amd-sev-pozvolyayushhaya-opredelit-klyuchi-shifrovaniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-amd-sev-pozvolyayushhaya-opredelit-klyuchi-shifrovaniya","title":{"rendered":"Vulnerabilit\u00e0 in AMD SEV che consente di determinare le chiavi di crittografia.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Sviluppatori del team Google Cloud <noindex><a rel=\"nofollow\" href=\"https:\/\/seclists.org\/fulldisclosure\/2019\/Jun\/46\">hanno identificato<\/a><\/noindex> vulnerabilit\u00e0 (CVE-2019-9836) nell'implementazione della tecnologia AMD SEV (Secure Encrypted Virtualization), che consente di compromettere i dati protetti tramite questa tecnologia. AMD SEV garantisce a livello hardware una crittografia trasparente della memoria delle macchine virtuali, con accesso ai dati decriptati riservato solo al sistema operativo ospite in uso, mentre le altre macchine virtuali e l'ipervisor ricevono un insieme di dati criptati quando tentano di accedere a tale memoria.<\/p>\n<p>Il problema individuato consente di recuperare completamente il contenuto della chiave PDH riservata, gestita a livello di un processore di sicurezza protetto PSP (AMD Security Processor), che non \u00e8 accessibile al sistema operativo principale.<br \/>\nPossedendo la chiave PDH, l'attaccante pu\u00f2 quindi recuperare la chiave di sessione e la sequenza segreta impostate durante la creazione della macchina virtuale, ottenendo accesso ai dati crittografati. <\/p>\n<p>La vulnerabilit\u00e0 \u00e8 causata da carenze nell'implementazione delle curve ellittiche (ECC) utilizzate per la crittografia, che permettono di effettuare <noindex><a rel=\"nofollow\" href=\"https:\/\/web-in-security.blogspot.com\/2015\/09\/practical-invalid-curve-attacks.html\">un attacco<\/a><\/noindex> per il ripristino dei parametri della curva. Durante l'esecuzione del comando per l'avvio di una macchina virtuale protetta, l'attaccante pu\u00f2 inviare parametri della curva che non corrispondono a quelli raccomandati dal NIST, portando all'uso di valori di punti di basso ordine nelle operazioni di moltiplicazione con i dati della chiave privata. <\/p>\n<p>La sicurezza del protocollo ECDH \u00e8 direttamente <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%AD%D0%BB%D0%BB%D0%B8%D0%BF%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F_%D0%BA%D1%80%D0%B8%D0%BF%D1%82%D0%BE%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D1%8F\">legata<\/a><\/noindex> da <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9F%D0%BE%D1%80%D1%8F%D0%B4%D0%BE%D0%BA_%D0%B3%D1%80%D1%83%D0%BF%D0%BF%D1%8B\">all'ordine<\/a><\/noindex> del punto iniziale generato, il cui logaritmo discreto rappresenta un compito molto complesso. In uno dei passaggi di inizializzazione dell'ambiente AMD SEV, nei calcoli con la chiave privata vengono utilizzati parametri forniti dall'utente. In effetti, viene eseguita un'operazione di moltiplicazione di due punti, uno dei quali corrisponde alla chiave privata. Se il secondo punto \u00e8 associato a numeri primi di basso ordine, l'attaccante pu\u00f2 determinare i parametri del primo punto (i bit del modulo utilizzato nell'operazione di elevamento a potenza modulo) attraverso la ricerca di tutti i valori possibili. Per determinare la chiave privata, i frammenti di numeri primi scelti possono quindi essere uniti tramite <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9A%D0%B8%D1%82%D0%B0%D0%B9%D1%81%D0%BA%D0%B0%D1%8F_%D1%82%D0%B5%D0%BE%D1%80%D0%B5%D0%BC%D0%B0_%D0%BE%D0%B1_%D0%BE%D1%81%D1%82%D0%B0%D1%82%D0%BA%D0%B0%D1%85\">il Teorema Cinese dei Resti<\/a><\/noindex>.<\/p>\n<p>Le piattaforme server AMD EPYC sono vulnerabili, utilizzando firmware SEV fino alla versione 0.17 build 11. AMD ha gi\u00e0  <noindex>ha pubblicato<\/noindex> rilasciato un aggiornamento del firmware che aggiunge il blocco dell'uso di punti non conformi alla curva NIST. Pertanto, i certificati generati in precedenza per le chiavi PDH rimangono validi, consentendo a un attaccante di eseguire un attacco di migrazione delle macchine virtuali da ambienti protetti da questa vulnerabilit\u00e0 a quelli vulnerabili. Si menziona anche la possibilit\u00e0 di un attacco di rollback su versioni di firmware precedenti vulnerabili, ma questa possibilit\u00e0 non \u00e8 ancora confermata.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50969\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0438\u0437 \u043a\u043e\u043c\u0430\u043d\u0434\u044b Google Cloud \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-9836) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 AMD SEV (Secure Encrypted Virtualization), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u044b\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0434\u0430\u043d\u043d\u043e\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0435. AMD SEV \u043d\u0430 \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u043c \u0443\u0440\u043e\u0432\u043d\u0435 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442 \u043f\u0440\u043e\u0437\u0440\u0430\u0447\u043d\u043e\u0435 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d, \u043f\u0440\u0438 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0440\u0430\u0441\u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u0434\u0430\u043d\u043d\u044b\u043c \u0438\u043c\u0435\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u0442\u0435\u043a\u0443\u0449\u0430\u044f \u0433\u043e\u0441\u0442\u0435\u0432\u0430\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0430, \u0430 \u043e\u0441\u0442\u0430\u043b\u044c\u043d\u044b\u0435 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0435 \u043c\u0430\u0448\u0438\u043d\u044b \u0438 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440 \u043f\u0440\u0438 \u043f\u043e\u043f\u044b\u0442\u043a\u0435 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u044f [&hellip;]<\/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-35693","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0438\u0437 \u043a\u043e\u043c\u0430\u043d\u0434\u044b Google Cloud \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-9836) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 AMD SEV (Secure Encrypted Virtualization), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u044b\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0434\u0430\u043d\u043d\u043e\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0435. 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AMD SEV fornisce a livello hardware una crittografia trasparente della memoria delle macchine virtuali, in cui solo il sistema operativo guest attuale ha accesso ai dati decrittografati, mentre le altre macchine virtuali e l'hypervisor, nel tentativo di accedere","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-amd-sev-pozvolyayushhaya-opredelit-klyuchi-shifrovaniya","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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 \u0432 AMD SEV, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u043a\u043b\u044e\u0447\u0438 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u044f | ProHoster","og:description":"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0438\u0437 \u043a\u043e\u043c\u0430\u043d\u0434\u044b Google Cloud \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-9836) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 AMD SEV (Secure Encrypted Virtualization), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u044b\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0434\u0430\u043d\u043d\u043e\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0435. 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