{"id":27340,"date":"2016-03-11T14:22:08","date_gmt":"2016-03-11T13:22:08","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=27340"},"modified":"2023-02-27T14:19:31","modified_gmt":"2023-02-27T14:19:31","slug":"attacco-drown-alle-connessioni-ssl-tls","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/hosting\/attacco-drown-alle-connessioni-ssl-tls\/","title":{"rendered":"Nuovo attacco DROWN alle connessioni SSL\/TLS"},"content":{"rendered":"<p>Si torna a parlare di <strong>sicurezza in rete<\/strong> ed in particolare di una falla che pu\u00f2 potenzialmente causare seri danni a tutti quei web server che utilizzano protocollo TLS e che supportano SSL.<\/p>\n<p>\u00c8 importante mettere in chiaro fin da subito che la problematica non \u00e8 legata al <strong>protocollo TLS<\/strong> che rimane il metodo pi\u00f9 sicuro e pi\u00f9 utilizzato per garantire il trasferimento dati sul web.<\/p>\n<p>La falla \u00e8 legata al <strong>protocollo SSLv2<\/strong> che attualmente non \u00e8 quasi pi\u00f9 utilizzato (il governo USA ad esempio lo ha abbandonato circa 20 anni fa) ma che \u00e8 ancora supportato da diversi server in tutto il mondo a causa di alcune specifiche implementazioni TLS (tra cui figura anche OpenSSL).<\/p>\n<p>La modalit\u00e0 di attacco denominata <strong>DROWN (Decrypting RSA with Obsolete and Weakened eNcryption)<\/strong>, cercando di stabilire connessioni con i web server via SSLv2, permette di arrivare al decriptaggio ed all&#8217;intercettazione di connessioni TLS.<\/p>\n<p>Grazie ad un numero elevato di tentativi di connessione \u00e8 possibile ricavare un numero sufficiente di frammenti della chiave di cifratura per decriptarla e quindi avere accesso alle informazioni trasmesse.<\/p>\n<p>Per chi fosse appassionato di matematica: <em>&#8220;uno scenario tipico richiederebbe l&#8217;analisi di 1000 TLS handshake, l&#8217;inizializzazione di 40000 connessioni SSLv2 e 2^50 operazioni per decriptare informazioni cifrate con chiave RSA a 2048 bit&#8221;<\/em>.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2016\/03\/drown-example.jpg\" alt=\"DROWN TLS example\" width=\"618\" height=\"440\" class=\"aligncenter size-full wp-image-27343\" \/><\/p>\n<p>Questa modalit\u00e0 di attacco \u00e8 stata identificata da un <strong>team di ricerca internazionale<\/strong> formato da studiosi di Tel Aviv University, Munster University of Applied Sciences, Ruhr University of Bochum, University of Pennsylvania, University of Michigan e da esperti di Two Sigma, Google, Hashcat Project e OpenSSL Project.<\/p>\n<p>\u00c8 stato stimato che un attacco di questo tipo pu\u00f2 <strong>decriptare la chiave di cifratura<\/strong> in alcune ore o, nel migliore dei casi, in pochi minuti.<\/p>\n<p>Ovviamente il team che ha scoperto questa problematica ha provveduto a risolverla prima di rendere pubblica la notizia. In conseguenza di ci\u00f2 <strong>OpenSSL ha rilasciato un aggiornamento di sicurezza<\/strong> (versioni 1.0.1s oppure 1.0.2g) caldamente consigliato per tutti i colori i quali vogliano mettere al sicuro i loro server da possibili attacchi DROWN. Nonostante l&#8217;aggiornamento sia indispensabile, \u00e8 importante specificare che non risulta essere mai stato utilizzata la modalit\u00e0 di attacco DROWN sul web.<\/p>\n<p>Ultimo avvertimento: se esistono altri server che utilizzano la stessa chiave privata utilizzata sul vostro server e consentono le connessioni via SSLv2 allora potete essere vulnerabili. Spesso le aziende riutilizzano gli <strong>stessi certificati<\/strong> e le <strong>stesse chiavi<\/strong> su web server ed email server. In molti casi i mail server supportano SSLv2 e questo pu\u00f2 compromettere la sicurezza anche dei web server che non lo supportano.<\/p>\n<p>Per chi fosse interessato, \u00e8 disponibile un <a href=\"https:\/\/drownattack.com\/drown-attack-paper.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">documento tecnico<\/a> che spiega nel dettaglio il funzionamento di DROWN.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Si torna a parlare di <strong>sicurezza in rete<\/strong> ed in particolare di una falla che pu\u00f2 potenzialmente causare seri danni a tutti quei web server che utilizzano protocollo TLS e che supportano SSL.<\/p>\n","protected":false},"author":4,"featured_media":27344,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[32],"tags":[242,370,168,55,492],"class_list":["post-27340","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hosting","tag-hacker","tag-openssl","tag-server","tag-sicurezza","tag-ssltls"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - 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