{"id":101430,"date":"2021-09-26T22:22:36","date_gmt":"2021-09-26T20:22:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-8-s-otklyucheniem-podderzhki-czifrovyh-podpisej-rsa-sha"},"modified":"2021-09-26T22:22:36","modified_gmt":"2021-09-26T20:22:36","slug":"reliz-openssh-8-8-s-otklyucheniem-podderzhki-czifrovyh-podpisej-rsa-sha","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/reliz-openssh-8-8-s-otklyucheniem-podderzhki-czifrovyh-podpisej-rsa-sha","title":{"rendered":"Rilascio di OpenSSH 8.8 con disabilitazione del supporto per le firme digitali rsa-sha","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata pubblicata la versione di OpenSSH 8.8, un'implementazione open source del client e del server per il funzionamento con i protocolli SSH 2.0 e SFTP. Questa versione \u00e8 notevole per aver disabilitato di default l'uso delle firme digitali basate su chiavi RSA con hash SHA-1 (&#171;ssh-rsa&#187;).     <\/p>\n<p>La cessazione del supporto per le firme &#171;ssh-rsa&#187; \u00e8 dovuta all'aumento dell'efficacia degli attacchi di collisione con prefisso specifico (il costo per generare una collisione \u00e8 stimato attorno ai 50.000 dollari). Per verificare l'uso di ssh-rsa nei propri sistemi, \u00e8 possibile provare a connettersi tramite ssh con l'opzione &#171;-oHostKeyAlgorithms=-ssh-rsa&#187;. Il supporto per le firme RSA con gli hash SHA-256 e SHA-512 (rsa-sha2-256\/512), supportati da OpenSSH 7.2, rimane invariato.       <\/p>\n<p>Nella maggior parte dei casi, la cessazione del supporto per &#171;ssh-rsa&#187; non richieder\u00e0 azioni manuali da parte degli utenti, poich\u00e9 in OpenSSH precedentemente era abilitata di default l'impostazione UpdateHostKeys, che esegue la transizione automatica dei client verso algoritmi pi\u00f9 sicuri. Per la migrazione viene utilizzata l'estensione del protocollo &#171;hostkeys@openssh.com&#187;, che consente <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-shicago\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2901\">server<\/a> dopo la corretta autenticazione, informare il cliente su tutte le chiavi host disponibili. In caso di connessione a host con versioni molto vecchie di OpenSSH sul lato client, \u00e8 possibile tornare selettivamente a utilizzare le firme \u00abssh-rsa\u00bb aggiungendo in ~\/.ssh\/config:        Host nome_vecchio_host          HostkeyAlgorithms +ssh-rsa  \tPubkeyAcceptedAlgorithms +ssh-rsa            <\/p>\n<p>Nella nuova versione \u00e8 stato anche risolto un problema di sicurezza causato dal fatto che in sshd, a partire dal rilascio di OpenSSH 6.2, l'inizializzazione del gruppo utente non veniva eseguita correttamente durante l'esecuzione di comandi specificati nelle direttive AuthorizedKeysCommand e AuthorizedPrincipalsCommand. Le direttive indicate dovrebbero assicurare l'esecuzione dei comandi con un altro utente, ma in realt\u00e0 ereditavano l'elenco dei gruppi utilizzati durante l'avvio di sshd. Questo comportamento, in presenza di determinate impostazioni di sistema, poteva consentire al processore avviato di ottenere privilegi aggiuntivi nel sistema.                <\/p>\n<p>Nel commento al nuovo rilascio \u00e8 stato anche pubblicato un avviso sull'intenzione di impostare di default l'utilizzo dell'utilit\u00e0 scp per usare SFTP anzich\u00e9 il protocollo obsoleto SCP\/RCP. SFTP utilizza metodi di gestione dei nomi pi\u00f9 prevedibili e non fa uso dell'elaborazione di glob pattern nei nomi dei file tramite shell sul lato dell'altro host, evitando cos\u00ec problemi di sicurezza. In particolare, quando si utilizza SCP e RCP <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"un server\" data-wpil-keyword-link=\"linked\">un server<\/a> prende la decisione su quali file e directory inviare al cliente, mentre il cliente controlla solo la correttezza dei nomi degli oggetti restituiti. Questo, in assenza delle opportune verifiche sul lato client, consente al server di trasmettere altri nomi di file diversi da quelli richiesti. Il protocollo SFTP \u00e8 privo di questi problemi, ma non supporta la rivelazione di percorsi speciali, come \u00ab~\/\u00bb. Per eliminare questa differenza, nella precedente versione di OpenSSH \u00e8 stata proposta una nuova estensione del protocollo SFTP per rivelare i percorsi ~\/ e ~user\/.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55872\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.8, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u0412\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 RSA-\u043a\u043b\u044e\u0447\u0435\u0439 \u0441 \u0445\u044d\u0448\u0435\u043c SHA-1 (&#171;ssh-rsa&#187;). \u041f\u0440\u0435\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 &#171;ssh-rsa&#187; \u043e\u0431\u0443\u0441\u043b\u043e\u0432\u043b\u0435\u043d\u043e \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435\u043c \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u043e\u043d\u043d\u044b\u0445 \u0430\u0442\u0430\u043a \u0441 \u0437\u0430\u0434\u0430\u043d\u043d\u044b\u043c \u043f\u0440\u0435\u0444\u0438\u043a\u0441\u043e\u043c (\u0441\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0434\u0431\u043e\u0440\u0430 \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u0438 \u043e\u0446\u0435\u043d\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u0432 50 \u0442\u044b\u0441\u044f\u0447 \u0434\u043e\u043b\u043b\u0430\u0440\u043e\u0432). \u0414\u043b\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-101430","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=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.8, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u0412\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 RSA-\u043a\u043b\u044e\u0447\u0435\u0439 \u0441 \u0445\u044d\u0448\u0435\u043c SHA-1 (&quot;ssh-rsa&quot;). \u041f\u0440\u0435\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 &quot;ssh-rsa&quot; 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Questo rilascio si distingue per la disabilitazione predefinita dell'uso delle firme digitali basate su chiavi RSA con hash SHA-1 (\"ssh-rsa\"). La cessazione del supporto per le firme \"ssh-rsa\" \u00e8 dovuta a un aumento dell'efficacia degli attacchi di collisione con prefisso definito (il costo per trovare una collisione \u00e8 stimato intorno ai 50.000 dollari). Per","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/reliz-openssh-8-8-s-otklyucheniem-podderzhki-czifrovyh-podpisej-rsa-sha","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\u0420\u0435\u043b\u0438\u0437 OpenSSH 8.8 \u0441 \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 rsa-sha | ProHoster","og:description":"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.8, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u0412\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 RSA-\u043a\u043b\u044e\u0447\u0435\u0439 \u0441 \u0445\u044d\u0448\u0435\u043c SHA-1 (&quot;ssh-rsa&quot;). \u041f\u0440\u0435\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 &quot;ssh-rsa&quot; 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