{"id":99317,"date":"2021-03-03T10:22:34","date_gmt":"2021-03-03T08:22:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-5"},"modified":"2021-03-03T10:22:34","modified_gmt":"2021-03-03T08:22:34","slug":"reliz-openssh-8-5","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/reliz-openssh-8-5","title":{"rendered":"Rilascio di OpenSSH 8.5","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dopo cinque mesi di sviluppo, \u00e8 stato rilasciato OpenSSH 8.5, un'implementazione open source del client e del server per lavorare con i protocolli SSH 2.0 e SFTP.    <\/p>\n<p>Gli sviluppatori di OpenSSH hanno avvertito riguardo al prossimo passaggio degli algoritmi basati su hash SHA-1 nella categoria degli algoritmi obsoleti, a causa dell'aumento dell'efficacia degli attacchi di collisione con prefisso specificato (il costo per generare una collisione \u00e8 stimato intorno ai 50.000 dollari). In una delle prossime versioni, si prevede di disabilitare per impostazione predefinita l'uso dell'algoritmo di firma digitale a chiave pubblica &#171;ssh-rsa&#187;, che \u00e8 menzionato nell'RFC originale per il protocollo SSH e rimane ampiamente diffuso nella pratica.    <\/p>\n<p>Per verificare l'uso di ssh-rsa nei propri sistemi, \u00e8 possibile provare a connettersi via ssh con l'opzione &#171;-oHostKeyAlgorithms=-ssh-rsa&#187;. Tuttavia, la disabilitazione delle firme digitali &#171;ssh-rsa&#187; per impostazione predefinita non implica un completo abbandono dell'uso delle chiavi RSA, poich\u00e9 oltre a SHA-1 il protocollo SSH consente l'uso di altri algoritmi di hashing. In particolare, oltre a &#171;ssh-rsa&#187;, sar\u00e0 possibile continuare a utilizzare le combinazioni &#171;rsa-sha2-256&#187; (RSA\/SHA256) e &#171;rsa-sha2-512&#187; (RSA\/SHA512).    <\/p>\n<p>Per facilitare la transizione verso i nuovi algoritmi in OpenSSH 8.5, l'impostazione UpdateHostKeys \u00e8 abilitata per impostazione predefinita, consentendo di tradurre automaticamente i client verso algoritmi pi\u00f9 sicuri. Con questa impostazione viene attivata un'estensione speciale del protocollo &#171;hostkeys@openssh.com&#187;, che consente al server di informare il client su tutte le chiavi host disponibili dopo che l'autenticazione \u00e8 avvenuta. Il client pu\u00f2 riflettere queste chiavi nel proprio file ~\/.ssh\/known_hosts, rendendo possibile l'aggiornamento delle chiavi host e semplificando la gestione delle chiavi. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-dronten\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2618\">server<\/a>.     <\/p>\n<p>L'uso di UpdateHostKeys \u00e8 soggetto a alcune condizioni che potrebbero essere revocate in futuro: la chiave deve essere presente in UserKnownHostsFile e non deve essere utilizzata in GlobalKnownHostsFile; la chiave deve avere un solo nome; non deve essere utilizzato un certificato della chiave host; non devono essere usate maschere per il nome host in known_hosts; la configurazione VerifyHostKeyDNS deve essere disabilitata; il parametro UserKnownHostsFile deve essere abilitato.     <\/p>\n<p>Tra gli algoritmi raccomandati per la migrazione sono menzionati rsa-sha2-256\/512 basati su RFC8332 RSA SHA-2 (supportato da OpenSSH 7.2 e utilizzato per impostazione predefinita), ssh-ed25519 (supportato da OpenSSH 6.5) ed ecdsa-sha2-nistp256\/384\/521 basati su RFC5656 ECDSA (supportato da OpenSSH 5.7).           <\/p>\n<p>Altre modifiche:  <\/p>\n<ul>\n<li class=\"l\"> Modifiche relative alla sicurezza:\n<ul>\n<li class=\"l\"> Nel ssh-agent \u00e8 stata risolta una vulnerabilit\u00e0 causata dal doppio rilascio di memoria gi\u00e0 liberata (double-free). Il problema si presenta con il rilascio di OpenSSH 8.2 e pu\u00f2 essere potenzialmente sfruttato se l'attaccante ha accesso al socket ssh-agent sulla sistema locale. L'esploit\u00e0zione \u00e8 complicata dal fatto che l'accesso al socket \u00e8 riservato solo a root e all'utente originale. Lo scenario di attacco pi\u00f9 probabile prevede un reindirizzamento dell'agente a un account sotto il controllo dell'attaccante o a un host sul quale l'attaccante ha accesso root.\n<li class=\"l\"> In sshd \u00e8 stata aggiunta una protezione contro la trasmissione di parametri molto grandi con il nome utente nel sottosistema PAM, che consente di bloccare vulnerabilit\u00e0 nei moduli PAM (Pluggable Authentication Module). Ad esempio, questa modifica aiuta a prevenire l'uso di sshd come vettore per sfruttare la vulnerabilit\u00e0 root recentemente scoperta in Solaris (CVE-2020-14871).      <\/ul>\n<li class=\"l\"> Modifiche che potrebbero compromettere la compatibilit\u00e0:\n<ul>\n<li class=\"l\"> In ssh e sshd \u00e8 stato riprogettato un metodo sperimentale di scambio di chiavi resistente agli attacchi da parte di computer quantistici. I computer quantistici risolvono drasticamente pi\u00f9 rapidamente il problema della scomposizione dei numeri naturali in fattori primi, fondamentale per gli attuali algoritmi di crittografia asimmetrica, che non possono essere risolti in modo efficiente su processori classici. Il metodo utilizzato si basa sull'algoritmo NTRU Prime, sviluppato per i sistemi crittografici post-quantum, e su un metodo di scambio di chiavi basato su curve ellittiche X25519. Invece di sntrup4591761x25519-sha512@tinyssh.org, il metodo \u00e8 ora identificato come sntrup761x25519-sha512@openssh.com (l'algoritmo sntrup4591761 \u00e8 stato sostituito con sntrup761).\n<li class=\"l\"> In ssh and sshd, the order of announcement for supported digital signature algorithms has changed. ED25519 is now prioritized over ECDSA.\n<li class=\"l\"> In ssh and sshd, the setting of TOS\/DSCP quality parameters for interactive sessions is now done before establishing the TCP connection.\n<li class=\"l\"> In ssh and sshd, support for the rijndael-cbc@lysator.liu.se cipher has been removed, which is identical to aes256-cbc and was used before RFC-4253 was adopted.\n<li class=\"l\"> By default, the CheckHostIP option is disabled, which offers minimal benefits but significantly complicates key rotation for hosts behind load balancers.      <\/ul>\n<li class=\"l\"> In sshd, new settings PerSourceMaxStartups and PerSourceNetBlockSize have been added to limit the intensity of handler startups based on the client's address. These parameters allow more precise control over process startup limits compared to the general MaxStartups setting.\n<li class=\"l\">  In ssh and sshd, a new LogVerbose setting has been introduced, enabling forced increases in the level of debug information logged, with filtering options available by patterns, functions, and files.\n<li class=\"l\"> In ssh, when accepting a new host key, all host names and <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/lir\/ipv4\/\"   title=\"IP addresses\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"830\">IP addresses<\/a>, associati alla chiave.\n<li class=\"l\"> In ssh \u00e8 possibile specificare l'opzione UserKnownHostsFile=none per disabilitare l'uso del file known_hosts durante l'identificazione delle chiavi host.\n<li class=\"l\"> Nel ssh_config per ssh \u00e8 stata aggiunta l'impostazione KnownHostsCommand, che consente di ottenere i dati di known_hosts dall'output di un comando specificato.\n<li class=\"l\"> Nel ssh_config per ssh \u00e8 stata aggiunta l'opzione PermitRemoteOpen, che limita il punto di destinazione quando si utilizza l'opzione RemoteForward con SOCKS.\n<li class=\"l\"> In ssh, per le chiavi FIDO \u00e8 garantita una nuova richiesta di PIN in caso di errore nell'operazione di firma digitale a causa di un PIN errato, senza che l'utente possa richiederne uno (ad esempio, quando non sono stati acquisiti dati biometrici corretti e il dispositivo \u00e8 tornato all'immissione manuale del PIN).\n<li class=\"l\"> Nell'sshd, al meccanismo di isolamento del processo basato su seccomp-bpf sulla piattaforma Linux \u00e8 stata aggiunta la supporto per ulteriori chiamate di sistema.\n<li class=\"l\"> Aggiornato lo strumento contrib\/ssh-copy-id.          <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54690\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u043f\u044f\u0442\u0438 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.5, \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. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 OpenSSH \u043d\u0430\u043f\u043e\u043c\u043d\u0438\u043b\u0438 \u043e \u0433\u0440\u044f\u0434\u0443\u0449\u0435\u043c \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0435 \u0432 \u0440\u0430\u0437\u0440\u044f\u0434 \u0443\u0441\u0442\u0430\u0440\u0435\u0432\u0448\u0438\u0445 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u0445\u0435\u0448\u0438 SHA-1, \u0432 \u0441\u0432\u044f\u0437\u0438 \u0441 \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). \u0412 \u043e\u0434\u043d\u043e\u043c [&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-99317","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=\"\u041f\u043e\u0441\u043b\u0435 \u043f\u044f\u0442\u0438 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.5, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 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Gli sviluppatori di OpenSSH hanno ricordato che gli algoritmi che utilizzano hash SHA-1 passeranno a essere considerati obsoleti, a causa dell'aumento dell'efficacia degli attacchi di collisione con prefisso specificato (il costo per generare una collisione \u00e8 stimato attorno ai 50.000 dollari). 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