{"id":38754,"date":"2019-10-31T22:25:45","date_gmt":"2019-10-31T19:25:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-openssh-8-1\/"},"modified":"2019-10-31T22:25:45","modified_gmt":"2019-10-31T19:25:45","slug":"reliz-openssh-8-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/reliz-openssh-8-1","title":{"rendered":"Rilascio di OpenSSH 8.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dopo sei mesi di sviluppo <noindex><a rel=\"nofollow\" href=\"http:\/\/lists.mindrot.org\/pipermail\/openssh-unix-dev\/2019-October\/037966.html\">presentato<\/a><\/noindex> rilascio <noindex><a rel=\"nofollow\" href=\"http:\/\/www.openssh.com\/\">OpenSSH 8.1<\/a><\/noindex>, implementazione open source di client e server per il funzionamento sui protocolli SSH 2.0 e SFTP. <\/p>\n<p>Un'attenzione particolare merita la correzione di una vulnerabilit\u00e0 che colpisce ssh, sshd, ssh-add e ssh-keygen. Il problema \u00e8 presente nel codice di analisi delle chiavi private di tipo XMSS e consente a un attaccante di innescare un overflow intero. La vulnerabilit\u00e0 \u00e8 stata segnalata come attivamente sfruttabile, ma con una bassa applicabilit\u00e0, poich\u00e9 il supporto per le chiavi XMSS \u00e8 considerato una funzionalit\u00e0 sperimentale disattivata di default (nella versione portabile in autoconf non \u00e8 nemmeno prevista un'opzione di build per abilitare XMSS).<\/p>\n<p>Principali modifiche: <\/p>\n<ul>\n<li class=\"l\"> In ssh, sshd e ssh-agent <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50929\">\u00e8 stato aggiunto<\/a><\/noindex> il codice che impedisce il recupero della chiave privata presente nella memoria volatile a causa di attacchi tramite canali laterali, come <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47856\">Spectre, Meltdown<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=41340\">RowHammer<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/rambleed.com\/\">RAMBleed<\/a><\/noindex>. Le chiavi private sono ora criptate al momento del caricamento in memoria e decrittografate solo durante l'uso, rimanendo criptate nel frattempo. Con questo approccio, per recuperare con successo la chiave privata, un attaccante deve prima recuperare una chiave intermedia casualmente generata di 16 KB, utilizzata per crittografare la chiave principale, cosa che \u00e8 improbabile data l'attuale frequenza degli errori di recupero nei modelli di attacco moderni;\n<li class=\"l\"> In  <noindex><a rel=\"nofollow\" href=\"https:\/\/man.openbsd.org\/ssh-keygen.1\">ssh-keygen<\/a><\/noindex>  \u00e8 stata aggiunta la supporto sperimentale per uno schema semplificato di creazione e verifica delle firme digitali. Le firme digitali possono essere create utilizzando normali chiavi SSH, memorizzate su disco o in ssh-agent, e verificate usando qualcosa di simile a authorized_keys <noindex><a rel=\"nofollow\" href=\"https:\/\/man.openbsd.org\/ssh-keygen.1#ALLOWED_SIGNERS\">lista di chiavi autorizzate<\/a><\/noindex>. Nella firma digitale viene incorporata l'informazione sullo spazio dei nomi per evitare confusioni durante l'uso in diversi ambiti (ad esempio, per email e file);\n<li class=\"l\"> ssh-keygen \u00e8 ora impostato di default per utilizzare l'algoritmo rsa-sha2-512 per la firma dei certificati digitali basati su chiavi RSA (quando operante in modalit\u00e0 CA). Tali certificati non sono compatibili con le versioni precedenti a OpenSSH 7.2 (per garantire la compatibilit\u00e0, \u00e8 necessario sovrascrivere il tipo di algoritmo, ad esempio tramite la chiamata \u00abssh-keygen -t ssh-rsa -s ...\u00bb);\n<li class=\"l\"> In ssh, l'espressione ProxyCommand supporta ora l'espansione del wildcard \u00ab%n\u00bb (il nome host specificato nella stringa di indirizzo);\n<li class=\"l\"> Nelle liste degli algoritmi di crittografia per ssh e sshd, per l'inserimento degli algoritmi proposti di default \u00e8 ora possibile utilizzare il carattere \u00ab^\u00bb. Ad esempio, per aggiungere ssh-ed25519 alla lista di default, si pu\u00f2 specificare \u00abHostKeyAlgorithms ^ssh-ed25519\u00bb;\n<li class=\"l\"> In ssh-keygen \u00e8 stato garantito l'output del commento allegato alla chiave all'estrazione della chiave pubblica dalla chiave privata;\n<li class=\"l\"> In ssh-keygen \u00e8 stata aggiunta la possibilit\u00e0 di utilizzare il flag \u00ab-v\u00bb durante le operazioni di ricerca delle chiavi (ad esempio, \u00abssh-keygen -vF host\u00bb), l'indicazione del quale porta all'output di una firma host visiva;\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di utilizzare <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/PKCS_8\">PKCS8<\/a><\/noindex> come formato alternativo per la memorizzazione delle chiavi private su disco. Per impostazione predefinita, continua ad essere utilizzato il formato PEM, mentre PKCS8 pu\u00f2 rivelarsi utile per garantire la compatibilit\u00e0 con applicazioni di terze parti.\n<\/ul>\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=51640\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0448\u0435\u0441\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 8.1, \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. \u041e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u044f \u0432 \u043d\u043e\u0432\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u0437\u0430\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u0435\u0442 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0435\u0439 ssh, sshd, ssh-add \u0438 ssh-keygen. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043a\u043e\u0434\u0435 \u043f\u0430\u0440\u0441\u0438\u043d\u0433\u0430 \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0445 \u043a\u043b\u044e\u0447\u0435\u0439 \u0441 \u0442\u0438\u043f\u043e\u043c XMSS \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u0435 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043e\u0442\u043c\u0435\u0447\u0435\u043d\u0430 \u043a\u0430\u043a \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u0430\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-38754","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- 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Particolare attenzione nel nuovo rilascio \u00e8 riservata alla risoluzione di una vulnerabilit\u00e0 che coinvolge ssh, sshd, ssh-add e ssh-keygen. Il problema \u00e8 presente nel codice di parsing delle chiavi private di tipo XMSS e consente a un attaccante di iniziare un overflow intero. La vulnerabilit\u00e0 \u00e8 stata segnalata come exploitabile.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/reliz-openssh-8-1","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 8.1 | ProHoster","og:description":"\u041f\u043e\u0441\u043b\u0435 \u0448\u0435\u0441\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 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