Dopo sei mesi di sviluppo, \u00e8 stato rilasciato OpenSSH 8.9, un'implementazione open source del client e del server per il protocollo SSH 2.0 e SFTP. Nella nuova versione, \u00e8 stata corretta una vulnerabilit\u00e0 in sshd che poteva consentire accessi non autorizzati. Questo problema era causato da un'overflow di interi nel codice di autenticazione, ma la sua sfruttabilit\u00e0 era possibile solo in combinazione con altri errori logici nel codice. <\/p>\n
Nella situazione attuale, la vulnerabilit\u00e0 non \u00e8 sfruttabile se viene attivata la modalit\u00e0 di separazione dei privilegi, poich\u00e9 la sua manifestazione viene bloccata da controlli specifici eseguiti nel codice di tracciamento della separazione dei privilegi. La modalit\u00e0 di separazione dei privilegi \u00e8 stata attivata per impostazione predefinita nel 2002, a partire da OpenSSH 3.2.2, ed \u00e8 diventata obbligatoria a partire dalla versione OpenSSH 7.5, pubblicata nel 2017. Inoltre, nelle versioni portabili di OpenSSH a partire dalla versione 6.5 (2014), la vulnerabilit\u00e0 \u00e8 bloccata dalla compilazione con l'attivazione dei flag di protezione contro gli overflow di interi. <\/p>\n
Altre modifiche: <\/p>\n
In una delle prossime versioni, si prevede di impostare di default l'utilizzo dell'utilit\u00e0 scp per impiegare SFTP invece del protocollo obsoleto SCP\/RCP. In SFTP vengono utilizzati metodi di gestione dei nomi pi\u00f9 prevedibili e non si impiega la gestione dei glob nelle denominazioni dei file attraverso il shell sul lato dell'altro host, che crea problemi di sicurezza. In particolare, quando si utilizza SCP e RCP, il server decide quali file e directory inviare al client, mentre il client verifica solo la correttezza dei nomi degli oggetti restituiti, il che, in assenza di adeguati controlli sul lato del client, consente di trasferire nomi di file diversi da quelli richiesti. server<\/a> to pass different file names from those requested. The SFTP protocol is free from these issues but does not support revealing special paths like \u00ab~\/.\u00bb. To address this difference, a new SFTP protocol extension was proposed in the previous OpenSSH release for revealing paths ~ and ~user\/. \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 8.9, \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 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0432 sshd \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u0431\u0435\u0437 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u044b\u043c \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435\u043c \u0432 \u043a\u043e\u0434\u0435 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0441\u043e\u0447\u0435\u0442\u0430\u043d\u0438\u0438 \u0441 \u0434\u0440\u0443\u0433\u0438\u043c\u0438 \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u043c\u0438 \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043a\u043e\u0434\u0435. \u0412 \u0442\u0435\u043a\u0443\u0449\u0435\u043c […]<\/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-103424","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Rilascio di OpenSSH 8.9 con risoluzione della vulnerabilit\u00e0 in sshd | ProHoster","description":"Dopo sei mesi di sviluppo, \u00e8 stato rilasciato OpenSSH 8.9, un'implementazione open source di client e server per il 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"