Dopo sei mesi di sviluppo, \u00e8 stato presentato il rilascio di OpenSSH 8.9, un'implementazione open source di client e server per il protocollo SSH 2.0 e SFTP. Nella nuova versione \u00e8 stata corretta una vulnerabilit\u00e0 in sshd che potenzialmente permetteva l'accesso senza autenticazione. Il problema \u00e8 causato da un overflow intero nel codice di autenticazione, ma l'esploitazione \u00e8 possibile solo in combinazione con altri errori logici nel codice. <\/p>\n
Nella sua forma attuale, la vulnerabilit\u00e0 non \u00e8 sfruttabile con l'attivazione della modalit\u00e0 di separazione dei privilegi, poich\u00e9 la sua manifestazione \u00e8 bloccata da controlli specifici eseguiti nel codice di monitoraggio della separazione dei privilegi. La modalit\u00e0 di separazione dei privilegi \u00e8 attivata di default dal 2002, a partire da OpenSSH 3.2.2, ed \u00e8 obbligatoria a partire dal rilascio di OpenSSH 7.5, pubblicato 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 interi. <\/p>\n
Altre modifiche: <\/p>\n
In uno dei prossimi rilasci, si prevede di passare per impostazione predefinita l'utilit\u00e0 scp all'uso di SFTP invece del protocollo obsoleto SCP\/RCP. In SFTP vengono utilizzati metodi di gestione dei nomi pi\u00f9 prevedibili e non viene effettuata la gestione dei modelli glob nei nomi dei file tramite shell sul lato di un altro host, che crea problemi di sicurezza. In particolare, quando si utilizza SCP e RCP, il server decide quali file e cartelle inviare al client, mentre il client controlla solo la correttezza dei nomi degli oggetti restituiti, il che, in assenza di controlli adeguati da parte del client, consente server<\/a> to pass other file names that differ from the requested ones. The SFTP protocol lacks the mentioned issues, but does not support revealing special paths such as '~\/'. To address this difference, in the previous release of OpenSSH, a new extension to the SFTP protocol was proposed to reveal the 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\udd47 Rilascio di OpenSSH 8.9 con la correzione di una vulnerabilit\u00e0 in sshd | ProHoster","description":"Dopo sei mesi di sviluppo, \u00e8 stato presentato il rilascio di OpenSSH 8.9, un'implementazione open-source del client e 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"