{"id":99965,"date":"2021-04-19T10:22:35","date_gmt":"2021-04-19T08:22:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti"},"modified":"2021-04-19T10:22:35","modified_gmt":"2021-04-19T08:22:35","slug":"reliz-openssh-8-6-s-ustraneniem-uyazvimosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Release di OpenSSH 8.6 con la correzione di una vulnerabilit\u00e0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stato pubblicato il rilascio di OpenSSH 8.6, un'implementazione open source di client e server per lavorare con i protocolli SSH 2.0 e SFTP. Nella nuova versione \u00e8 stata risolta una vulnerabilit\u00e0 nell'implementazione della direttiva LogVerbose, emersa nel rilascio precedente e che consentiva di aumentare il livello delle informazioni di debug registrate nel log, inclusa la possibilit\u00e0 di filtrare per modelli, funzioni e file correlati al codice eseguito con privilegi ridotti nel processo sshd, isolato in un ambiente sandbox.      <\/p>\n<p>Un attaccante che riesce a controllare un processo non privilegiato tramite un'altra vulnerabilit\u00e0 sconosciuta pu\u00f2 utilizzare il problema associato a LogVerbose per bypassare l'isolamento sandbox e attaccare il processo eseguito con privilegi elevati. L'uso pratico della vulnerabilit\u00e0 in LogVerbose \u00e8 considerato improbabile, poich\u00e9 la configurazione di LogVerbose \u00e8 disabilitata per default e di solito \u00e8 utilizzata solo durante il debug. Inoltre, per l'attacco \u00e8 necessario scoprire una nuova vulnerabilit\u00e0 nel processo non privilegiato.    <\/p>\n<p>Modifiche in OpenSSH 8.6 non correlate alla vulnerabilit\u00e0:  <\/p>\n<ul>\n<li class=\"l\"> \u0412 sftp \u0438 sftp-server \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043e \u043d\u043e\u0432\u043e\u0435 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 &#171;limits@openssh.com&#187;, \u0434\u0430\u044e\u0449\u0435\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c SFTP-\u043a\u043b\u0438\u0435\u043d\u0442\u0443 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043d\u0430 <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-dronten\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">server<\/a> limiti, inclusi i limiti sulla dimensione massima dei pacchetti e sulle operazioni di scrittura e lettura. In sftp, la nuova estensione \u00e8 utilizzata per selezionare la dimensione ottimale dei blocchi durante il trasferimento dei dati.\n<li class=\"l\"> \u0412 sshd_config \u0434\u043b\u044f sshd \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 ModuliFile, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u043f\u0443\u0442\u044c \u043a \u0444\u0430\u0439\u043b\u0443 &#171;moduli&#187;, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0435\u043c\u0443 \u0433\u0440\u0443\u043f\u043f\u044b \u0434\u043b\u044f DH-GEX.\n<li class=\"l\"> Nei test unitari \u00e8 stata aggiunta la variabile d'ambiente TEST_SSH_ELAPSED_TIMES per abilitare l'output dei tempi trascorsi dall'avvio di ogni test.\n<li class=\"l\"> L'interfaccia per richiedere una password per GNOME \u00e8 stata suddivisa in due varianti, una per GNOME2 e l'altra per GNOME3 (contrib\/gnome-ssk-askpass3.c). La variante per GNOME3, per migliorare la compatibilit\u00e0 con Wayland, utilizza la chiamata gdk_seat_grab() per gestire il controllo della tastiera e del mouse.\n<li class=\"l\"> Nel sandbox utilizzato in Linux basato su seccomp-bpf \u00e8 stato aggiunto un divieto morbido (soft-disallow) per la chiamata di sistema fstatat64.    <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54986\">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 8.6, \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 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432\u044b LogVerbose, \u043f\u043e\u044f\u0432\u0438\u0432\u0448\u0435\u0439\u0441\u044f \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u0441\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0435\u043c\u043e\u0439 \u0432 \u043b\u043e\u0433 \u043e\u0442\u043b\u0430\u0434\u043e\u0447\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0448\u0430\u0431\u043b\u043e\u043d\u0430\u043c, \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c \u0438 \u0444\u0430\u0439\u043b\u0430\u043c, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u043c \u0441 \u043a\u043e\u0434\u043e\u043c, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u043c \u0441\u043e [&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-99965","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 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