{"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":"Rilascio di OpenSSH 8.6 con correzione delle vulnerabilit\u00e0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata pubblicata la versione OpenSSH 8.6, un'implementazione open source per client e server che opera con i protocolli SSH 2.0 e SFTP. In questa nuova versione \u00e8 stata corretta una vulnerabilit\u00e0 relativa all'implementazione della direttiva LogVerbose, emersa nel precedente rilascio, che permetteva di aumentare il livello delle informazioni di debug registrate nei log, consentendo anche la filtrazione per modelli, funzioni e file collegati al codice in esecuzione con privilegi ridotti in un ambiente isolato sandbox di sshd.      <\/p>\n<p>Un attaccante che riesce a ottenere il controllo su un processo non privilegiato attraverso una vulnerabilit\u00e0 ancora sconosciuta pu\u00f2 sfruttare il problema correlato a LogVerbose per bypassare l'isolamento della sandbox e attaccare un processo in esecuzione con privilegi elevati. L'uso pratico della vulnerabilit\u00e0 in LogVerbose \u00e8 considerato poco probabile, in quanto la configurazione di default \u00e8 disabilitata e di solito viene utilizzata solo durante il debug. Inoltre, per l'attacco, \u00e8 necessario trovare una nuova vulnerabilit\u00e0 nel processo non privilegiato.    <\/p>\n<p>Modifiche in OpenSSH 8.6 non correlate a vulnerabilit\u00e0:  <\/p>\n<ul>\n<li class=\"l\"> Nella sftp e sftp-server \u00e8 stata implementata una nuova estensione del protocollo &#171;limits@openssh.com&#187;, che consente al client SFTP di ottenere informazioni sulle impostazioni di <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> Nel file sshd_config per sshd \u00e8 stata aggiunta l'impostazione ModuliFile, che consente di specificare il percorso del file 'moduli', contenente i gruppi per DH-GEX.\n<li class=\"l\"> Nel sshd_config per sshd \u00e8 stata aggiunta l'impostazione ModuliFile, che permette di specificare il percorso del file &#171;moduli&#187;, contenente i gruppi per DH-GEX.\n<li class=\"l\"> L'interfaccia per la richiesta della password per GNOME \u00e8 stata suddivisa in due varianti, una per GNOME2 e l'altra per GNOME3 (contrib\/gnome-ssh-askpass3.c). La variante per GNOME3, per migliorare la compatibilit\u00e0 con Wayland, utilizza la chiamata gdk_seat_grab() per gestire il blocco della tastiera e del mouse.\n<li class=\"l\"> \u00c8 stato aggiunto un divieto morbido (soft-disallow) per la chiamata di sistema fstatat64 nel sandbox utilizzato in Linux basato su seccomp-bpf.\n<li class=\"l\"> \u00c8 stata pubblicata la versione OpenSSH 8.6, un'implementazione open source per client e server che opera con i protocolli SSH 2.0 e SFTP. In questa nuova versione \u00e8 stata corretta una vulnerabilit\u00e0 relativa all'implementazione della direttiva LogVerbose, emersa nel precedente rilascio, che permetteva di aumentare il livello delle informazioni di debug registrate nei log, consentendo anche la filtrazione per modelli, funzioni e file collegati al codice in esecuzione con    <\/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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