{"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\/ro\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Release OpenSSH 8.6 cu corectarea vulnerabilit\u0103\u021bii.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A fost publicat\u0103 versiunea OpenSSH 8.6, o implementare open-source a clientului \u0219i serverului pentru protocolul SSH 2.0 \u0219i SFTP. Noua versiune ajut\u0103 la remedierea unei vulnerabilit\u0103\u021bi \u00een implementarea directivei LogVerbose, ap\u0103rut\u0103 \u00een edi\u021bia precedent\u0103, care permite cre\u0219terea nivelului de informa\u021bii de debug \u00eenregistrate \u00een log, inclusiv posibilitatea de a filtra dup\u0103 modele, func\u021bii \u0219i fi\u0219iere legate de codul care ruleaz\u0103 cu privilegii reduse \u00een procesul sshd, izolat \u00eentr-un mediu sandbox.      <\/p>\n<p>Un atacator care reu\u0219e\u0219te s\u0103 ob\u021bin\u0103 control asupra unui proces neprivilegiat printr-o vulnerabilitate necunoscut\u0103 p\u00e2n\u0103 acum poate folosi problema asociat\u0103 cu LogVerbose pentru a ocoli izolarea sandbox \u0219i a lansa un atac asupra procesului care ruleaz\u0103 cu privilegii ridicate. Exploatarea vulnerabilit\u0103\u021bii din LogVerbose este considerat\u0103 pu\u021bin probabil\u0103 \u00een practic\u0103, deoarece setarea LogVerbose este dezactivat\u0103 implicit \u0219i este utilizat\u0103 de obicei doar \u00een timpul depan\u0103rii. De asemenea, pentru atac este necesar s\u0103 se g\u0103seasc\u0103 o nou\u0103 vulnerabilitate \u00een procesul neprivilegiat.    <\/p>\n<p>Modific\u0103rile din OpenSSH 8.6 care nu sunt legate de vulnerabilitate:  <\/p>\n<ul>\n<li class=\"l\"> \u00cen sftp \u0219i sftp-server a fost implementat o nou\u0103 extensie a protocolului &#171;limits@openssh.com&#187;, care permite clientului SFTP s\u0103 ob\u021bin\u0103 informa\u021bii despre istoric. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/ro\/server\/dts-dronten\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">server<\/a> limite, inclusiv limitele pentru dimensiunea maxim\u0103 a pachetelor \u0219i opera\u021biunile de scriere \u0219i citire. \u00cen sftp, noua extensie este utilizat\u0103 pentru a alege dimensiunea optim\u0103 a blocurilor \u00een timpul transmiterii de date.\n<li class=\"l\"> \u00cen sshd_config pentru sshd a fost ad\u0103ugat\u0103 setarea ModuliFile, care permite specificarea c\u0103ii c\u0103tre fi\u0219ierul &#171;moduli&#187;, care con\u021bine grupuri pentru DH-GEX.\n<li class=\"l\"> \u00cen testele unitare a fost ad\u0103ugat\u0103 variabila de mediu TEST_SSH_ELAPSED_TIMES pentru a activa afi\u0219area timpului trecut de la \u00eenceputul fiec\u0103rui test.\n<li class=\"l\"> Interfa\u021ba pentru solicitarea parolei pentru GNOME a fost \u00eemp\u0103r\u021bit\u0103 \u00een dou\u0103 op\u021biuni, una pentru GNOME2 \u0219i cealalt\u0103 pentru GNOME3 (contrib\/gnome-ssk-askpass3.c). Op\u021biunea pentru GNOME3, pentru a \u00eembun\u0103t\u0103\u021bi compatibilitatea cu Wayland, folose\u0219te apelul gdk_seat_grab() pentru gestionarea capturii tastaturii \u0219i mouse-ului.\n<li class=\"l\"> \u00cen sandboxul utilizat \u00een Linux, bazat pe seccomp-bpf, a fost ad\u0103ugat o interdic\u021bie moale (soft-disallow) pentru apelul sistemului fstatat64.    <\/ul>\n<p>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54986\">opennet.ro<\/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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