{"id":170353,"date":"2026-05-04T12:24:42","date_gmt":"2026-05-04T10:24:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej"},"modified":"2026-05-04T12:24:42","modified_gmt":"2026-05-04T10:24:42","slug":"vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","title":{"rendered":"Udgivelse af Dropbear SSH 2026.90 med afb\u00f8jning af s\u00e5rbarheder","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Udgivelsen af projektet Dropbear 2026.90, der udvikler SSH-serveren og klienten, har f\u00e5et udbredelse i tr\u00e5dl\u00f8se routere og kompakte distributioner som OpenWrt. Dropbear adskiller sig ved lavt hukommelsesforbrug, muligheden for at deaktivere overfl\u00f8dig funktionalitet under opbygningen og underst\u00f8ttelse af at samle klient- og serverkode i en enkelt eksekverbar fil, ligesom busybox. Ved statisk binding med uClibc fylder den eksekverbare fil kun 110kB. Dropbear underst\u00f8tter X11-omdirigering, er kompatibel med OpenSSH-n\u00f8glefilen (~\/.ssh\/authorized_keys) og kan skabe multi-forbindelser med tunneling gennem en transit-host. Projektkoden er skrevet i C og distribueres under en licens t\u00e6t p\u00e5 MIT.      <\/p>\n<p>I den nye version er flere sikkerhedsproblemer blevet rettet:  <\/p>\n<ul>\n<li class=\"l\"> Ufuldst\u00e6ndig afhj\u00e6lpning af scp-s\u00e5rbarheden (CVE-2019-6111), der tillader overskrivning af andre filer ved tilslutning til en ondsindet <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/da\/server\/dts-shicago\/\" title=\"server\" data-wpil-keyword-link=\"linked\">server<\/a>. N\u00e5r scp <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/da\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\">server<\/a> Tager beslutning om, hvilke filer og mapper der skal sendes til klienten, mens klienten blot kontrollerer korrektheden af de returnerede objekt navne. Klient-side tjekket forhindrer at g\u00e5 uden for den nuv\u00e6rende mappe (&#171;..&#187;), men i tilf\u00e6lde af rekursiv kopiering (-r) tages der ikke h\u00f8jde for overf\u00f8rsel af mapper med navne, der adskiller sig fra de oprindeligt anmodede. Problemet er l\u00f8st ved at forbyde brugen af optionen &#171;-r&#187; med en allerede eksisterende m\u00e5lmapppe.\n<li class=\"l\"> S\u00e5rbarhed (CVE-2026-35385) i scp-v\u00e6rkt\u00f8jet, hvorved flags for setuid\/setgid ikke blev renset efter at en fil med root-rettigheder blev uploadet med optionen &#171;-O&#187; og uden optionen &#171;-p&#187;.\n<li class=\"l\"> Mulighed for at omg\u00e5 udf\u00f8relsen af kommandoen &#171;forced_command&#187; i konfigurationen af authorized_keys, n\u00e5r en autentificeret bruger tilslutter sig ved hj\u00e6lp af optionen &#171;-t&#187; (login med password og offentlig n\u00f8gle).\n<li class=\"l\"> Denial of service ved at oprette en speciel fil med navnet authorized_keys af en lokal bruger, der blokerer l\u00e6seoperationer.\n<li class=\"l\"> L\u00e6se data fra et omr\u00e5de uden for bufferen ved oprettelse af omdirigeringsh\u00e5ndterere for klient- og serveranmodninger, hvilket kan f\u00f8re til lukning af vilk\u00e5rlige filbeskrivelser.    <\/ul>\n<p>Ikke-sikkerhedsrelaterede \u00e6ndringer:  <\/p>\n<ul>\n<li class=\"l\"> I ssh er der tilf\u00f8jet optionen &#171;-R&#187; til at videref\u00f8re unix-sockets gennem SSH-tunnelen.\n<li class=\"l\"> I ssd er der tilf\u00f8jet optionen &#171;-M&#187; til at begr\u00e6nse den maksimale varighed af en session.\n<li class=\"l\"> I &#171;authorized_keys&#187; er der tilf\u00f8jet optionen &#171;permitlisten&#187; for at begr\u00e6nse de tilladte porte.\n<li class=\"l\"> Underst\u00f8ttelse af RSA-n\u00f8gler, der blev oprettet i dropbearkey 0.32 eller tidligere versioner af dette v\u00e6rkt\u00f8j, er blevet stoppet, da disse er udsat for angreb via sidekanaler, der vurderer forskellen i behandlingstiden for data, der er blevet cachet og ikke cachet.\n<li class=\"l\"> For at blokere for brute-force angreb p\u00e5 \u00e5bne n\u00f8gler er antallet af foresp\u00f8rgsler til \u00e5bne n\u00f8gler begr\u00e6nset til 15 fors\u00f8g pr. session.        <\/ul>\n<p>Kilde: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65356\">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 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Dropbear 2026.90, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440 \u0438 \u043a\u043b\u0438\u0435\u043d\u0442 SSH, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0439 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430\u0445 \u0438 \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u044b\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445, \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 OpenWrt. Dropbear \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u043d\u0438\u0437\u043a\u0438\u043c \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435\u043c \u043f\u0430\u043c\u044f\u0442\u0438, \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c\u044e \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u043b\u0438\u0448\u043d\u0435\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043d\u0430 \u044d\u0442\u0430\u043f\u0435 \u0441\u0431\u043e\u0440\u043a\u0438 \u0438 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u043e\u0439 \u0441\u0431\u043e\u0440\u043a\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0432 \u043e\u0434\u043d\u043e\u043c \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u043c \u0444\u0430\u0439\u043b\u0435 \u043f\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0438 \u0441 busybox. \u041f\u0440\u0438 \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u043c \u0441\u0432\u044f\u0437\u044b\u0432\u0430\u043d\u0438\u0438 \u0441 uClibc \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0439 \u0444\u0430\u0439\u043b Dropbear \u0437\u0430\u043d\u0438\u043c\u0430\u0435\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-170353","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Dropbear 2026.90, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440 \u0438 \u043a\u043b\u0438\u0435\u043d\u0442 SSH, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0439 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430\u0445 \u0438 \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u044b\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445, \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 OpenWrt.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Erik Peterson\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/da\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"da_DK\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u0412\u044b\u043f\u0443\u0441\u043a Dropbear SSH 2026.90 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Dropbear 2026.90, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440 \u0438 \u043a\u043b\u0438\u0435\u043d\u0442 SSH, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0439 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430\u0445 \u0438 \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u044b\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445, \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 OpenWrt.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/da\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-05-04T10:24:42+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-05-04T10:24:42+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Udgivelse af Dropbear SSH 2026.90 med reparation af s\u00e5rbarheder | ProHoster","description":"Udgivelsen af Dropbear projekt 2026.90 er offentliggjort, som udvikler SSH-server og -klient, der er blevet udbredt i tr\u00e5dl\u00f8se routere og kompakte distributioner som OpenWrt.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412\u044b\u043f\u0443\u0441\u043a Dropbear SSH 2026.90 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 | ProHoster","og:description":"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Dropbear 2026.90, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440 \u0438 \u043a\u043b\u0438\u0435\u043d\u0442 SSH, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0439 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430\u0445 \u0438 \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u044b\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445, \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 OpenWrt.","og:url":"https:\/\/prohoster.info\/da\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-05-04T10:24:42+00:00","article:modified_time":"2026-05-04T10:24:42+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/170353","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/comments?post=170353"}],"version-history":[{"count":2,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/170353\/revisions"}],"predecessor-version":[{"id":173160,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/170353\/revisions\/173160"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media?parent=170353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/categories?post=170353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/tags?post=170353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}