{"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\/sv\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","title":{"rendered":"Utgivning av Dropbear SSH 2026.90 med s\u00e4kerhets\u00e5tg\u00e4rder","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Utg\u00e5van av projektet Dropbear 2026.90 har publicerats, som utvecklar b\u00e5de server och klient f\u00f6r SSH, spridd i tr\u00e5dl\u00f6sa routrar och kompakta distributioner som OpenWrt. Dropbear utm\u00e4rker sig med l\u00e5g minnesanv\u00e4ndning, m\u00f6jlighet att st\u00e4nga av \u00f6verfl\u00f6dig funktionalitet under byggnadsfasen, samt st\u00f6d f\u00f6r att bygga klient och server i en enda k\u00f6rbar fil likt busybox. Vid statisk l\u00e4nkning med uClibc tar den k\u00f6rbara filen Dropbear endast 110 kB. Dropbear st\u00f6der X11-omdirigering, \u00e4r kompatibel med OpenSSH:s nyckelfil (~\/.ssh\/authorized_keys) och kan skapa multipla anslutningar med vidarekoppling genom en transitv\u00e4rd. Projektets kod \u00e4r skriven i C och distribueras under en licens som \u00e4r n\u00e4ra MIT.      <\/p>\n<p>I den nya versionen har flera s\u00e4kerhetsproblem \u00e5tg\u00e4rdats:  <\/p>\n<ul>\n<li class=\"l\"> Ofullst\u00e4ndig \u00e5tg\u00e4rd av s\u00e5rbarheten i scp (CVE-2019-6111), som g\u00f6r det m\u00f6jligt att skriva \u00f6ver andra filer n\u00e4r man ansluter till en skadlig <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/server\/dts-shicago\/\" title=\"servern\" data-wpil-keyword-link=\"linked\">servern<\/a>. N\u00e4r scp anv\u00e4nds <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\">server<\/a> beslutar vilka filer och kataloger som ska skickas till klienten, och klienten kontrollerar endast korrektheten hos de \u00e5terv\u00e4ndande objekt namnen. Kontroll p\u00e5 klientsidan blockerar att man g\u00e5r utanf\u00f6r den aktuella katalogen (&#171;..&#187;), men i fallet med rekursiv kopiering (-r) tar den inte h\u00e4nsyn till fall d\u00e4r kataloger med namn som skiljer sig fr\u00e5n de ursprungligen beg\u00e4rda \u00f6verf\u00f6rs. Problemet har l\u00f6sts genom att f\u00f6rbjuda anv\u00e4ndning av alternativet &#171;-r&#187; med en redan existerande m\u00e5lkatalog.\n<li class=\"l\"> S\u00e5rbarhet (CVE-2026-35385) i scp-verktyget, p\u00e5 grund av vilken flaggorna setuid\/setgid inte rensades efter att en fil med root-r\u00e4ttigheter laddats upp med alternativet &#171;-O&#187; och utan alternativet &#171;-p&#187;.\n<li class=\"l\"> M\u00f6jlighet att kringg\u00e5 exekvering av kommandot &#171;forced_command&#187; i konfigurationen authorized_keys vid autentiserad anv\u00e4ndares inloggning med anv\u00e4ndning av alternativet &#171;-t&#187; (inloggning med l\u00f6senords- och offentlig nyckelverifiering).\n<li class=\"l\"> Tj\u00e4nsteavbrott genom att en lokal anv\u00e4ndare skapar en specialfil med namnet authorized_keys, vilket blockerar l\u00e4soperationer.\n<li class=\"l\"> L\u00e4sning av data fr\u00e5n utanf\u00f6r buffertomr\u00e5det vid skapandet av omdirigeringshanterare f\u00f6r klient- och serverf\u00f6rfr\u00e5gningar, vilket kan leda till st\u00e4ngning av godtyckliga filbeskrivare.    <\/ul>\n<p>Icke-s\u00e4kerhetsrelaterade \u00e4ndringar:  <\/p>\n<ul>\n<li class=\"l\"> I ssh har alternativet &#171;-R&#187; lagts till f\u00f6r att vidarebefordra unix-sockets genom en SSH-tunnel.\n<li class=\"l\"> I ssd har alternativet &#171;-M&#187; lagts till f\u00f6r att begr\u00e4nsa den maximala varaktigheten av en session.\n<li class=\"l\"> I &#171;authorized_keys&#187; har alternativet &#171;permitlisten&#187; lagts till f\u00f6r att begr\u00e4nsa till\u00e5tna portar.\n<li class=\"l\"> St\u00f6det f\u00f6r RSA-nycklar skapade i dropbearkey 0.32 eller tidigare versioner av detta verktyg har upph\u00f6rt, vilket g\u00f6r dem s\u00e5rbara f\u00f6r sidokanalsattacker som utv\u00e4rderar tidsdifferensen i behandling av data som har och inte har hamnat i cache.\n<li class=\"l\"> F\u00f6r att blockera brutna f\u00f6rs\u00f6k av \u00f6ppna nycklar p\u00e5 v\u00e4rdarna begr\u00e4nsas antalet f\u00f6rfr\u00e5gningar om \u00f6ppna nycklar till 15 f\u00f6rs\u00f6k per session.        <\/ul>\n<p>K\u00e4lla: <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 5.0.4 - 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, 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