{"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\/hu\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","title":{"rendered":"Dropbear SSH 2026.90 kiad\u00e1s biztons\u00e1gi hib\u00e1k jav\u00edt\u00e1s\u00e1val","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent a Dropbear projekt 2026.90-es kiad\u00e1sa, amely a SSH szerver \u00e9s kliens fejleszt\u00e9s\u00e9vel foglalkozik, sz\u00e9les k\u00f6rben elterjedt vezet\u00e9k n\u00e9lk\u00fcli routerekben \u00e9s hasonl\u00f3 kompakt disztrib\u00faci\u00f3kban, mint p\u00e9ld\u00e1ul az OpenWrt. A Dropbear alacsony mem\u00f3riafogyaszt\u00e1sa, a felesleges funkci\u00f3k letilt\u00e1si lehet\u0151s\u00e9ge a ford\u00edt\u00e1s sor\u00e1n \u00e9s a kliens \u00e9s szerver egyes\u00edt\u00e9s\u00e9nek t\u00e1mogat\u00e1sa egyetlen v\u00e9grehajthat\u00f3 f\u00e1jlba, hasonl\u00f3an a busyboxhoz, jellemzi. Statikus \u00f6sszekapcsol\u00e1s eset\u00e9n az uClibc-vel a Dropbear v\u00e9grehajthat\u00f3 f\u00e1jlja mind\u00f6ssze 110 kB helyet foglal. A Dropbear t\u00e1mogatja az X11 \u00e1tir\u00e1ny\u00edt\u00e1st, kompatibilis az OpenSSH kulcsf\u00e1jllal (~\/.ssh\/authorized_keys), \u00e9s lehet\u0151v\u00e9 teszi a t\u00f6bb kapcsolat l\u00e9trehoz\u00e1s\u00e1t egy tranzit\u00e1l\u00f3 g\u00e9pen kereszt\u00fcl. A projekt k\u00f3dja C nyelven \u00edr\u00f3dott, \u00e9s MIT-hez hasonl\u00f3 licensz alatt terjesztik.      <\/p>\n<p>Az \u00faj verzi\u00f3ban t\u00f6bb biztons\u00e1gi probl\u00e9m\u00e1t jav\u00edtottak:  <\/p>\n<ul>\n<li class=\"l\"> A scp sebezhet\u0151s\u00e9g (CVE-2019-6111) hi\u00e1nyos megsz\u00fcntet\u00e9se, amely lehet\u0151v\u00e9 teszi m\u00e1s f\u00e1jlok fel\u00fcl\u00edr\u00e1s\u00e1t egy rosszindulat\u00fa eszk\u00f6zre val\u00f3 csatlakoz\u00e1s sor\u00e1n. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/dts-shicago\/\" title=\"szerverhez\" data-wpil-keyword-link=\"linked\">szerverhez<\/a>. A scp alkalmaz\u00e1sakor <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/\"   title=\"szerver\" data-wpil-keyword-link=\"linked\">szerver<\/a> d\u00f6nt arr\u00f3l, hogy mely f\u00e1jlokat \u00e9s k\u00f6nyvt\u00e1rakat k\u00fcldj\u00f6n el az \u00fcgyf\u00e9lnek, m\u00edg az \u00fcgyf\u00e9l csak a visszakapott objektumnevek helyess\u00e9g\u00e9t ellen\u0151rzi. Az \u00fcgyf\u00e9ln\u00e9l v\u00e9gzett ellen\u0151rz\u00e9s blokkolja a jelenlegi k\u00f6nyvt\u00e1r hat\u00e1rain t\u00fali hozz\u00e1f\u00e9r\u00e9st (&#171;..&#187;), de rekurz\u00edv m\u00e1sol\u00e1s (-r) eset\u00e9n nem veszi figyelembe azokat az eseteket, amikor a megadott k\u00f6nyvt\u00e1r neve elt\u00e9r az eredetileg k\u00e9rt nev\u00e9kt\u0151l. A probl\u00e9m\u00e1t a m\u00e1r l\u00e9tez\u0151 c\u00e9lk\u00f6nyvt\u00e1rral val\u00f3 &#171;-r&#187; opci\u00f3 haszn\u00e1lat\u00e1nak tilalm\u00e1val oldj\u00e1k meg.\n<li class=\"l\"> A scp seg\u00e9dprogram egy sebezhet\u0151s\u00e9ge (CVE-2026-35385), amely miatt root jogosults\u00e1g\u00fa f\u00e1jlok felt\u00f6lt\u00e9sekor, &#171;-O&#187; opci\u00f3 megad\u00e1s\u00e1val \u00e9s &#171;-p&#187; opci\u00f3 n\u00e9lk\u00fcl nem t\u00f6rl\u0151dtek a setuid\/setgid z\u00e1szl\u00f3k.\n<li class=\"l\"> Lehet\u0151s\u00e9g van a &#171;forced_command&#187; parancs v\u00e9grehajt\u00e1s\u00e1nak kiker\u00fcl\u00e9s\u00e9re az authorized_keys be\u00e1ll\u00edt\u00e1sain\u00e1l, amikor az \u00fcgyf\u00e9l hiteles\u00edtett felhaszn\u00e1l\u00f3 kapcsol\u00f3dik a &#171;-t&#187; opci\u00f3val (jelsz\u00f3 \u00e9s ny\u00edlt kulcs ellen\u0151rz\u00e9s\u00e9vel).\n<li class=\"l\"> A szolg\u00e1ltat\u00e1s megtagad\u00e1sa egy helyi felhaszn\u00e1l\u00f3 \u00e1ltal l\u00e9trehozott specialista f\u00e1jl r\u00e9v\u00e9n, amelynek neve authorized_keys, blokkolja az olvas\u00e1si m\u0171veleteket.\n<li class=\"l\"> Adatok olvas\u00e1sa a puffertartom\u00e1nyon k\u00edv\u00fcl, amikor a kliens- \u00e9s szerverlek\u00e9rdez\u00e9sek \u00e1tir\u00e1ny\u00edt\u00f3it hozz\u00e1k l\u00e9tre, ami tetsz\u0151leges f\u00e1jl le\u00edr\u00f3k z\u00e1r\u00f3d\u00e1s\u00e1hoz vezethet.    <\/ul>\n<p>Nem biztons\u00e1ggal kapcsolatos m\u00f3dos\u00edt\u00e1sok:  <\/p>\n<ul>\n<li class=\"l\"> Az ssh-hoz hozz\u00e1adva lett a &#171;-R&#187; opci\u00f3, amely lehet\u0151v\u00e9 teszi a unix socketek \u00e1tir\u00e1ny\u00edt\u00e1s\u00e1t SSH alag\u00faton kereszt\u00fcl.\n<li class=\"l\"> Az ssd-hez hozz\u00e1adva lett a &#171;-M&#187; opci\u00f3 a maxim\u00e1lis munkamenet id\u0151korl\u00e1toz\u00e1s\u00e1nak be\u00e1ll\u00edt\u00e1s\u00e1hoz.\n<li class=\"l\"> Az &#171;authorized_keys&#187;-ba hozz\u00e1adva lett a &#171;permitlisten&#187; opci\u00f3 a megengedett portok korl\u00e1toz\u00e1s\u00e1hoz.\n<li class=\"l\"> A dropbearkey 0.32 vagy kor\u00e1bbi verzi\u00f3iban k\u00e9sz\u00fclt RSA-kulcsok t\u00e1mogat\u00e1s\u00e1nak megsz\u00fcntet\u00e9se, amelyek \u00e9rz\u00e9kenyek a nem megfelel\u0151en v\u00e9grehajtott id\u0151eltol\u00f3d\u00e1sos t\u00e1mad\u00e1sokra, amelyek az adatok feldolgoz\u00e1s\u00e1nak ideje k\u00f6z\u00f6tti elt\u00e9r\u00e9seket m\u00e9rik, ha az adatok a gyors\u00edt\u00f3t\u00e1rba ker\u00fclnek vagy sem.\n<li class=\"l\"> A nyilv\u00e1nos kulcsok brute-force felt\u00f6r\u00e9s\u00e9nek megakad\u00e1lyoz\u00e1sa \u00e9rdek\u00e9ben a nyilv\u00e1nos kulcsok k\u00e9r\u00e9s\u00e9nek sz\u00e1ma 15 pr\u00f3b\u00e1lkoz\u00e1sra korl\u00e1toz\u00f3dik minden egyes munkamenet sor\u00e1n.        <\/ul>\n<p>Forr\u00e1s: <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, 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OpenWrt-ben.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 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