{"id":123597,"date":"2025-04-18T15:05:07","date_gmt":"2025-04-18T13:05:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ssh-servere-iz-erlang-otp-dopuskayushhaya-udalyonnoe-vypolnenie-koda"},"modified":"2025-04-18T15:05:07","modified_gmt":"2025-04-18T13:05:07","slug":"uyazvimost-v-ssh-servere-iz-erlang-otp-dopuskayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-ssh-servere-iz-erlang-otp-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Zranitelnost v SSH serveru z Erlang\/OTP umo\u017e\u0148uj\u00edc\u00ed vzd\u00e1len\u00e9 vykon\u00e1n\u00ed k\u00f3du","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V knihovn\u011b ssh, kter\u00e1 je sou\u010d\u00e1st\u00ed n\u00e1stroj\u016f Erlang\/OTP, byla zji\u0161t\u011bna zranitelnost (CVE-2025-32433), je\u017e umo\u017e\u0148uje vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed vlastn\u00edho k\u00f3du na SSH serveru vytvo\u0159en\u00e9m s pou\u017eit\u00edm zraniteln\u00e9 knihovny bez autentizace. Probl\u00e9m byl ozna\u010den jako kritick\u00fd (10 z 10). <\/p>\n

Jeden z bezpe\u010dnostn\u00edch v\u00fdzkumn\u00edk\u016f ji\u017e p\u0159ipravil funk\u010dn\u00ed exploit pro prov\u00e1d\u011bn\u00ed k\u00f3du na zraniteln\u00fdch SSH serverech. Podle tvrzen\u00ed v\u00fdzkumn\u00edka byl k\u00f3d vytvo\u0159en s pomoc\u00ed AI asistent\u016f jako GPT-4, Cursor a Sonnet na z\u00e1klad\u011b anal\u00fdzy zm\u011bny s opravou zranitelnosti, v\u010detn\u011b testu pro ov\u011b\u0159en\u00ed odstran\u011bn\u00ed probl\u00e9mu. <\/p>\n

Knihovna z projektu Erlang\/OTP poskytuje hotov\u00e9 implementace klienta a serveru<\/a> SSH a SFTP, podporuj\u00edc\u00ed protokol SSH 2.0. Probl\u00e9mov\u00e9 SSH servery lze rozli\u0161it podle v\u00fdstupu hlavi\u010dky \"SSH-2.0-Erlang\/verze\". SSH servery zalo\u017een\u00e9 na Erlang\/OTP se pou\u017e\u00edvaj\u00ed ve specializovan\u00fdch syst\u00e9mech, nap\u0159\u00edklad na IoT a za\u0159\u00edzen\u00edch pro edge computing, a tak\u00e9 jako n\u00e1stroj pro lad\u011bn\u00ed \u2014 Erlang umo\u017e\u0148uje snadno aktivovat SSH server pro vzd\u00e1len\u00e9 lad\u011bn\u00ed sv\u00fdch aplikac\u00ed (p\u0159edpokl\u00e1d\u00e1 se, \u017ee tato ladic\u00ed funkce mohla b\u00fdt ponech\u00e1na aktivn\u00ed v mnoha projektech napsan\u00fdch v Erlangu). Probl\u00e9m se tak\u00e9 projevuje v n\u00e1stroj\u00edch Elixir (implementovan\u00fdch nad Erlang) a ve frameworku Phoenix na jeho z\u00e1klad\u011b, ale SSH server v Phoenixu ve v\u00fdchoz\u00edm nastaven\u00ed nep\u0159ij\u00edm\u00e1 \u017e\u00e1dosti z extern\u00edch s\u00edt\u00ed. <\/p>\n

Zranitelnost je zp\u016fsobena chybou v k\u00f3du pro anal\u00fdzu zpr\u00e1v, kv\u016fli kter\u00e9 byly zpr\u00e1vy SSH_MSG_CHANNEL_REQUEST, umo\u017e\u0148uj\u00edc\u00ed proveden\u00ed p\u0159\u00edkazu \"exec\", zpracov\u00e1v\u00e1ny ve stadiu p\u0159ed autentizac\u00ed. P\u0159\u00edklad k\u00f3du z exploitu: command = 'file:write_file(\"\/lab.txt\", <>).' return ( b'x62' # SSH_MSG_CHANNEL_REQUEST + struct.pack('>I', channel_id) + string_payload('exec') + b'x01' # want_reply = true + string_payload(command) ) <\/p>\n

Zranitelnost byla odstran\u011bna v verz\u00edch Erlang\/OTP-27.3.3, 26.2.5.11 a 25.3.2.20. O odstran\u011bn\u00ed zranitelnosti v distribuc\u00edch m\u016f\u017eete sledovat na n\u00e1sleduj\u00edc\u00edch str\u00e1nk\u00e1ch: Debian, Ubuntu, Fedora, SUSE\/openSUSE, RHEL, Arch, FreeBSD.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u0447\u0442\u043e \u043f\u043e \u0441\u043b\u043e\u0432\u0430\u043c \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043a\u043e\u0434 \u0431\u044b\u043b […]<\/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-123597","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Zranitelnost v SSH serveru z Erlang\/OTP, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed k\u00f3du | ProHoster","description":"V knihovn\u011b ssh, kter\u00e1 je sou\u010d\u00e1st\u00ed n\u00e1stroj\u016f Erlang\/OTP, byla zji\u0161t\u011bna zranitelnost (CVE-2025-32433), je\u017e umo\u017e\u0148uje vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed vlastn\u00edho k\u00f3du na SSH serveru vytvo\u0159en\u00e9m s pou\u017eit\u00edm.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-ssh-servere-iz-erlang-otp-dopuskayushhaya-udalyonnoe-vypolnenie-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 SSH-\u0441\u0435\u0440\u0432\u0435\u0440\u0435 \u0438\u0437 Erlang\/OTP, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 | ProHoster","og:description":"\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 ssh, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f Erlang\/OTP, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-32433), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 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