{"id":154530,"date":"2026-01-20T23:11:56","date_gmt":"2026-01-20T21:11:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-telnetd-pozvolyayushhaya-podklyuchitsya-s-pravami-root-bez-autentifikaczii"},"modified":"2026-01-20T23:11:56","modified_gmt":"2026-01-20T21:11:56","slug":"uyazvimost-v-telnetd-pozvolyayushhaya-podklyuchitsya-s-pravami-root-bez-autentifikaczii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-telnetd-pozvolyayushhaya-podklyuchitsya-s-pravami-root-bez-autentifikaczii","title":{"rendered":"Vulnerabilitate \u00een telnetd, permit\u00e2nd conectarea cu drepturi de root f\u0103r\u0103 autentificare","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen serverul telnetd din setul GNU InetUtils a fost descoperit\u0103 o vulnerabilitate care permite conectarea sub orice utilizator, inclusiv utilizatorul root, f\u0103r\u0103 verificarea parolei. Identificatorul CVE nu a fost \u00eenc\u0103 atribuit. Aceast\u0103 vulnerabilitate apare \u00eencep\u00e2nd cu versiunea InetUtils 1.9.3 (anul 2015) \u0219i r\u0103m\u00e2ne necorespunz\u0103toare \u00een versiunea actual\u0103 2.7.0. Corec\u021bia este disponibil\u0103 sub form\u0103 de patch-uri (1, 2). <\/p>\n

Problema este cauzat\u0103 de faptul c\u0103, pentru verificarea parolei, procesul telnetd apeleaz\u0103 utilitarul \u00ab\/usr\/bin\/login\u00bb, transmi\u021b\u00e2nd ca argument numele de utilizator specificat de client la conectare la server<\/a>. Utilitarul \u00ablogin\u00bb accept\u0103 op\u021biunea \u00ab-f\u00bb, care permite autentificarea f\u0103r\u0103 a efectua verificarea (se presupune c\u0103 aceast\u0103 op\u021biune este utilizat\u0103 c\u00e2nd utilizatorul a fost deja autenticat). Astfel, dac\u0103 reu\u0219e\u0219ti s\u0103 substitui op\u021biunea \u00ab-f\u00bb \u00een numele de utilizator, po\u021bi s\u0103 te conectezi f\u0103r\u0103 a verifica parola. <\/p>\n

La o conectare obi\u0219nuit\u0103, utilizarea unui nume de utilizator de forma \u00ab-f root\u00bb nu este posibil\u0103, dar \u00een telnet exist\u0103 un mod de conectare automat\u0103, activat prin op\u021biunea \u00ab-a\u00bb. \u00cen acest mod, numele de utilizator nu este luat din linia de comand\u0103, ci este transmis prin variabila de mediu USER. C\u00e2nd este apelat utilitarul login, valoarea acestei variabile de mediu era substituit\u0103 f\u0103r\u0103 verific\u0103ri suplimentare \u0219i f\u0103r\u0103 a sc\u0103pa caracterele speciale. Astfel, pentru a te conecta ca utilizator root, este suficient s\u0103 setezi \u00een variabila de mediu USER valoarea \u00ab-f root\u00bb \u0219i s\u0103 te conectezi la serverul telnet specific\u00e2nd op\u021biunea \u00ab-a\u00bb: $ USER='-f root' telnet -a nume_server <\/p>\n

Modificarea care a dus la vulnerabilitate a fost ad\u0103ugat\u0103 \u00een codul telnetd \u00een martie 2015 \u0219i a fost legat\u0103 de rezolvarea unei probleme care nu permitea determinarea numelui de utilizator \u00een modul autologin f\u0103r\u0103 autentificare Kerberos. Ca solu\u021bie, a fost ad\u0103ugat suportul pentru transmiterea numelui de utilizator pentru modul autologin printr-o variabil\u0103 de mediu, dar verificarea corectitudinii numelui de utilizator din variabila de mediu a fost uitat\u0103.
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0441\u0435\u0440\u0432\u0435\u0440\u0435 telnetd \u0438\u0437 \u043d\u0430\u0431\u043e\u0440\u0430 GNU InetUtils \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u0434 \u043b\u044e\u0431\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f root, \u0431\u0435\u0437 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u0430\u0440\u043e\u043b\u044f. CVE-\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u043f\u043e\u043a\u0430 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 InetUtils 1.9.3 (2015 \u0433\u043e\u0434) \u0438 \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0432 \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 2.7.0. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0432 \u0444\u043e\u0440\u043c\u0435 \u043f\u0430\u0442\u0447\u0435\u0439 (1, 2). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u0430\u0440\u043e\u043b\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441 […]<\/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-154530","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\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\udd47 Vulnerabilitate \u00een telnetd, permit\u00e2nd conectarea cu drepturi de root f\u0103r\u0103 autentificare | ProHoster","description":"\u00cen serverul telnetd din setul GNU InetUtils a fost descoperit\u0103 o vulnerabilitate care permite conectarea sub orice utilizator, inclusiv utilizatorul root, f\u0103r\u0103 verificarea parolei.","canonical_url":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-telnetd-pozvolyayushhaya-podklyuchitsya-s-pravami-root-bez-autentifikaczii","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"ro_RO","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 telnetd, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0438\u0442\u044c\u0441\u044f \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root 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