{"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\/et\/blog\/news\/uyazvimost-v-telnetd-pozvolyayushhaya-podklyuchitsya-s-pravami-root-bez-autentifikaczii","title":{"rendered":"Telnetd haavatavus, mis v\u00f5imaldab root-\u00f5igustega sisselogimist ilma autentimiseta","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

GNU InetUtils telnetd server has a vulnerability that allows connection as any user, including the root user, without password verification. A CVE identifier has not yet been assigned. The vulnerability has existed since InetUtils version 1.9.3 (2015) and remains unfixed in the current release 2.7.0. A fix is available in the form of patches (1, 2). <\/p>\n

Probleem tuleneb sellest, et parooli kontrollimise protsess telnetd kutsub utiliiti , edastades parameetrina kasutajanime, mille klient sisestas \u00fchenduse loomisel serveri<\/a>. Utiliit toetab valikut , mis v\u00f5imaldab sisse logida ilma autentimiseta (eeldatakse, et seda valikut kasutatakse, kui kasutaja on juba kontrollitud). Nii et kui saavutada, et valikut kasutatakse kasutajanimes, saab sisse logida ilma parooli kontrollimata. <\/p>\n

Tavalise \u00fchenduse kasutamisel ei saa kasutada kasutajanime kujul , kuid telnetis on automaatse \u00fchendamise re\u017eiim, mida aktiveeritakse valikuga . Selles re\u017eiimis v\u00f5etakse kasutajanimi mitte k\u00e4surealt, vaid see edastatakse keskkonnamuutuja USER kaudu. Utiliidi login kutsub selle keskkonnamuutuja v\u00e4\u00e4rtuse \u00fcles ilma t\u00e4iendava kontrollita ja ilma erim\u00e4rkide p\u00f5genemiseta. Seega, et sisse logida kasutajana root, piisab, kui seada keskkonnamuutuj USER v\u00e4\u00e4rtuseks ning luua \u00fchendus telnet-serveriga, m\u00e4\u00e4rates valiku : $ USER='-f root' telnet -a serveri_nimi <\/p>\n

The change that led to the vulnerability was added to the telnetd code in March 2015 and was related to fixing a problem that did not allow the username to be determined in autologin mode without authentication in Kerberos. As a solution, support for passing the username for autologin mode through an environment variable was added, but they forgot to add the validation of the username from the environment variable.
\n
Allikas: opennet.ru<\/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. 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