{"id":162791,"date":"2026-02-25T17:11:54","date_gmt":"2026-02-25T15:11:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/seriya-novyh-uyazvimostej-v-telnetd-pozvolyayushhih-poluchit-root-privilegii-v-sisteme"},"modified":"2026-02-25T17:11:54","modified_gmt":"2026-02-25T15:11:54","slug":"seriya-novyh-uyazvimostej-v-telnetd-pozvolyayushhih-poluchit-root-privilegii-v-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/seriya-novyh-uyazvimostej-v-telnetd-pozvolyayushhih-poluchit-root-privilegii-v-sisteme","title":{"rendered":"Una serie di nuove vulnerabilit\u00e0 in telnetd consente di ottenere i privilegi di root nel sistema","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dopo la vulnerabilit\u00e0 scoperta alla fine di gennaio che permetteva di connettersi come utente root senza verifica della password, nel server telnetd del pacchetto GNU InetUtils sono state individuate diverse modalit\u00e0 di elevazione dei privilegi, derivanti da una mitigazione incompleta della vulnerabilit\u00e0 del 1999 (CVE-1999-0073).     <\/p>\n<p>Le vulnerabilit\u00e0 sono causate dalla possibilit\u00e0 di telnetd di trasmettere variabili d'ambiente dal client al server tramite l'opzione ENVIRON. Tali variabili d'ambiente vengono impostate e gestite nel contesto del processo telnetd e trasmesse ai suoi processi figlio in esecuzione, incluso il processo \/bin\/login avviato con i privilegi di root. La vulnerabilit\u00e0 CVE-1999-0073 consentiva al client telnet di trasferire la variabile d'ambiente LD_LIBRARY_PATH, la cui impostazione causa il caricamento della libreria condivisa specificata dall'utente durante l'esecuzione del processo di accesso. Con la possibilit\u00e0 di caricare file su un sistema che supporta la connessione tramite protocollo telnet, un attaccante pu\u00f2 caricare una libreria appositamente creata e forzarne il caricamento con privilegi di root.      <\/p>\n<p>Nella versione telnetd del pacchetto GNU InetUtils \u00e8 stata risolta una vulnerabilit\u00e0 vietando variabili di ambiente pericolose tramite filtraggio per maschere come \u00abLD_\u00bb, \u00abLIBPATH\u00bb, \u00abENV\u00bb, \u00abIFS\u00bb e \u00ab_RLD_\u00bb. Tuttavia, la variabile d'ambiente \u00abCREDENTIALS_DIRECTORY\u00bb \u00e8 rimasta sbloccata, elaborata all'avvio di \/usr\/bin\/login. Utilizzando questa variabile d'ambiente, un utente poteva cambiare la directory delle impostazioni delle credenziali e posizionare un file login.noauth nella nuova directory con il valore \u00abyes\u00bb, attivando l'accesso senza password (simile all'invio del flag \u00ab-f\u00bb al processo login). Questa configurazione si applica a tutti gli utenti, incluso root.     <\/p>\n<p>L'attacco consiste nella creazione, da parte di un utente non privilegiato, di una sottodirectory nella propria home directory, caricando un file login.noauth al suo interno e tentando di accedere impostando la variabile d'ambiente \u00abCREDENTIALS_DIRECTORY=directory creata\u00bb e passando la variabile d'ambiente \u00abUSER=root\u00bb (nel telnet \u00e8 presente una modalit\u00e0 di connessione automatica, in cui il nome utente non viene preso dalla riga di comando, ma passato tramite la variabile d'ambiente USER). Ecco un esempio di exploit.    <\/p>\n<p>\u00c8 stato identificato un ulteriore metodo per ottenere l'accesso root tramite telnetd, legato alla manipolazione delle variabili d'ambiente OUTPUT_CHARSET e LANGUAGE, elaborate dalla libreria GNU gettext, e alla variabile d'ambiente GCONV_PATH, utilizzata in glibc. Impostando le variabili d'ambiente OUTPUT_CHARSET e LANGUAGE, un attaccante pu\u00f2 attivare in gettext la funzionalit\u00e0 di conversione della codifica dei caratteri, che chiama la funzione iconv_open(). A sua volta, durante l'esecuzione della funzione iconv_open() al caricamento del file di configurazione gconv-modules, il percorso viene calcolato tenendo conto della variabile d'ambiente GCONV_PATH. Sostituendo il file gconv-modules, \u00e8 possibile organizzare il caricamento di una propria libreria condivisa durante l'output di una stringa localizzata dal processo di login.                <\/p>\n<p>Gli identificatori CVE non sono stati ancora assegnati alle vulnerabilit\u00e0 segnalate. Come metodo di protezione, si sta considerando l'uso di una lista bianca di valori accettabili (&#171;TERM&#187;, &#171;DISPLAY&#187;, &#171;USER&#187;, &#171;LOGNAME&#187; e &#171;POSIXLY_CORRECT&#187;), bloccando tutte le altre variabili ambientali, analogamente a come vengono gestite le variabili ambientali in OpenSSH. Le vulnerabilit\u00e0 sono state confermate nel pacchetto GNU InetUtils, implementazione <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-los-angeles\/\" title=\"server\" data-wpil-keyword-link=\"linked\">server<\/a> telnetd fornito su Debian, Ubuntu e distribuzioni derivate. Le patch per GNU InetUtils sono ancora assenti. In Rocky Linux 9 \u00e8 presente una versione modificata di telnetd non vulnerabile, che implementa un controllo basato su whitelist invece della filtrazione delle variabili d'ambiente pericolose. Anche telnetd in FreeBSD ha attuato la filtrazione per whitelist. In OpenBSD telnetd \u00e8 stato rimosso dal sistema nel 2005.<br \/>\n<br \/>Fonte: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=64869\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043b\u0435\u0434\u043e\u043c \u0437\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0432 \u043a\u043e\u043d\u0446\u0435 \u044f\u043d\u0432\u0430\u0440\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c\u044e, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0432\u0448\u0435\u0439 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u0434 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c root \u0431\u0435\u0437 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u0430\u0440\u043e\u043b\u044f, \u0432 \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\u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u043f\u043e\u0441\u043e\u0431\u043e\u0432 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0438\u0445 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439, \u0441\u0442\u0430\u0432\u0448\u0438\u0445 \u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435\u043c \u043d\u0435\u043f\u043e\u043b\u043d\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 1999 \u0433\u043e\u0434\u0443 (CVE-1999-0073). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432\u044b\u0437\u0432\u0430\u043d\u044b \u043d\u0430\u043b\u0438\u0447\u0438\u0435\u043c \u0432 telnetd \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u043c \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043e\u043f\u0446\u0438\u0438 ENVIRON. \u041f\u043e\u0434\u043e\u0431\u043d\u044b\u0435 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 [&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-162791","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043b\u0435\u0434\u043e\u043c \u0437\u0430 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(CVE-1999-0073). 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