{"id":37292,"date":"2019-10-31T22:16:49","date_gmt":"2019-10-31T19:16:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root\/"},"modified":"2019-10-31T22:16:49","modified_gmt":"2019-10-31T19:16:49","slug":"v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","title":{"rendered":"In Webmin \u00e8 stata trovata una backdoor che consente l'accesso remoto con privilegi di root.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nel pacchetto Webmin<\/a><\/noindex>, che fornisce strumenti per la gestione remota del server, \u00e8 stato rilevato<\/a><\/noindex> la backdoor (CVE-2019-15107<\/a><\/noindex>), scoperta nelle compilazioni ufficiali del progetto, distribuite<\/a><\/noindex> attraverso Sourceforge e raccomandate<\/a><\/noindex> sul sito principale. La backdoor era presente nelle compilazioni dalla 1.882 alla 1.921 inclusa (nel repository git il codice con la backdoor era assente) e consentiva di eseguire comandi shell arbitrar\u00ee nel sistema con privilegi di root senza passare per l'autenticazione. <\/p>\n

Per attaccare, \u00e8 sufficiente avere una porta di rete aperta con Webmin e l'attivit\u00e0 nell'interfaccia web della funzione di cambio della password obsoleta (abilitata per default nelle compilazioni 1.890, ma disabilitata nelle altre versioni). Il problema risolto<\/a><\/noindex> in \u00e8 stato risolto<\/a><\/noindex> 1.930. Come misura temporanea per bloccare il backdoor, \u00e8 sufficiente rimuovere l'impostazione «passwd_mode=» dal file di configurazione \/etc\/webmin\/miniserv.conf. \u00c8 stato preparato per il test prototipo di exploit<\/a><\/noindex>.<\/p>\n

Il problema \u00e8 stato individuato<\/a><\/noindex> nello script password_change.cgi, dove per verificare la vecchia password inserita nel modulo web. viene utilizzato<\/a><\/noindex> la funzione unix_crypt, alla quale viene passato il password fornita dall'utente senza eseguire l'escape dei caratteri speciali. Nel repository git, questa funzione \u00e8<\/a><\/noindex> una libreria sopra il modulo Crypt::UnixCrypt e non rappresenta un pericolo, ma nel pacchetto del codice fornito sul sito di Sourceforge viene eseguito un codice che accede direttamente a \/etc\/shadow, ma lo fa tramite una costruzione shell. Per effettuare l'attacco, \u00e8 sufficiente inserire nel campo della vecchia password il carattere «|» e il codice successivo sar\u00e0 eseguito con i diritti di root sul server.<\/p>\n

Secondo dichiarazione<\/a><\/noindex> degli sviluppatori di Webmin, il codice dannoso \u00e8 stato inserito a seguito di una compromissione dell'infrastruttura del progetto. Non sono ancora forniti dettagli, quindi non \u00e8 chiaro se l'hacking si sia limitato a prendere il controllo dell'account su Sourceforge o abbia coinvolto anche altri elementi dell'infrastruttura di sviluppo e costruzione di Webmin. Il codice dannoso \u00e8 stato presente nei pacchetti da marzo 2018. Il problema ha anche coinvolto le build di Usermin<\/a><\/noindex>. Attualmente tutti i pacchetti di avvio sono stati ricostruiti da Git.<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 Webmin, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u043c \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c, \u0432\u044b\u044f\u0432\u043b\u0435\u043d \u0431\u044d\u043a\u0434\u043e\u0440 (CVE-2019-15107), \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u043d\u044b\u0439 \u0432 \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u0431\u043e\u0440\u043a\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u043c\u044b\u0445 \u0447\u0435\u0440\u0435\u0437 Sourceforge \u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0441\u0430\u0439\u0442\u0435. \u0411\u044d\u043a\u0434\u043e\u0440 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u043b \u0432 \u0441\u0431\u043e\u0440\u043a\u0430\u0445 \u0441 1.882 \u043f\u043e 1.921 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (\u0432 git-\u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0438 \u043a\u043e\u0434 \u0441 \u0431\u044d\u043a\u0434\u043e\u0440\u043e\u043c \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u043b) \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u043b \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 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0435 shell-\u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u0414\u043b\u044f […]<\/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-37292","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"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\udd47Scoperta una backdoor in Webmin che consente l'accesso remoto con diritti di root | ProHoster","description":"Nel pacchetto Webmin, che offre strumenti per la gestione remota dei server, \u00e8 stata trovata una backdoor (CVE-2019-15107), individuata nelle build ufficiali del progetto distribuite tramite Sourceforge e raccomandate sul sito principale. La backdoor era presente nelle build dalla 1.882 alla 1.921 inclusa (il codice con la backdoor era assente nel repository git) e consentiva di eseguire comandi shell arbitrari nel sistema con diritti di root senza autenticazione. Per","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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 Webmin \u043d\u0430\u0439\u0434\u0435\u043d \u0431\u044d\u043a\u0434\u043e\u0440, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 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