{"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\/ro\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","title":{"rendered":"O backdoor a fost g\u0103sit\u0103 \u00een Webmin, permi\u021b\u00e2nd accesul de la distan\u021b\u0103 cu drepturi de root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen pachetul Webmin<\/a><\/noindex>, care ofer\u0103 instrumente pentru gestionarea de la distan\u021b\u0103 a serverului, a fost identificat<\/a><\/noindex> backdoor (CVE-2019-15107<\/a><\/noindex>), descoperit \u00een versiunile oficiale ale proiectului, distribuite<\/a><\/noindex> prin Sourceforge \u0219i recomandate<\/a><\/noindex> pe site-ul oficial. Backdoor-ul a fost prezent \u00een versiunile de la 1.882 p\u00e2n\u0103 la 1.921 inclusiv (\u00een repositorul git, codul cu backdoor-ul nu era prezent) \u0219i permitea executarea de comenzi shell arbitrare \u00een sistem cu privilegii root, f\u0103r\u0103 a necesita autentificare. <\/p>\n

Pentru atac, este suficient s\u0103 existe un port de re\u021bea deschis cu Webmin \u0219i activitatea \u00een interfa\u021ba web a func\u021biei de schimbare a parolei vechi (activat\u0103 prin default \u00een versiunile 1.890, dar dezactivat\u0103 \u00een celelalte versiunile). Problema remediat\u0103<\/a><\/noindex> \u00een platformei<\/a><\/noindex> 1.930. Ca m\u0103sur\u0103 temporar\u0103 pentru blocarea backdoor-ului, este suficient s\u0103 elimina\u021bi setarea «passwd_mode=» din fi\u0219ierul de configurare \/etc\/webmin\/miniserv.conf. Pentru testare, a fost preg\u0103tit un prototip de exploit<\/a><\/noindex>.<\/p>\n

Problema a fost s-a descoperit<\/a><\/noindex> \u00een scriptul password_change.cgi, \u00een care pentru verificarea parolei vechi introduse \u00een formularul web, se folose\u0219te<\/a><\/noindex> func\u021bia unix_crypt, care prime\u0219te parola utilizatorului f\u0103r\u0103 a efectua escaparea caracterelor speciale. \u00cen repositorul git, aceast\u0103 func\u021bie este<\/a><\/noindex> un wrapper peste modulul Crypt::UnixCrypt \u0219i nu prezint\u0103 un risc, dar \u00een arhiva livrat\u0103 pe site-ul Sourceforge cu codul, este apelat un cod care acceseaz\u0103 direct \/etc\/shadow, dar face acest lucru printr-o construc\u021bie shell. Pentru atac, este suficient s\u0103 specifica\u021bi \u00een c\u00e2mpul cu parola veche simbolul «|» \u0219i codul care urmeaz\u0103 va fi executat cu drepturi de root pe server.<\/p>\n

Dup\u0103 declara\u021biei<\/a><\/noindex> dezvoltatorilor Webmin, codul mali\u021bios a fost introdus ca urmare a compromiterii infrastructurii proiectului. Detaliile nu sunt \u00eenc\u0103 comunicate, a\u0219a c\u0103 nu este clar dac\u0103 bre\u0219a s-a limitat la capturarea controlului asupra contului de pe Sourceforge sau a afectat \u0219i alte elemente ale infrastructurii de dezvoltare \u0219i construire a Webmin. Codul mali\u021bios a fost prezent \u00een arhivele din martie 2018. Problema a afectat de asemenea versiunile Usermin<\/a><\/noindex>. \u00cen prezent, toate arhivele de instalare au fost recompuse din Git.<\/p>\n

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

Sursa: opennet.ro<\/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-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 A fost g\u0103sit un backdoor \u00een Webmin, care permite accesul de la distan\u021b\u0103 cu privilegii root | ProHoster","description":"\u00cen pachetul Webmin, care ofer\u0103 instrumente pentru gestionarea de la distan\u021b\u0103 a 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