{"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\/fr\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","title":{"rendered":"Un backdoor a \u00e9t\u00e9 trouv\u00e9 dans Webmin, permettant d'acc\u00e9der \u00e0 distance avec des droits root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dans le paquet Webmin<\/a><\/noindex>, fournissant des moyens pour g\u00e9rer un serveur \u00e0 distance, un backdoor a \u00e9t\u00e9<\/a><\/noindex> d\u00e9couvert (CVE-2019-15107<\/a><\/noindex>), d\u00e9tect\u00e9 dans les versions officielles du projet, distribu\u00e9es<\/a><\/noindex> via Sourceforge et recommand\u00e9es<\/a><\/noindex> sur le site principal. Le backdoor \u00e9tait pr\u00e9sent dans les versions allant de 1.882 \u00e0 1.921 incluses (le code avec le backdoor \u00e9tait absent dans le d\u00e9p\u00f4t git) et permettait d'ex\u00e9cuter \u00e0 distance des commandes shell arbitraires dans le syst\u00e8me avec des droits root, sans passer par l'authentification. <\/p>\n

Pour l'attaque, il suffit d'avoir un port r\u00e9seau ouvert avec Webmin et que la fonction de changement de mot de passe obsol\u00e8te soit active dans l'interface web (activ\u00e9e par d\u00e9faut dans les versions 1.890, mais d\u00e9sactiv\u00e9e dans les autres versions). Le probl\u00e8me a \u00e9t\u00e9 corrig\u00e9e<\/a><\/noindex> dans la mise \u00e0 jour<\/a><\/noindex> 1.930. En tant que solution temporaire pour bloquer le backdoor, il suffit de retirer le param\u00e8tre \u00ab passwd_mode= \u00bb du fichier de configuration \/etc\/webmin\/miniserv.conf. Un test a \u00e9t\u00e9 pr\u00e9par\u00e9 prototype d'exploit<\/a><\/noindex>.<\/p>\n

Le probl\u00e8me a \u00e9t\u00e9 d\u00e9tect\u00e9<\/a><\/noindex> dans le script password_change.cgi, o\u00f9 pour v\u00e9rifier le mot de passe pr\u00e9c\u00e9dent saisi dans le formulaire web, on utilise<\/a><\/noindex> la fonction unix_crypt re\u00e7oit le mot de passe fourni par l'utilisateur sans \u00e9chapper les caract\u00e8res sp\u00e9ciaux. Dans le d\u00e9p\u00f4t git, cette fonction est<\/a><\/noindex> avec le module Crypt::UnixCrypt et ne pr\u00e9sente pas de danger, mais dans l'archive de code fournie sur le site Sourceforge, un code est appel\u00e9 qui acc\u00e8de directement \u00e0 \/etc\/shadow, mais ce faisant via une construction shell. Pour l'attaque, il suffit d'indiquer dans le champ du mot de passe ancien le symbole \u00ab | \u00bb et le code suivant sera ex\u00e9cut\u00e9 avec les droits root sur le serveur.<\/p>\n

Selon d\u00e9claration<\/a><\/noindex> des d\u00e9veloppeurs de Webmin, le code malveillant a \u00e9t\u00e9 ins\u00e9r\u00e9 \u00e0 la suite d'une compromission de l'infrastructure du projet. Les d\u00e9tails ne sont pas encore divulgu\u00e9s, donc il n'est pas clair si le piratage s'est limit\u00e9 \u00e0 la prise de contr\u00f4le du compte Sourceforge ou si d'autres \u00e9l\u00e9ments de l'infrastructure de d\u00e9veloppement et de construction de Webmin ont \u00e9galement \u00e9t\u00e9 touch\u00e9s. Le code malveillant \u00e9tait pr\u00e9sent dans les archives depuis mars 2018. Le probl\u00e8me a \u00e9galement affect\u00e9 les versions Usermin<\/a><\/noindex>. Actuellement, tous les archives de d\u00e9marrage ont \u00e9t\u00e9 reconstruites \u00e0 partir de Git.<\/p>\n

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

Source : 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-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\udd47Un backdoor a \u00e9t\u00e9 trouv\u00e9 dans Webmin, permettant un acc\u00e8s \u00e0 distance avec des droits root | ProHoster","description":"Dans le paquet Webmin, fournissant des moyens pour g\u00e9rer un serveur \u00e0 distance,","canonical_url":"https:\/\/prohoster.info\/fr\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"fr_FR","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 root | ProHoster","og:description":"\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,","og:url":"https:\/\/prohoster.info\/fr\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2019-10-31T19:16:49+00:00","article:modified_time":"2019-10-31T19:16:49+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"37292","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-01-23 17:08:31","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-03-01 01:29:59","updated":"2026-01-23 17:08:31","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts\/37292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/comments?post=37292"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts\/37292\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/media?parent=37292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/categories?post=37292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/tags?post=37292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}