{"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\/nl\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","title":{"rendered":"In Webmin is een backdoor gevonden die toegang op afstand met rootrechten mogelijk maakt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>In het pakket <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/webmin\/webmin\/\">Webmin<\/a><\/noindex>, dat middelen biedt voor afstandsbeheer van de server, <noindex><a rel=\"nofollow\" href=\"https:\/\/groups.google.com\/forum\/#!msg\/virtualmin-announce\/hCCtMJfvhTI\/_JOodz2BDQAJ\">ge\u00efdentificeerd<\/a><\/noindex> backdoor (<noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2019-15107\">CVE-2019-15107<\/a><\/noindex>), ontdekt in de offici\u00eble builds van het project, <noindex><a rel=\"nofollow\" href=\"https:\/\/sourceforge.net\/projects\/webadmin\/files\/webmin\/\">verspreid<\/a><\/noindex> via Sourceforge en <noindex><a rel=\"nofollow\" href=\"http:\/\/webmin.com\/download.html\">aanbevolen<\/a><\/noindex> op de hoofdwebsite. De backdoor was aanwezig in builds van 1.882 tot en met 1.921 (de code met backdoor was niet aanwezig in de git-repository) en stelde de aanvaller in staat om op afstand willekeurige shell-opdrachten uit te voeren in het systeem met root-rechten zonder authenticatie. <\/p>\n<p>Voor een aanval is het voldoende dat er een open netwerkpoort met Webmin is en dat de functie voor het wijzigen van het verouderde wachtwoord actief is in de webinterface (standaard ingeschakeld in builds 1.890, maar in andere versies uitgeschakeld). Probleem <noindex><a rel=\"nofollow\" href=\"http:\/\/webmin.com\/security.html\">opgelost<\/a><\/noindex> in <noindex><a rel=\"nofollow\" href=\"https:\/\/groups.google.com\/forum\/#!msg\/virtualmin-announce\/hCCtMJfvhTI\/_JOodz2BDQAJ\">update<\/a><\/noindex> 1.930. Als tijdelijke maatregel om de backdoor te blokkeren, is het voldoende om de instelling 'passwd_mode=' uit het configuratiebestand \/etc\/webmin\/miniserv.conf te verwijderen. Voor testdoeleinden is het voorbereid. <noindex><a rel=\"nofollow\" href=\"https:\/\/pentest.com.tr\/exploits\/DEFCON-Webmin-1920-Unauthenticated-Remote-Command-Execution.html\">een exploit-prototype<\/a><\/noindex>.<\/p>\n<p>Het probleem was <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.firosolutions.com\/exploits\/webmin\/\">ontdekt<\/a><\/noindex> in het script password_change.cgi, waarin de functie unix_crypt wordt gebruikt om het ingevoerde oude wachtwoord in het webformulier te controleren, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/webmin\/webmin\/blob\/e89ffcfa6961274e00e7565217fb98fa28596cd7\/password_change.cgi#L163\">de DNS-server van CloudFlare wordt gebruikt, zal in Chrome slechts de methode van de DNS-verwerking worden bijgewerkt naar een equivalente service, zonder wisseling van de DNS-provider. Bijvoorbeeld, als een gebruiker in de systeeminstellingen de DNS 8.8.8.8 heeft opgegeven, zal in Chrome<\/a><\/noindex> en waarbij het door de gebruiker ingegeven wachtwoord zonder speciale tekens te escapen, wordt doorgegeven. In de git-repository is deze functie <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/webmin\/webmin\/blob\/1e2545b06e3ab875bb5e1edfbe01d8ae6f58af23\/web-lib-funcs.pl#L10118\">is<\/a><\/noindex>  boven de Crypt::UnixCrypt-module en vormt geen gevaar, maar in het op de website van Sourceforge geleverde archief met code wordt code aangeroepen die rechtstreeks naar \/etc\/shadow verwijst, maar dit gebeurt met behulp van een shell-constructie. Voor een aanval is het voldoende om het symbool '|' in het veld voor het oude wachtwoord in te voegen, waarna de code die volgt, met root-rechten op de server zal worden uitgevoerd.<\/p>\n<p>Volgens <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/netsec\/comments\/crk77z\/0day_remote_code_execution_for_webmin\/excgwnt\/\">verklaring<\/a><\/noindex> van de ontwikkelaars van Webmin, werd de schadelijke code ingevoegd als gevolg van compromittering van de infrastructuur van het project. Details worden nog niet bekendgemaakt, dus het is onduidelijk of de hack beperkt was tot het overnemen van de controle over het account op Sourceforge of andere elementen van de ontwikkelings- en build-infrastructuur van Webmin heeft aangetast. Schadelijke code was aanwezig in de archieven sinds maart 2018. Het probleem heeft ook invloed gehad op <noindex><a rel=\"nofollow\" href=\"https:\/\/sourceforge.net\/projects\/webadmin\/files\/usermin\/\">Usermin builds<\/a><\/noindex>. Op dit moment zijn alle opstartarchieven opnieuw samengesteld vanuit Git.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Bron: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51315\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&hellip;]<\/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<!-- All 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