{"id":103146,"date":"2022-01-31T15:36:54","date_gmt":"2022-01-31T13:36:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii"},"modified":"2022-01-31T15:36:54","modified_gmt":"2022-01-31T13:36:54","slug":"uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/news\/uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Schw\u00e4che im ucount-Mechanismus des Linux-Kernels, die eine Erh\u00f6hung der Privilegien erm\u00f6glicht.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Im Linux-Kernel wurde eine Schwachstelle im Code zur Verarbeitung von rlimit-Beschr\u00e4nkungen in verschiedenen Benutzer-Namensr\u00e4umen (user namespaces) entdeckt (CVE-2022-24122), die eine Erh\u00f6hung der Privilegien im System erm\u00f6glicht. Das Problem tritt ab Kernel-Version 5.14 auf und wird in den Updates 5.16.5 und 5.15.19 behoben. Die stabilen Versionen von Debian, Ubuntu, SUSE\/openSUSE und RHEL sind nicht betroffen, jedoch zeigt sich das Problem in den aktuellen Kerneln von Fedora und Arch Linux. <\/p>\n

Der Fehler ist in der im Sommer 2021 vorgenommenen \u00c4nderung aufgetreten, die die Implementierung einiger RLIMIT-Z\u00e4hler auf die Verwendung der Struktur «ucounts» umstellt. Die f\u00fcr RLIMIT erstellten «ucounts»-Objekte wurden weiterhin verwendet, nachdem der f\u00fcr sie reservierte Speicher freigegeben wurde (use-after-free), was es erm\u00f6glichte, seinen Code auf Kernel-Ebene auszuf\u00fchren. <\/p>\n

Die Ausnutzung der Verletzlichkeit durch einen nicht privilegierten Benutzer ist nur m\u00f6glich, wenn der unprivilegierte Zugriff auf den Benutzer-Namespaces (unprivileged user namespace) im System aktiviert ist, was standardm\u00e4\u00dfig in Ubuntu und Fedora eingeschaltet, aber in Debian und RHEL nicht aktiviert ist. Um die Verletzlichkeit zu blockieren, k\u00f6nnen Sie den unprivilegierten Zugriff auf den Benutzer-Namespace deaktivieren: sysctl -w kernel.unprivileged_userns_clone=0
\n
Quelle: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u044f\u0434\u0440\u0435 Linux \u0432 \u043a\u043e\u0434\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439 rlimit \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0430\u0445 \u0438\u043c\u0451\u043d \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 (user namespaces) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-24122), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 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