In der Implementierung der asynchronen Eingabe\/Ausgabe-Schnittstelle io_uring, die seit der Version 5.1 Teil des Linux-Kernels ist, wurde eine Sicherheitsanf\u00e4lligkeit (CVE-2022-29582) entdeckt, die es unprivilegierten Benutzern erlaubt, Root-Rechte im System zu erlangen, einschlie\u00dflich der Ausf\u00fchrung eines Exploits aus einem Container. Die Sicherheitsanf\u00e4lligkeit entsteht durch den Zugriff auf einen bereits freigegebenen Speicherblock und tritt in Linux-Kernels ab Version 5.10 auf; sie wurde im April in den Updates 5.10.111, 5.15.34 und 5.17.3 behoben. <\/p>\n
Der Zugriff auf freigegebenen Speicher erfolgt als Ergebnis eines Rennzustands bei der Verarbeitung von Zeit\u00fcberschreitungen in der Funktion io_flush_timeouts(), die den Eintrag \u00fcber die Zeit\u00fcberschreitung aus der Liste entfernt und annulliert, ohne zu \u00fcberpr\u00fcfen, ob die Zeit\u00fcberschreitung zu diesem Zeitpunkt erstellt oder gel\u00f6scht wurde. <\/p>\n
Forscher haben einen funktionierenden Exploit entwickelt, der keine Aktivierung von Benutzer-Namensr\u00e4umen (user namespaces) f\u00fcr seine Ausf\u00fchrung ben\u00f6tigt und Root-Zugriff im Hauptsystem bieten kann, wenn der Exploit von einem unprivilegierten Benutzer in einem isolierten Container ausgef\u00fchrt wird. Der Exploit funktioniert unter anderem in der isolierten Umgebung nsjail in der Google COS (Container Optimized OS), die auf Chromium OS basiert und auf der Google Cloud Platform in Compute Engine verwendet wird. Der Exploit ist f\u00fcr den Einsatz mit Kernels der Versionen 5.10 bis 5.12 ausgelegt. virtuellen Maschinen<\/a> Die Ver\u00f6ffentlichung von NetBSD 9.3. \u0412 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 io_uring, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0433\u043e \u0432 \u044f\u0434\u0440\u043e Linux \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 5.1, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-29582), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u043f\u0440\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 \u0438\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435\u043c \u043a \u0443\u0436\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u043e\u043c\u0443 \u0431\u043b\u043e\u043a\u0443 \u043f\u0430\u043c\u044f\u0442\u0438, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u044f\u0434\u0440\u0430\u0445 Linux \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0442\u043a\u0438 5.10 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0430\u043f\u0440\u0435\u043b\u0435 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 […]<\/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-104786","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\udd47Sicherheitsanf\u00e4lligkeit im io_uring-Subsystem des Linux-Kernels, die es erm\u00f6glicht, Root-Rechte aus einem Container zu erlangen | ProHoster","description":"\ud83e\udd47Sicherheitsanf\u00e4lligkeit im io_uring-Subsystem des Linux-Kernels, 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Quelle: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"