{"id":87102,"date":"2020-07-03T19:42:01","date_gmt":"2020-07-03T17:42:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-ubuntu-20-10-budet-ogranichen-dostup-k-dmesg"},"modified":"2020-07-03T19:42:01","modified_gmt":"2020-07-03T17:42:01","slug":"v-ubuntu-20-10-budet-ogranichen-dostup-k-dmesg","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/v-ubuntu-20-10-budet-ogranichen-dostup-k-dmesg","title":{"rendered":"En Ubuntu 20.10 se limitar\u00e1 el acceso a dmesg","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Desarrolladores de Ubuntu <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.ubuntu.com\/archives\/ubuntu-devel\/2020-July\/041079.html\">se acord\u00f3<\/a><\/noindex> la restricci\u00f3n de acceso a la utilidad \/usr\/bin\/dmesg es solo para los usuarios que pertenecen al grupo \u00abadm\u00bb. Actualmente, los usuarios no privilegiados de Ubuntu no tienen acceso a \/var\/log\/kern.log, \/var\/log\/syslog y a los eventos del sistema en journalctl, pero pueden ver el registro de eventos del n\u00facleo a trav\u00e9s de dmesg.<\/p>\n<p>Como raz\u00f3n se menciona la presencia de informaci\u00f3n en la salida de dmesg que puede ser utilizada por atacantes para facilitar la creaci\u00f3n de exploits para elevar privilegios. Por ejemplo, en dmesg, en caso de fallos, se muestra un volcado de la pila y hay posibilidad de determinar las direcciones de las estructuras en el n\u00facleo, lo que puede ayudar a eludir el mecanismo KASLR. Un atacante puede usar dmesg como retroalimentaci\u00f3n, ajustando gradualmente el exploit al observar los mensajes de oops en el registro despu\u00e9s de intentos fallidos de ataque.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fuente: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53280\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 Ubuntu \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043b\u0438 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0443\u0442\u0438\u043b\u0438\u0442\u0435 \/usr\/bin\/dmesg \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u043b\u044f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0445 \u0432 \u0433\u0440\u0443\u043f\u043f\u0443 &#171;adm&#187;. \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0438 Ubuntu \u043d\u0435 \u0438\u043c\u0435\u044e\u0442 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \/var\/log\/kern.log, \/var\/log\/syslog \u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u043c \u0441\u043e\u0431\u044b\u0442\u0438\u044f\u043c \u0432 journalctl, \u043d\u043e \u043c\u043e\u0433\u0443\u0442 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043b\u043e\u0433 \u0441\u043e\u0431\u044b\u0442\u0438\u0439 \u044f\u0434\u0440\u0430 \u0447\u0435\u0440\u0435\u0437 dmesg. \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043f\u0440\u0438\u0447\u0438\u043d\u044b \u0443\u043f\u043e\u043c\u0438\u043d\u0430\u0435\u0442\u0441\u044f \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u0432 \u0432\u044b\u0432\u043e\u0434\u0435 dmesg \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u044b \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u043c\u0438 \u0434\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-87102","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" 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