{"id":109268,"date":"2023-07-06T03:10:18","date_gmt":"2023-07-06T01:10:18","guid":{"rendered":"https:\/\/prohoster.info\/?p=109268"},"modified":"2023-07-06T09:41:48","modified_gmt":"2023-07-06T07:41:48","slug":"uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"La vulnerabilidad StackRot en el n\u00facleo de Linux, que permite elevar privilegios","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>La traducci\u00f3n del VMA (\u00c1rea de Memoria Virtual) en el n\u00facleo de Linux 6.1, de la estructura de datos '\u00e1rbol rojo-negro' a '\u00e1rbol de arce', dio lugar a una vulnerabilidad (CVE-2023-3269) que permite a un usuario no privilegiado ejecutar su c\u00f3digo con privilegios de n\u00facleo. La vulnerabilidad, apodada StackRot, se manifiesta a partir de la versi\u00f3n del n\u00facleo 6.1 y ha sido corregida en las actualizaciones 6.4.1, 6.3.11 y 6.1.37.     <\/p>\n<p>La estructura '\u00e1rbol de arce' es una variante del B-tree que admite la indexaci\u00f3n por rangos de valores y est\u00e1 dise\u00f1ada para un uso eficiente de la cach\u00e9 de los procesadores modernos. En comparaci\u00f3n con el '\u00e1rbol rojo-negro', el uso del '\u00e1rbol de arce' permite alcanzar un rendimiento m\u00e1s alto. La vulnerabilidad es causada por un error en el manejador de la extensi\u00f3n de la pila: en la estructura '\u00e1rbol de arce', utilizada para gestionar las \u00e1reas de memoria virtual en el n\u00facleo, el reemplazo de un nodo en el \u00e1rbol podr\u00eda llevarse a cabo sin establecer un bloqueo de escritura, lo que crea condiciones para acceder a \u00e1reas de memoria despu\u00e9s de su liberaci\u00f3n (use-after-free).       <\/p>\n<p>La explotaci\u00f3n de la vulnerabilidad se complicaba debido a que los nodos en la estructura '\u00e1rbol de arce' se liberan de manera diferida utilizando llamadas de retorno con bloqueos RCU (Read-copy-update). Sin embargo, los investigadores lograron superar las dificultades encontradas y preparar un exploit funcional que planean publicar a finales de julio, para dar a los usuarios tiempo para actualizar sus sistemas. La explotaci\u00f3n es posible en casi todas las configuraciones del n\u00facleo y solo requiere privilegios m\u00ednimos.<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=59385\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux 6.1 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 VMA (Virtual Memory Area) \u0441\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 &#171;red-black tree&#187; \u043d\u0430 &#171;maple tree&#187; \u043f\u0440\u0438\u0432\u0451\u043b \u043a \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-3269), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \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 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u044f\u0434\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f StackRot, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u044f\u0434\u0440\u0430 6.1 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 6.4.1, 6.3.11 \u0438 6.1.37. \u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 &#171;maple [&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-109268","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\" content=\"\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux 6.1 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 VMA (Virtual Memory Area) \u0441\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 &quot;red-black tree&quot; 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