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In the Ocaml xenstored implementation, the internal representation of the tree has special cases for the root node, because this node has no parent. Unfortunately, permissions were not checked for certain operations on the root node. Unprivileged guests can get and modify permissions, list, and delete the root node. (Deleting the whole xenstore tree is a host-wide denial of service.) Achieving xenstore write access is also possible. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable."}, {"lang": "es", "value": "Se detect\u00f3 un problema en Xen versiones hasta 4.14.x. En la implementaci\u00f3n de Ocaml xenstored, la representaci\u00f3n interna del \u00e1rbol tiene casos especiales para el nodo root, porque este nodo no tiene padre. Desafortunadamente, no fueron comprobados los permisos para determinadas operaciones en el nodo root. Los invitados no privilegiados pueden obtener y modificar permisos, enumerar y eliminar el nodo root. (Eliminar todo el \u00e1rbol de xenstore es una denegaci\u00f3n de servicio en todo el host). 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