CVE-2023-34323

Cuando se confirma una transacción, C Xenstored primero verificará que la cuota sea correcta antes de intentar confirmar cualquier nodo. Sería posible que la contabilidad fuera temporalmente negativa si se hubiera eliminado un nodo fuera de la transacción. Desafortunadamente, algunas versiones de C Xenstored asumen que la cuota no puede ser negativa y utilizan assert() para confirmarlo. Esto provocará un bloqueo de C Xenstored cuando las herramientas se creen sin -DNDEBUG (este es el valor predeterminado).

When a transaction is committed, C Xenstored will first check the quota is correct before attempting to commit any nodes. It would be possible that accounting is temporarily negative if a node has been removed outside of the transaction. Unfortunately, some versions of C Xenstored are assuming that the quota cannot be negative and are using assert() to confirm it. This will lead to C Xenstored crash when tools are built without -DNDEBUG (this is the default).

Multiple vulnerabilities have been discovered in Xen, the worst of which could lead to privilege escalation. Versions greater than or equal to 4.17.4 are affected.