CVE-2017-5578

Pérdida de memoria en la función virtio_gpu_resource_attach_backing en hw/display/virtio-gpu.c en QEMU (también conocido como Quick Emulator) permite a usuarios locales de SO invitado provocar una denegación de servicio (consumo de memoria del host) a través de un gran número de comandos VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING.

Zhenhao Hong discovered that QEMU incorrectly handled the Virtio GPU device. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. It was discovered that QEMU incorrectly handled the JAZZ RC4030 device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. Jann Horn discovered that QEMU incorrectly handled VirtFS directory sharing. A privileged attacker inside the guest could use this issue to access files on the host file system outside of the shared directory and possibly escalate their privileges. In the default installation, when QEMU is used with libvirt, attackers would be isolated by the libvirt AppArmor profile. Various other issues were also addressed.