CVE-2017-7377

Las funciones de (1) v9fs_create y (2) v9fs_lcreate en hw/9pfs/9p.c en QEMU (también conocido como Quick Emulator) permiten a los usuarios privilegiados de usuarios locales huésped causar una denegación de servicio (descriptor de archivo o consumo de memoria) a través de vectores relacionados con un fid ya en uso.

Li Qiang discovered that QEMU incorrectly handled VirtFS directory sharing. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. Jiangxin discovered that QEMU incorrectly handled the Cirrus VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. Li Qiang and Jiangxin discovered that QEMU incorrectly handled the Cirrus VGA device when being used with a VNC connection. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code on the host. 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.