CVE-2017-5987

La función sdhci_sdma_transfer_multi_blocks en hw/sd/sdhci.c en QEMU (también conocida como Quick Emulator) permiten a usuarios privilegiados invitados locales OS provocar una denegación de servicio (bucle infinito y caída del proceso QEMU) a través de vectores que implican el registro de modo de transferencia durante la transferencia de múltiples bloques.

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.