CVE-2020-11869

Se encontró un desbordamiento de enteros en QEMU versiones 4.0.1 hasta 4.2.0, en la manera en que implementó la emulación ATI VGA. Este error se produce en la rutina ati_2d_blt() en el archivo hw/display/ati-2d.c mientras se manejan operaciones de escritura MMIO por medio de la devolución de llamada de ati_mm_write(). Un invitado malicioso podría abusar de este fallo para bloquear el proceso QEMU, resultando en una denegación de servicio.

It was discovered that QEMU incorrectly handled bochs-display devices. A local attacker in a guest could use this to cause a denial of service or possibly execute arbitrary code in the host. This issue only affected Ubuntu 19.10. It was discovered that QEMU incorrectly handled memory during certain VNC operations. A remote attacker could possibly use this issue to cause QEMU to consume resources, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10. Various other issues were also addressed.