News
Vigil@nce - Qemu: integer overflow of virtio_net_handle_mac
May 2014 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can generate an integer overflow in the
virtio_net_handle_mac() function of Qemu, in order to trigger a
denial of service, and possibly to execute code.
Impacted products: Debian, RHEL, Ubuntu, Unix (platform)
Severity: 2/4
Creation date: 16/04/2014
DESCRIPTION OF THE VULNERABILITY
The hw/net/virtio-net.c de Qemu implements network features.
The virtio_net_handle_mac() function, which is reachable via
VIRTIO_NET_CTRL_MAC, processes the table of MAC (Ethernet)
addresses associated to IP multicast addresses. However, if the
number of entries in the MAC table is too large, an addition
overflows, and data are copied in a short memory area.
An attacker can therefore generate an integer overflow in the
virtio_net_handle_mac() function of Qemu, in order to trigger a
denial of service, and possibly to execute code.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Qemu-integer-overflow-of-virtio-net-handle-mac-14606
