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SYNTHESIS OF THE VULNERABILITY

An attacker, privileged inside a guest system, can generate a
memory corruption via vmsvga_fifo_run() of QEMU, in order to
trigger a denial of service, and possibly to run code on the host
system.

Impacted products: Debian, Fedora, QEMU.

Severity: 2/4.

Creation date: 09/09/2016.

DESCRIPTION OF THE VULNERABILITY

The QEMU product can emulate the VMware-SVGA chipset.

The DEFINE_CURSOR command defines the cursor. However, the
vmsvga_fifo_run() function does not correctly check offsets, which
corrupts the memory.

An attacker, privileged inside a guest system, can therefore
generate a memory corruption via vmsvga_fifo_run() of QEMU, in
order to trigger a denial of service, and possibly to run code on
the host system.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/QEMU-memory-corruption-via-vmsvga-fifo-run-20564