Debian: DLA-1035-1 Critical: Qemu Heap Overflow, DoS Threats

qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator and the VNC
display driver support is vulnerable to a heap buffer overflow
issue. It could occur when Vnc client attempts to update its
display after a vga operation is performed by a guest.

A privileged user/process inside guest could use this flaw to crash
the Qemu process resulting in DoS OR potentially leverage it to
execute arbitrary code on the host with privileges of the Qemu
process.

CVE-2017-7718

qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator support is
vulnerable to an out-of-bounds access issue. It could occur while
copying VGA data via bitblt functions cirrus_bitblt_rop_fwd_transp_
and/or cirrus_bitblt_rop_fwd_.

A privileged user inside guest could use this flaw to crash the
Qemu process resulting in DoS.

CVE-2017-7980

qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator support is
vulnerable to an out-of-bounds r/w access issues. It could occur