Installed patched build onto Maverick server. vnc_listen set to 0.0.0.0
in /etc/libvirt/qemu.conf

Set vnc_password=""' with vnc_tls=1 in /etc/libvirt/qemu.conf and
confirmed that the lanched server now rejects authentication for any
password, whereas it turned off authentication and encryption completely
before.

Hashed out vnc_password and left vnc_tls=1 in /etc/libvirt/qemu.conf.
Confirmed that the server uses anonymous auth with TLS. Allows the user
on without a password. qemu-kvm launched with -vnc
0.0.0.0:0,tls,x509=/etc/pki/libvirt-vnc

Hashed out vnc_tls=1. Confirmed server allows direct access to VNC.
qemu-kvm launched with -vnc 0.0.0.0:0

Set vnc_password="". Confirmed server rejects authentication for any
password, with no encryption. Again previously it had just let the user
on. qemu-kvm launched with -vnc 0.0.0.0:0,password

set vnc_password="password". Confirmed server accepts authentication
with that password. qemu-kvm launched with -vnc 0.0.0.0:0,password

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https://bugs.launchpad.net/bugs/697197

Title:
  Empty password allows access to VNC in libvirt

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