The virDomainGetXMLDesc API in Libvirt before 1.2.11 allows remote read-only users to obtain the VNC password by using the VIRDOMAINXMLMIGRATABLE flag, which triggers the use of the VIRDOMAINXMLSECURE flag.
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libvirt-bin",
"binary_version": "1.2.2-0ubuntu13.1.7"
},
{
"binary_name": "libvirt-dev",
"binary_version": "1.2.2-0ubuntu13.1.7"
},
{
"binary_name": "libvirt0",
"binary_version": "1.2.2-0ubuntu13.1.7"
}
]
}