Description
It was found that libvirt did not set the user-defined backing store format
when creating a new image, possibly resulting in applications having to
probe the backing store to discover the format. A privileged guest user
could use this flaw to read arbitrary files on the host. (CVE-2010-2239)
It was found that libvirt created insecure iptables rules on the host when
a guest system was configured for IP masquerading, allowing the guest to
use privileged ports on the host when accessing network resources. A
privileged guest user could use this flaw to access network resources that
would otherwise not be accessible to the guest. (CVE-2010-2242)