Please remember that VulnHub is a free community resource so we are unable to check the machines that are provided to us. Before you download, please read our FAQs sections dealing with the dangers of running unknown VMs and our suggestions for "protecting yourself and your network. If you understand the risks, please download!
Oz was originally created and submitted to HackTheBox. It is a medium/hard boot2root challenge. The Oz box has 2 flags to find (user and root) and has a direct route for each, no need to bruteforce access. It is a slightly trolly box with real world vulnerabilities. The OVF has been tested on VirtualBox, VMware Fusion, and VMware Workstation.
If you have questions or concerns we can be contacted via Twitter - @incidrthreat and @ilove2pwn_