Earlier quoted context omitted.
like this? http://freebsd.1045724.n5.nabble.com/Thoughts-on-jail-privil...
That's dated Jan 15, 2009. Are there any newer exploits for breaking out of jails on recent versions of FreeBSD? OR breaking out of a Bhyve VM?
And that's not even an exploit, that's the sysadmin doing it wrong:
"If the host system and the jail share the `john' user and you are
sharing `/usr/local' as read-write between the host and the jail, then
``you are doing it wrong!''."