The following works for OCUM 7.3 to get the root password for the OCUM VM appliance. I feel confident that Support won't appreciate you doing this on a production system, so YMMV, and all that.
You will need a Linux VM on the same ESX host that is running the OCUM appliance.
1) Shut down your OCUM VM and your Linux VM
2) Add the first virtual disk of your OCUM VM to the Linux VM (Incidentally, the first disk is the boot disk, the second disk is swap, the third disk is an LVM group for the database, and the fourth disk seems like a bare-bones rescue boot disk or something)
3) Boot your Linux VM off of its own boot disk.
4) Mount the OCUM disk (e.g. mkdir /ocum_disk ; mount /dev/sdb1 /ocum_disk)
5) Change root directories: chroot /ocum_disk
6) Unlock the root user: usermod -U root
7) Set root's password to whatever you want: passwd root
😎 Exit the chroot jail with CTRL-D or 'exit'
9) Unmount the OCUM volume: umount /ocum_disk
10) Shutdown the Linux VM: shutdown -h now
11) Remove the OCUM disk from the Linux VM configuration
12) Boot OCUM and login on the console as root with your new password.
Note that the SSHD configuration has root login disabled, so you won't be able to SSH as root into the OCUM server, but logging into the console is no problem.
It seems like the OCUM VM should ship with root enabled, because there are certain reasons (like some WFA Packs) that require adding/modifying files on the OCUM server.