Due to the OSX limitations in ports below 1024, in order to use them without running as root the virtualbox headless you can do the following workaround, (remember the command ipfw is deprecated on El Capitan)
In the Vagrant file use ports over 1024, for instance change 80 and 443 to 8080 and 8043.
# Apache
config.vm.network "forwarded_port", guest: 80, host: 8080