Reference https://www.vagrantup.com/docs/boxes/base.html
* A. Many publicly available Vagrant boxes are configured to allow SSH logins for the user vagrant with the password vagrant, which poses a security risk.
* B. They also typically allow SSH logins using a default, publicly available SSH key pair for the user vagrant.
* C. The vagrant user is often configured to use sudo without requiring a password, granting root privileges easily, which can be exploited if unauthorized access is gained.
References:
* Vagrant Documentation - Boxes
* Vagrant Security Model