Legacy is a relatively easy box which has SMB running on Windows XP(2000) OS. We find the exploit with metasploit and get access to priviledged user NT AUTHORITY\SYSTEM directly.
Lame is the 1st box on HackTheBox which requires only one exploit in Samba to obtain root access. We also explore other ways during we reach to superuser’s shell.
Horizontall is a fun box which has an API, vulnerable to Improper Access Control and RCE. The box is running a laravel service which is vulnerable to RCE which lets us run commanad as root.
Previse is a fun Linux box on HackTheBox that has insecure redirect implementation which leaks information on the page. This can then be used to create a new user in the application and get access to backup.zip of it. Backup revels that there is a command injection vulnerability present in the logs fetching feature, which gets us a basic shell. We have a MySQL server running inside the box which has reused credenrials from the backup.zip. We get hashed/salted credentials inside this database and crack it by writing a custom PHP script. We again have a username and password reuse for a SSH user, which gives us a user shell. Listing sudo privilegs we get to know there is a script which we can run as root, that does not mention absolute $PATH for a command being used. Thus can be overriden by $PATH variable set by current USER.
BountyHunter is a fun Linux box on HackTheBox that has XXE injection on a PHP form, which exposes DB credentials. This DB credential is reused as a password for a user on the box. The box also has an internal python3 script which could be run as elevated privileges. This script uses eval by which we get command injection, which leads to superuser access to this box.