This is a writeup about a retired HacktheBox machine: OpenAdmin created by dmw0ng and publish on January 4, 2020. This box is classified as an easy machine. The user part is longer than the root part and involve to find a vulnerable component, exploit it to get a shell, found the creds of an user able to connect using SSH then found another webservice to get the private SSH key of a second user. The root part is simply exploiting a sudo permission on nano to execute command.