OpenAdmin
Gaining Access
Nmap scan:
Port 80
We can run a gobuster scan on port 80:
I visited the /music directory first and it brought me to some corporate website:
When I clicked login, it brought me to /ona, which was a dashboard for OpenNetAdmin:
This version of OpenNetAdmin was vulnerable to RCE:
We can gain a shell by following the PoC:
Privilege Escalation
Jimmy Credentials
The users present on the machine are joanna and jimmy, and it seems that ssh with this password works on jimmy:
Joanna SSH Key
When looking around the /var/www/internal directory, we can some code referencing the private SSH key of joanna:
When reading further, we can find the password and username hard-coded into the application:
The hash can be cracked to give Revealed. We can read /etc/apache2/sites-available/internal.conf to find the hidden sub-domain and port it is open on:
After port forwarding via ssh -L 52846:127.0.0.1:52846 jimmy@10.10.10.71, we can access the login page:
Logging in reveals a password protected RSA Private Key:
We can decrypt this via ssh2john:
Afterwards, we can use openssl rsa -in key -out privatekey to write the private RSA key, then ssh in as joanna:
Nano GTFOBins
When checking sudo privileges, joanna can run nano as root:
Based on GTFOBins, we can simply run the following commands to gain a shell:
Rooted!
