Hemisphere:Gemini - Walkthrough [Vulnhub]

Here's my solution for Hemisphere:Gemini.
The machine can be downloaded from here.

Service Discovery
Using Nmap for scanning all TCP ports.
$ nmap -sC -sV -p- 192.168.1.132


We find 5 ports open.

Enumeration
Browsing the web.


Using gobuster to scan directories.
$ gobuster dir -w /usr/share/wordlists/usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -u http://192.168.1.132/ -t 100 -x php,txt,html


Browsing /Portal


We click on CONTACTO, we find that the view= parameter is vulnerable to LFI.





By looking at the contents we find a user- william.
By exploting the LFI we try to get the william's ssh key.





We copy the ssh key to a file.

Initial Access
Before accessing ssh. We change the permission of the key file.
$ chmod 600 key
$ ssh -i key william@192.168.1.132


User Flag.


Privilege Escalation
Checking the permissions on /etc/passwd file, shows that we have full privileges.



Lets change the root user password.

On our machine we create the password as- pass



On target machine we change the password for user- root by editing the /etc/passwd file.


 


Lets view the changes.


Lets switch to root and grab the root flag.


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