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BigTree RCE (CVE-2020-26670)

cve-2020 | Level: Easy  | Total Lab Runs: 0 | Premium Lab

Lab Scoreboard

What is BigTree? 

BigTree is an extremely extensible open-source CMS built on PHP and MySQL. It was created by expert designers, strategists, and developers at Fastspot to help you make and maintain better websites. It has more flexibility, the developer forum is robust and the programmer/designer enjoys the proactive approach that BigTree offers.

What is CVE-2020-26670? 

BigTree CMS v4.4.10 and below are vulnerable to containing an OS Command Injection vulnerability via the 'Create a New Setting' function.


Lab Environment 

In this lab environment, the user will get access to a Kali GUI instance. A BigTree CMS instance vulnerable to OS command identified by CVE-2020-26670 is running on the target server. It can be accessed using the tools installed on Kali at http://demo.ine.local. 

Objective: Leverage the vulnerable BigTree instance to exploit this vulnerability as an authenticated user and execute a command/code on the target server. 

The following credentials might be helpful: 


Password: password 


  • This lab is dedicated to you! No other users are on this network :) 

  • Once you start the lab, you will have access to a root terminal of a Kali instance

  • Your Kali has an interface with IP address 192.X.Y.2. Run "ip addr" to know the values of X and Y.

  • The target application should be accessible at http://demo.ine.local/chamilo-lms

  • Do not attack the gateway located at IP address 192.X.Y.1

The following activities are strictly prohibited on this website unless otherwise explicitly stated as allowed in the mission statement:

  • Using automated scanners
  • Using brute force attacks
  • Denial of Service attacks
  • Attacking other student machines in challenges where you might achieve a shell on the vulnerable system
  • Attacking the lab infrastructure

Users violating the above will be either temporarily or permanently banned from the website. 

If you are unsure about an activity, then please contact support to confirm that it is allowed on our website.

Technical Support for this Lab:

There is a reason we provide unlimited lab time: you can take as much time as you need to solve a lab. However, we realize that sometimes hints might be necessary to keep you motivated!

We currently provide technical support limited to:

  • Giving hints for a lab exercise
  • In rare circumstances, if you have totally given up (NO!!!) then tell you how to solve it. This will be limited to sharing the solution video or lab report
  • A lab exercise fails to load or has errors in it

If you need technical support, please email  clearly mention the name and link of the lab exercise and other essential details. The more descriptive you are, the faster we can help you. We will get back to you within 24 hours or less. 

For adminitrative queries, billing, enterprise accounts etc. please email