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Chamilo LMS File Upload (CVE-2021-31933)
cve-2021 | Level: Easy | Total Lab Runs: 0 | Premium Lab |
What is Chamilo LMS?
Chamilo is a learning management system focused on ease of use and accessibility.
What is CVE-2021-31933?
A remote code execution vulnerability exists in Chamilo through 1.11.14 due to improper input sanitization of a parameter used for file uploads, and improper file-extension filtering for certain filenames (e.g., .phar or .pht). A remote authenticated administrator is able to upload a file containing arbitrary PHP code into specific directories via main/inc/lib/fileUpload.lib.php directory traversal to achieve PHP code execution.
In this lab environment, the user is going to get access to a Kali GUI instance. A Chamilo LMS instance vulnerable to remote code execution, identified by CVE-2021-31933, is running on the target server. It can be accessed using the tools installed on Kali at http://demo.ine.local/chamilo-lms.
Objective: Exploit the remote code execution vulnerability in Chamilo LMS 1.11.14 to gain shell access on the target server and retrieve the flag.
The following credentials might be useful:
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
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