IMPORTANT:AttackDefense Labs is included with a Pentester Academy subscription! Upgrade Now to access over 1800+ Labs.
Already a Pentester Academy student? Your access will continue uninterrupted. Please use the same Google account to login here.
Not a Pentester Academy student? Try our Free Communitiy Labs
GeoServer Host Header Injection to SSRF (CVE-2021-40822)
cve-2021 | Level: Easy | Total Lab Runs: 0 | Premium Lab |
What is GeoServer?
GeoServer is an open source software server written in Java that allows users to share and edit geospatial data. Designed for interoperability, it publishes data from any major spatial data source using open standards.
CVE-2021-40822: Geoserver SSRF
In 2021, a researcher by the alias @phor3nsic_br discovered an SSRF vulnerability in Geoserver. It was assigned CVE ID CVE-2021-40822.
As stated on the NVD page for CVE-2021-40822:
GeoServer through 2.18.5 and 2.19.x through 2.19.2 allows SSRF via the option for setting a proxy host.
The base score assigned to this vulnerability was 7.5 (HIGH).
In this lab, we will learn how to leverage the Host Header Injection to perform an SSRF attack in the GeoServer application (CVE-2021-40822) and interact with an internal web server running on the target server.
In this lab environment, the user is going to get access to a Kali GUI instance. A vulnerable instance of the GeoServer application is hosted on the target server. It can be accessed using the tools installed on Kali at http://demo.ine.local:8080/geoserver.
Objective: Leverage the SSRF vulnerability in the GeoServer application to interact with the internal HTTP server running on port 8000 and retrieve the flag.
The setup is based on the following GitHub repository: https://github.com/phor3nsic/CVE-2021-40822
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 GeoServer application should be accessible on http://demo.ine.local:8000/geoserver
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 email@example.com 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 firstname.lastname@example.org