Spring4Shell-POC – Dockerized Spring4Shell (CVE-2022-22965) PoC Application And Exploit
This is a dockerized application that is vulnerable to the Spring4Shell vulnerability (CVE-2022-22965). Full Java source for the war is provided and modifiable, the war will get re-built whenever the docker image is built. The built WAR will then be loaded by Tomcat. There is nothing special about this application, it's a simple hello world that's based off Spring tutorials.
Details: https://www.lunasec.io/docs/blog/spring-rce-vulnerabilities
Having issues with the POC? Check out the LunaSec fork at: https://github.com/lunasec-io/Spring4Shell-POC, it's more actively maintained.
Requirements
- Docker
- Python3 + requests library
Instructions
- Clone the repository
- Build and run the container:
docker build . -t spring4shell && docker run -p 8080:8080 spring4shell - App should now be available at http://localhost:8080/helloworld/greeting
- Run the exploit.py script:
python exploit.py --url "http://localhost:8080/helloworld/greeting"
- Visit the created webshell! Modify the
cmdGET parameter for your commands. (http://localhost:8080/shell.jspby default)
Notes
Fixed! As of this writing, the container (possibly just Tomcat) must be restarted between exploitations. I'm actively trying to resolve this.
Re-running the exploit will create an extra artifact file of {old_filename}_.jsp.
PRs/DMs @Rezn0k are welcome for improvements!
Credits
- @esheavyind for help on building a PoC. Check out their writeup at: https://gist.github.com/esell/c9731a7e2c5404af7716a6810dc33e1a
- @LunaSecIO for improving the documentation and exploit
- @rwincey for making the exploit replayable without requiring a Tomcat restart
