Example of shell exploit

1. Build java:

mvn package

2. Build container

docker build -t tomcat-example .

3. Run:

docker run -d -p 8080:8080 tomcat-example

4. Run python attack:

python exploit.py

Done!

Shell should be available at: http://localhost:8080/shell.jsp?cmd=id

Run with workaround

Enables the controller advice specified in BinderControllerAdvice

docker run -e "SPRING_PROFILES_ACTIVE=fix" -d -p 8080:8080 tomcat-example`

If you now run the exploit python exploit.py it will not create the file shell.js.
Please beware that this is not a complete workaround until the actual issue is fixed.