Description of the vulnerability: https://www.cyberkendra.com/2022/03/springshell-rce-0-day-vulnerability.html

Construction of the POC: https://github.com/BobTheShoplifter/Spring4Shell-POC

Steps to Build/Run

Tested with JDK 11.0.14, Spring Boot 2.6.5, and Apache Tomcat 9.0.60

• Run mvn clean package to build the application
• Rename demo-0.0.1-SNAPSHOT.war to spring-poc.war and copy this .war file to Tomcat's webapps directory
• Run python exp.py --url http://localhost:8080/spring-poc/greeting