Spring4Shell - PoC

CVE - 2022 - 22965

Versions affected :

• Spring Framework versions 5.3.0 to 5.3.17, 5.2.0 to 5.2.19 and older versions
• Java JDK 9
• Apache Tomcat versions below 10..0.20, 9.0.62, and 8.5.78
• Applications that are packaged as a traditional WAR with spring-webmvc or spring-webflux dependency and deployed on a standalone Servlet container alone are affected

Description

• The issue can be elevated by classLoader manipulation
• Improper data binding that is used to populate an object from request parameters (Request Mapping annotation) causes this vulnerability
• Attackers can load arbitrary classes and can inject arbitrary code that can be executed by the application
• A similar vulnerability (CVE-2010-1622) had been disclosed earlier and patches have been applied to restrict class.classLoader and class.protectionDomain
• But JDK9 introduced a new method class.getMethod(), which bypasses that restriction by using class.module.classLoader to access any child property of class object

Impact

• Successful exploitation of this vulnerability can lead to arbitrary code execution on the vulnerable machine.

Test Application

• gokul-ramesh/Spring4Shell-POC (forked from lunasec-io/Spring4Shell-POC )
• Clone the repository and build the application

docker build . -t spring4shell-poc-app

Else get the docker image from [gokul2/spring4shell-poc]

docker pull gokul2/spring4shell-poc-app

• Bring up the application

docker run -p 8080:8080 spring4shell-poc-app

• The application will be available at localhost:8080 now.
• Run the exploit.py file