CVE-2023-XXX83

In this lab, you will be reviewing a piece of Java code that implements the DOM-based abstract SignatureMethod for RSA-PSS. The code comes with a patch file that addresses a specific vulnerability. Your task is to first go through the code and try to identify the security issue on your own. Once you have made your assessment, you can then look at the patch to see if your findings align with the implemented fix. This exercise is designed to improve your code review skills and your ability to spot security flaws.

The lab focuses on the class DOMRSAPSSSignatureMethod within the Apache JCP XML Digital Signature library. The patch includes several modifications such as proper implementation of method overrides, reorganization of imports, and improved logging for better debugging and security. By working through this lab, you will gain practical experience in identifying and understanding common vulnerabilities in cryptographic implementations.