# Day 21 Learning Objectives * Understand how a larger CI/CD environment operates. * Explore indirect poisoned pipeline execution (PPE) and how it can be used to exploit Git. * Apply CI/CD exploitation knowledge to the larger CI/CD environment. This room is again a very straightforward one with all commands and instructions already given. We just need to follow along and run them. ``` What Linux kernel version is the Jenkins node? [REDACTED] Make changes to 'Makefile' and after pushing, run a build. ``` ``` What value is found from /var/lib/jenkins/secret.key? [REDACTED] Make changes to 'Makefile' and after pushing, run a build. ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://bunring.gitbook.io/ctf-writeups/try-hack-me/advent-of-cyber-2023/day-21.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.