Fetch the Flag CTF 2022 writeup: Containers are ACE

A Fetch the Flag CTF walkthrough describes solving the low-difficulty “Containers are ACE” challenge by using the Snyk CLI to scan a Java container image for application vulnerabilities while excluding base-image issues. After filtering findings for critical arbitrary code or command execution flaws, the analysis identifies Apache Struts vulnerability CVE-2017-5638, which has a maximum CVSS score and publicly available exploit techniques. Using Burp Suite, the solver intercepts a login request, modifies it with a known payload, and confirms command execution from the application’s response. File enumeration and content searching then locate the CTF flag, illustrating a process of reconnaissance, vulnerability triage, request manipulation, and post-exploitation discovery.

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