Fetch the Flag CTF 2022 writeup: File Explorer

Snyk’s Fetch the Flag 2022 File Explorer challenge demonstrates how an outdated static-file-serving dependency can expose a directory traversal vulnerability. Participants begin by examining a public web application and its GitHub repository, then exploit URL-encoded path traversal sequences to move outside the intended `/public/` directory and access a flag file. The walkthrough shows that the vulnerability can be reproduced through Postman, curl, or a browser, while the Snyk IDE extension can identify the affected `st` package and provide vulnerability details, remediation guidance, and proof-of-concept information. The challenge highlights the security risks of unpatched third-party components, which can enable attackers to access sensitive files, credentials, or application data, and emphasizes keeping dependencies updated to reduce attack surface.

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