Htb Writeup Upd Verified - Pdfy

Since the application blocks direct file:// or localhost inputs, the standard bypass is to host a malicious script on your own server. This script will redirect the wkhtmltopdf engine to the local file you want to read.

Upon launching the challenge, you are greeted with a simple web interface that prompts for a URL. The application’s stated purpose is to "turn your favorite web pages into portable PDF documents". pdfy htb writeup upd

If using wkhtmltopdf in production, ensure it is updated and configured with --disable-local-file-access to prevent this exact type of leak. Since the application blocks direct file:// or localhost

Leak the contents of /etc/passwd to retrieve the hidden flag. Primary Vulnerability: SSRF via the wkhtmltopdf tool. 1. Initial Enumeration The application’s stated purpose is to "turn your

Your server responds with a 302 Redirect to file:///etc/passwd .

By inspecting the metadata of the generated PDF files (using tools like exiftool or by looking at the PDF's properties), you can identify the backend engine: .