Pdfy - Htb Writeup Upd [hot]

The app will visit your server, get hit with the Location: file:///etc/passwd header, and proceed to render the target machine's local /etc/passwd file into a PDF.

By examining the metadata of the generated PDF or observing error messages, the backend is identified as using wkhtmltopdf Test for SSRF: Entering a basic URL like pdfy htb writeup upd

The tool uses wkhtmltopdf to perform the conversion. The app will visit your server, get hit

The first breakthrough came from testing the boundaries of that URL input. By pointing the tool toward a local loopback address, the researcher confirmed a Server-Side Request Forgery (SSRF) vulnerability. The server wasn't just fetching public websites; it was willing to talk to itself. : Lack of input validation on the submitted URL. By pointing the tool toward a local loopback

Traditional injections (like HTML tags) might not directly validate, but the server must query the provided URL to render it.