Pdfy Htb Writeup Upd

If you attempt a direct SSRF by inputting http://127.0.0.1 or file:///etc/passwd , the web application returns an error. This indicates that the backend employs a strict filtering mechanism or regex validation check on incoming input to prevent blatant attacks. Fingerprinting the PDF Engine

This method uses a simple HTML page hosted on your own machine to redirect wkhtmltopdf to the target local file.

sudo /usr/bin/pdftex --shell-escape

Are you getting an when trying to inject a payload? Do you need help setting up a netcat listener ?

While the frontend validator blocks you from typing a file:// scheme directly into the text field, it only evaluates the URL. It does not validate subsequent locations if the target server issues an HTTP redirection status code (like 302 Found ). pdfy htb writeup upd

The HTTP service running on port 8080 appears to be a REST API for managing PDFs.

The generated PDF will contain the contents of /etc/passwd , where the flag is appended. Download or view the PDF to obtain the flag. If you attempt a direct SSRF by inputting http://127

The exploitation phase involves using the information gathered during enumeration to gain access to the system.

Take note of the public URL (e.g., https://abc123.ngrok.io ). sudo /usr/bin/pdftex --shell-escape Are you getting an when