Pdfy Htb Writeup Upd Review
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".
However, because the PDFy interface only takes a URL rather than raw HTML input, we cannot type an tag directly into the input bar. The target server must query an external URL that we control. 3. The Exploitation Strategy: Redirection Bypass pdfy htb writeup upd
The SSRF vulnerability in wkhtmltopdf can be triggered by inserting an iframe that points to an internal asset’s IP address or a local file, causing the tool to fetch the embedded resource. Upon launching the challenge, you are greeted with
<!DOCTYPE html> <html> <body> <object data="file:///etc/passwd" width="100%" height="800px"></object> </body> </html> The target server must query an external URL that we control
Inspecting the metadata or causing a rendering error exposes the underlying technology used to build the PDFs: . Phase 2: Vulnerability Analysis (The SSRF Pivot)
To bypass the frontend filters, you can use a technique. Instead of pointing the tool directly to a local file, you point it to a server you control (a VPS or a local server exposed via a tool like Serveo ).
Enter the URL of your hosted exploit.php (e.g., http://your-ip:port/exploit.php ) into the PDFy input field.
