Python Scripting for Blind SSRF and Out-of-Band Data Exfiltration via XXE

In this video tutorial, we delve into the world of advanced web security techniques and explore the concept of Blind Server-Side Request Forgery (SSRF) attacks combined with XML External Entity (XXE) Injection. By harnessing the power of Python, we demonstrate how these techniques can be used to exfiltrate data out-of-band.
The video takes you through the Python script step by step, explaining each component and its role in the attack. We start by parsing a post.req file to extract the necessary information, including headers, body content, and the target URL. We ensure that the post.req file contains the required Host header to proceed.
Next, we set up a local web server to host a specially crafted DTD (Document Type Definition) file. This file allows us to define custom entities and exploit the XXE vulnerability. We demonstrate how to update the DTD file dynamically based on user input.
Once the server is running, we prompt the user for substitution values to be injected into the XXE payload. These values are then used to construct the malicious DTD file, which includes a base64-encoded data exfiltration mechanism.
With everything in place, we send a POST request to the target URL, leveraging the Blind SSRF vulnerability. As the server processes the request and attempts to parse the XML, our XXE payload triggers the exfiltration of data out-of-band. We showcase how the decoded data is captured and displayed.
Throughout the video, we emphasize the importance of ethical hacking and responsible disclosure. We encourage viewers to use this knowledge to improve web application security and raise awareness among developers and organizations about the risks associated with SSRF and XXE vulnerabilities.
Join us in this exciting exploration of Python, Blind SSRF, and XXE Injection, and gain a deeper understanding of these advanced web security techniques. Don’t miss out on this opportunity to expand your hacking skills while also promoting a safer online environment.
Write up of the machine “Pollution”, Rating “Hard” is available on the below telegram group.

Python script – https://github.com/Quadrupl3d/XXE/blob/main/XXE-exfiltrator.py
Telegram – https://t.me/+nrmQkJaWdSdjMGI1
Happy hunting !