8/13/2023 0 Comments Compress image phpTo do so, two lines have been added to the image handling function. Before storing the files uploaded by a user, the application will use the PHP-GD function imagepng to compress all images uploaded to the web server. The /second-part route illustrates a slightly more realistic – and difficult – scenario for an attacker. Images are resized, compressed or encoded into specific file formats using some standard PHP libraries like PHP-GD. Most of the time however, image files are not stored as-is on the server, as w as assumed in the first part of the article. It will then be executed by the server in the same way as for the first method shown above. Since the file is uploaded to the web server as-is, without any further processing, the trailing PHP payload will remain in the file. One could simply add PHP code after the data of the original PNG file: $ echo '' > nasa.png
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