I'm working on an AWS Ubuntu Server protected by the WAF Shield and I'm seeing a strange (at least I think) behaviour.
When an image is uploaded to my system, some of them are being denied some not. All the images are validated and the upload of some of them returns an error 403 (Forbidden). If I open the same image in any image editor and just save it as a new file (of the same type etc..), this second file is uploaded normally.
This doesn't have a pattern of size, type or any detail of the image. The best guess that we have is the EXIF present (or not) inside the image.
Did anyone had problems like this?