Burrow position: special upload tips, bypassing the PHP picture Converter to achieve remote code execution RCE-a vulnerability warning-the black bar safety net

I use a special image upload tips, bypassing the PHP GD library for image conversion processing, and ultimately successfully achieve remote code execution. The way it is. I was testing the site on whether there is asql injectionvulnerabilities, inadvertently I'm on the site personal page found a...