Bg.zip

Create a file named cmd.php containing . Upload: Submit the file through the web interface.

Discovery often starts with identifying an upload form. In many "Zipper" style challenges, you find a PHP-based upload page that generates a download link for your compressed files. BG.zip

To gain a foothold, you can bypass filters by uploading a simple PHP script (like a webshell) inside the zip process. Create a file named cmd

Insecure handling of file uploads and the use of the zip:// wrapper, which can lead to Remote Code Execution (RCE) . Step 1: Enumeration In many "Zipper" style challenges, you find a

The server executes the command whoami , confirming Remote Code Execution. Alternative Interpretations

The server provides a path like /uploads/upload_12345.zip . Step 3: Gaining RCE

Because the server likely has an vulnerability or allows the use of PHP wrappers, you can call the file inside the archive without extracting it manually.