Command Injection

Command Injection

Command Injection | OWASP Foundationowasp.org

PHP Command Injection

The following PHP code snippet is vulnerable to a command injection attack:

<?php
print("Please specify the name of the file to delete");
print("<p>");
$file=$_GET['filename'];
system("rm $file");
?>

The following request is an example of that will successful attack on the previous PHP code, and will output the results of the id command: http://127.0.0.1/delete.php?filename=bob.txt;id. Look for exposed $_GET['filename'] type variables that take input from the user, or can be injected into from the URL. This combined with system("<command>") will allow for command injection.