report/security/report security check preventexecpath

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Some administration options allow setting the path to executable files on the web server such as du, aspell, ghostscript and others. This can potentially cause a security risk. You can prevent administrators from changing these paths by adding the following setting to your config.php file:
$CFG->preventexecpath = true;

You should also explicitly set the relevant paths in your config.php file such as:

$CFG->pathtodu = 'PATH';
$CFG->pathtounoconv = 'PATH'; 
$CFG->aspellpath = 'PATH';