The Index.php Module

[Necuima 18]

Hi Larry,

 

I recently came across an attempted hack via the index.php module (pages 57...).

 

I checked the logs and they added additional stuff to the $_GET['p'] data.

 

In case it is of interest, I think the code I have added should avoid that in the future:

 

if (isset($_GET['p']))
	{
     	$p = $_GET['p'];
	// if there's any characters in there that shouldn't be, exit
	if (!preg_match("/^[a-z\_]/", $p))
	        {	
			exit ("Invalid attempt to access this module");
		}
	}
else
    $p = NULL;

Can you suggest a better way?

 

Thanks, and Cheers

[Necuima 18]

That regex should be /^[a-z\_]+$/

 

Oops

[Larry 426]

That sounds good, however, I'm not sure it's necessary. The code as written, I believe, checks against static values and serves a default value if there's no match. So it doesn't matter what a user provides that doesn't match. 

 

But if you want to use the regex, that's fine, too, just make sure you keep it up to date as you add or change modules. (Or make sure your modules always fit within that definition.)

[Necuima 18]

Thanks for your thoughts, Larry.

 

They are always appreciated.

 

Cheers