Re: PHP Security Risk?
From: Simon (simon_at_xhz.ca)
Date: Thu, 02 Dec 2004 15:35:36 -0500 To: Stephane Auger <firstname.lastname@example.org>
It all depends on how you handle the file after it has been uploaded. Is it
sent in a public directory, accessible from the web?
Take the following very simple example:
I have a very malicious PHP script that gets all the information I need to crack
I upload it through the upload script you have.
I execute the file because it is now on your server and is public.
The upload in itself is not a problem. It's what you do with the uploaded data
that may cause trouble. Remember to never ever trust what can be input from
public users (even private users), variables, get/post, files...
Stephane Auger wrote:
> Hi guys,
> I don't know if this is the right mailing list to ask this, if not
> don't hesitate to warn me. I'm using a Windows Server 2003 with IIS6
> and PHP5. Fully patched, by the way. Someone asked me to enable the
> file-upload function in PHP so people could upload files to his web
> site, which is one of many I host. Does anyone know if file uploading
> in PHP could cause a security risk on the server? I know there used to
> be many flaws in the old versions, but I don't know about now... I
> haven't seen anything recent about this. Thanks for your help!
> Stephane Auger