bugtraq - Re: how to trick most of cms avatar upload filter [exemple for : RunCms (PoC)]

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Date: Thu, 02 Nov 2006 21:56:49 +0200
From: Taneli Leppä <taneli@...sman.fi>
To: securfrog@...il.com
Cc: bugtraq@...urityfocus.com
Subject: Re: how to trick most of cms avatar upload filter [exemple for :
 RunCms (PoC)]

Hi,

securfrog@...il.com kirjoitti:
> then you need to take a good file editor , like: notepad++ 
> (you can take whatever picture , and edit it without destroying it .)
> we need to put some php code AFTER the picture code . 
> when  it's done , try the picture if it still work , if yes , we are ok :).

This actually seems to work. A quick workaround is to disable PHP in the
directory where the avatar images are stored (or any user-uploaded files
for that matter) in Apache:

<Directory "/var/www/html/forum/avatardir">
   php_admin_flag engine off
</Directory>

-- 
   Taneli Leppä         | Crasman Co Ltd
   <taneli@...sman.fi>  | <http://www.crasman.fi/>