Re: PHP Advanced Transfer Manager v1.20 ; Multiple Remote File Include Vulnerabilities

["Carsten Eilers" <ceilers-lists () gmx de>]

Hi,

l0x3 () hotmail com schrieb am Sun, 10 Sep 2006 17:19:00 +0000:

> +-------------------------------------------------------------------
>
> + Affected Software .: Software
>
> + Version .............: PHP Advanced Transfer Manager v1.20
>
> + Venedor ...........:   http://phpatm.free.fr/
>
> + Class .............: Remote File Inclusion
>
> + Risk ..............: High (Remote File Ex3cut1on)
>
> + Discovered by ..........: Eddy_BAck0o
>
> + Contact ...........: l0x3[at]hotmail.com ; www.LEzr.com/vB
>
> +--------------------------------------------------------------------
>
> ~ [Login.php]

There is no Login.php, this must be login.php...

> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> + include($include_location.'include/conf.php');
>
> + include($include_location.'include/common.'.$phpExt);
>
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

... and there we have

v 1.20:
$include_location = $HTTP_SERVER_VARS
['DOCUMENT_ROOT'].dirname($HTTP_SERVER_VARS['PHP_SELF'])."/";


v 1.30:
$include_location = dirname($HTTP_SERVER_VARS['SCRIPT_FILENAME'])."/";

Looks like an initialization, if my eyes are not to bad. ;-)

Same with all other reported files.


If there is no way to manipulate the used HTTP_SERVER_VARS
there is no way to include something.
For sure not via $include_location.

Let's take a look at the PHP-Manual:
<http://www.php.net/manual/en/reserved.variables.php>

* DOCUMENT_ROOT
     The document root directory under which the current 
     script is  executing, as defined in the server's 
     configuration file.

I guess if an attacker can manipulate the server's 
configuration file you have much more to worry about
as a remote file inclusion. :-)

* PHP_SELF
       The filename of the currently executing script, 
       relative to  the document root.

* SCRIPT_FILENAME
       The absolute pathname of the currently executing script.

If one of them can be manipulated from remote, than that 
may be a vulnerability in PHP or the webserver, but not 
in the PHP-scripts.
So there is no vulnerability.

Regards
  Carsten

-- 
Dipl.-Inform. Carsten Eilers
IT-Sicherheit und Datenschutz

<http://www.ceilers-it.de>