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IT Security and Insecurity Portal |
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Vulnerability in phpBB3? (watch the posted code pls) |
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 Posted: Fri Nov 07, 2008 2:55 pm |
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| _mranderson_ |
| Valuable expert |
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| Joined: Oct 30, 2008 |
| Posts: 51 |
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I downloaded phpBB3 from http://www.phpbb.com/
to have a look at the code.
This code is from /download/file.php inside the phpbb root directory:
| Code: | define('IN_PHPBB', true);
$phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './../';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
if (isset($_GET['avatar']))
{
require($phpbb_root_path . 'config.' . $phpEx);
require($phpbb_root_path . 'includes/acm/acm_' . $acm_type . '.' . $phpEx);
require($phpbb_root_path . 'includes/cache.' . $phpEx);
require($phpbb_root_path . 'includes/db/' . $dbms . '.' . $phpEx);
require($phpbb_root_path . 'includes/constants.' . $phpEx); |
now let's see phpbbrootpath is defined, phpex is defined, but what about $acm_type? and what about $dbms?
now, I think $dbms is usually deifned in config.php (which is included first) so no LFI is possible, but what about $acm_type?
I tried to call /download/file.php?avatar=dummy&acm_type=%00 and I got 500 internal server error as response... hum... do you guys think LFI is possible? also when I tried dbms=../../index I got a white page...
tell me your opinion... |
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| Posted: Fri Nov 07, 2008 6:26 pm |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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You missed "config.php":
| Code: |
<?php
// phpBB 3.0.x auto-generated configuration file
// Do not change anything in this file!
$dbms = 'mysqli';
$dbhost = 'localhost';
$dbport = '';
$dbname = 'phpbb302';
$dbuser = '****';
$dbpasswd = '****';
$table_prefix = 'phpbb_';
$acm_type = 'file';
$load_extensions = '';
@define('PHPBB_INSTALLED', true);
// @define('DEBUG', true);
// @define('DEBUG_EXTRA', true);
?>
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So these variables are allready defined. And by the way - here is same code from phpbb 3.0.2:
| Code: |
define('IN_PHPBB', true);
$phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './../';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
if (isset($_GET['avatar']))
{
require($phpbb_root_path . 'config.' . $phpEx);
if (!defined('PHPBB_INSTALLED') || empty($dbms) || empty($acm_type))
{
exit;
}
require($phpbb_root_path . 'includes/acm/acm_' . $acm_type . '.' . $phpEx);
require($phpbb_root_path . 'includes/cache.' . $phpEx);
require($phpbb_root_path . 'includes/db/' . $dbms . '.' . $phpEx);
require($phpbb_root_path . 'includes/constants.' . $phpEx);
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It seems to me, that developers have been extra cautions about possible LFI.
And finally - as for this moment, "register_globals=on" is rare thing to see in real world servers  |
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| Posted: Fri Nov 07, 2008 7:03 pm |
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| _mranderson_ |
| Valuable expert |
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| Joined: Oct 30, 2008 |
| Posts: 51 |
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Oh well, exactly as I expected...  |
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