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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
local nmap = require "nmap"
local smb = require "smb"
local vulns = require "vulns"
local stdnse = require "stdnse"
local string = require "string"
description = [[
Attempts to detect if a Microsoft SMBv1 server is vulnerable to a remote code
execution vulnerability (ms17-010, a.k.a. EternalBlue).
The vulnerability is actively exploited by WannaCry and Petya ransomware and other malware.
The script connects to the $IPC tree, executes a transaction on FID 0 and
checks if the error "STATUS_INSUFF_SERVER_RESOURCES" is returned to
determine if the target is not patched against ms17-010. Additionally it checks
for known error codes returned by patched systems.
Tested on Windows XP, 2003, 7, 8, 8.1, 10, 2008, 2012 and 2016.
References:
* https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
* https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
* https://msdn.microsoft.com/en-us/library/ee441489.aspx
* https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/smb/smb_ms17_010.rb
* https://github.com/cldrn/nmap-nse-scripts/wiki/Notes-about-smb-vuln-ms17-010
]]
---
-- @usage nmap -p445 --script smb-vuln-ms17-010 <target>
-- @usage nmap -p445 --script vuln <target>
--
-- @see smb-double-pulsar-backdoor.nse
--
-- @output
-- Host script results:
-- | smb-vuln-ms17-010:
-- | VULNERABLE:
-- | Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010)
-- | State: VULNERABLE
-- | IDs: CVE:CVE-2017-0143
-- | Risk factor: HIGH
-- | A critical remote code execution vulnerability exists in Microsoft SMBv1
-- | servers (ms17-010).
-- |
-- | Disclosure date: 2017-03-14
-- | References:
-- | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143
-- | https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
-- |_ https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
--
-- @xmloutput
-- <table key="CVE-2017-0143">
-- <elem key="title">Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010)</elem>
-- <elem key="state">VULNERABLE</elem>
-- <table key="ids">
-- <elem>CVE:CVE-2017-0143</elem>
-- </table>
-- <table key="description">
-- <elem>A critical remote code execution vulnerability exists in Microsoft SMBv1
 servers (ms17-010).
</elem>
-- </table>
-- <table key="dates">
-- <table key="disclosure">
-- <elem key="month">03</elem>
-- <elem key="year">2017</elem>
-- <elem key="day">14</elem>
-- </table>
-- </table>
-- <elem key="disclosure">2017-03-14</elem>
-- <table key="refs">
-- <elem>https://technet.microsoft.com/en-us/library/security/ms17-010.aspx</elem>
-- <elem>https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143</elem>
-- <elem>https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/</elem>
-- </table>
-- </table>
--
-- @args smb-vuln-ms17-010.sharename Share name to connect. Default: IPC$
---
author = "Paulino Calderon <paulino()calderonpale.com>"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"vuln", "safe"}
hostrule = function(host)
return smb.get_port(host) ~= nil
end
local function check_ms17010(host, port, sharename)
local status, smbstate = smb.start_ex(host, true, true, "\\\\".. host.ip .. "\\" .. sharename, nil, nil, nil)
if not status then
stdnse.debug1("Could not connect to '%s'", sharename)
return false, string.format("Could not connect to '%s'", sharename)
else
local overrides = {}
local smb_header, smb_params, smb_cmd
stdnse.debug1("Connected to share '%s'", sharename)
overrides['parameters_length'] = 0x10
--SMB_COM_TRANSACTION opcode is 0x25
smb_header = smb.smb_encode_header(smbstate, 0x25, overrides)
smb_params = string.pack(">I2 I2 I2 I2 B B I2 I4 I2 I2 I2 I2 I2 B B I2 I2 I2 I2 I2 I2",
0x0, -- Total Parameter count (2 bytes)
0x0, -- Total Data count (2 bytes)
0xFFFF, -- Max Parameter count (2 bytes)
0xFFFF, -- Max Data count (2 bytes)
0x0, -- Max setup Count (1 byte)
0x0, -- Reserved (1 byte)
0x0, -- Flags (2 bytes)
0x0, -- Timeout (4 bytes)
0x0, -- Reserved (2 bytes)
0x0, -- ParameterCount (2 bytes)
0x4a00, -- ParameterOffset (2 bytes)
0x0, -- DataCount (2 bytes)
0x4a00, -- DataOffset (2 bytes)
0x02, -- SetupCount (1 byte)
0x0, -- Reserved (1 byte)
0x2300, -- PeekNamedPipe opcode
0x0, --
0x0700, -- BCC (Length of "\PIPE\")
0x5c50, -- \P
0x4950, -- IP
0x455c -- E\
)
stdnse.debug2("SMB: Sending SMB_COM_TRANSACTION")
local result, err = smb.smb_send(smbstate, smb_header, smb_params, '', overrides)
if(result == false) then
stdnse.debug1("There was an error in the SMB_COM_TRANSACTION request")
return false, err
end
local result, smb_header, _, _ = smb.smb_read(smbstate)
if not result then
stdnse.debug1("Error reading SMB response: %s", smb_header)
-- error can happen if an (H)IPS resets the connection
return false, smb_header
end
local _ , smb_cmd, err = string.unpack("<c4 B I4", smb_header)
if smb_cmd == 37 then -- SMB command for Trans is 0x25
stdnse.debug1("Valid SMB_COM_TRANSACTION response received")
--STATUS_INSUFF_SERVER_RESOURCES indicate that the machine is not patched
if err == 0xc0000205 then
stdnse.debug1("STATUS_INSUFF_SERVER_RESOURCES response received")
return true
elseif err == 0xc0000022 then
stdnse.debug1("STATUS_ACCESS_DENIED response received. This system is likely patched.")
return false, "This system is patched."
elseif err == 0xc0000008 then
stdnse.debug1("STATUS_INVALID_HANDLE response received. This system is likely patched.")
return false, "This system is patched."
end
stdnse.debug1("Error code received:%s", stdnse.tohex(err))
else
stdnse.debug1("Received invalid command id.")
return false, string.format("Unexpected SMB response:%s", stdnse.tohex(err))
end
end
end
action = function(host,port)
local vuln_status, err
local vuln = {
title = "Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010)",
IDS = {CVE = 'CVE-2017-0143'},
risk_factor = "HIGH",
description = [[
A critical remote code execution vulnerability exists in Microsoft SMBv1
servers (ms17-010).
]],
references = {
'https://technet.microsoft.com/en-us/library/security/ms17-010.aspx',
'https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/'
},
dates = {
disclosure = {year = '2017', month = '03', day = '14'},
}
}
local sharename = stdnse.get_script_args(SCRIPT_NAME .. ".sharename") or "IPC$"
local report = vulns.Report:new(SCRIPT_NAME, host, port)
vuln.state = vulns.STATE.NOT_VULN
vuln_status, err = check_ms17010(host, port, sharename)
if vuln_status then
stdnse.debug1("This host is missing the patch for ms17-010!")
vuln.state = vulns.STATE.VULN
else
vuln.state = vulns.STATE.NOT_VULN
vuln.check_results = err
end
return report:make_output(vuln)
end
|
