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
|
local brute = require "brute"
local creds = require "creds"
local shortport = require "shortport"
local stdnse = require "stdnse"
description=[[
Performs brute force password auditing against the classic UNIX rexec (remote exec) service.
]]
---
-- @usage
-- nmap -p 512 --script rexec-brute <ip>
--
-- @output
-- PORT STATE SERVICE
-- 512/tcp open exec
-- | rexec-brute:
-- | Accounts
-- | nmap:test - Valid credentials
-- | Statistics
-- |_ Performed 16 guesses in 7 seconds, average tps: 2
--
-- @args rexec-brute.timeout socket timeout for connecting to rexec (default 10s)
-- Version 0.1
-- Created 11/02/2011 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
author = "Patrik Karlsson"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"brute", "intrusive"}
portrule = shortport.port_or_service(512, "exec", "tcp")
--- Copied from telnet-brute
-- Decide whether a given string (presumably received from a telnet server)
-- indicates a failed login
--
-- @param str The string to analyze
-- @return Verdict (true or false)
local is_login_failure = function (str)
local lcstr = str:lower()
return lcstr:find("%f[%w]incorrect%f[%W]")
or lcstr:find("%f[%w]failed%f[%W]")
or lcstr:find("%f[%w]denied%f[%W]")
or lcstr:find("%f[%w]invalid%f[%W]")
or lcstr:find("%f[%w]bad%f[%W]")
end
Driver = {
-- creates a new Driver instance
-- @param host table as received by the action function
-- @param port table as received by the action function
-- @return o instance of Driver
new = function(self, host, port, options)
local o = { host = host, port = port, timeout = options.timeout }
setmetatable(o, self)
self.__index = self
return o
end,
connect = function(self)
self.socket = brute.new_socket()
self.socket:set_timeout(self.timeout)
local status, err = self.socket:connect(self.host, self.port)
if ( not(status) ) then
local err = brute.Error:new("Connection failed")
err:setRetry( true )
return false, err
end
return true
end,
login = function(self, username, password)
local cmd = "id"
local data = ("\0%s\0%s\0%s\0"):format(username, password, cmd)
local status, err = self.socket:send(data)
if ( not(status) ) then
local err = brute.Error:new("Send failed")
err:setRetry( true )
return false, err
end
local response
status, response = self.socket:receive()
if ( status and not is_login_failure(response)) then
return true, creds.Account:new(username, password, creds.State.VALID)
end
return false, brute.Error:new( "Incorrect password" )
end,
disconnect = function(self)
self.socket:close()
end,
}
local arg_timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME .. ".timeout"))
arg_timeout = (arg_timeout or 10) * 1000
action = function(host, port)
local options = {
timeout = arg_timeout
}
local engine = brute.Engine:new(Driver, host, port, options)
engine.options.script_name = SCRIPT_NAME
local status, result = engine:start()
return result
end
|
