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