1 files changed, 113 insertions, 0 deletions
diff --git a/scripts/rexec-brute.nse b/scripts/rexec-brute.nse
new file mode 100644
index 0000000..4e09e83
--- /dev/null
+++ b/scripts/rexec-brute.nse
@@ -0,0 +1,113 @@
+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