o [NSE] Added script iax2-brute and supporting IAX2 library that performs

brute-force password guessing against the Asterisk IAX2 protocol. [Patrik]

scripts/iax2-brute.nse

@@ -0,0 +1,74 @@
+description = [[
+Performs brute force password guessing against the Asterisk IAX2 protocol.
+Guessing fails when a large number of attempts is made due to the maxcallnumber limit (default 2048).
+In case your getting "ERROR: Too many retries, aborted ..." after a while, this is most likely what's happening.
+In order to avoid this problem try:
+  - reducing the size of your dictionary 
+  - use the brute delay option to introduce a delay between guesses
+  - split the guessing up in chunks and wait for a while between them
+]]
+
+---
+-- @usage
+-- nmap -sU -p 4569 <ip> --script iax2-brute
+--
+-- @output
+-- PORT     STATE         SERVICE
+-- 4569/udp open|filtered unknown
+-- | iax2-brute: 
+-- |   Accounts
+-- |     1002:password12 - Valid credentials
+-- |   Statistics
+-- |_    Performed 1850 guesses in 2 seconds, average tps: 925
+--
+--
+
+author = "Patrik Karlsson"
+license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
+categories = {"intrusive", "brute"}
+
+require 'brute'
+require 'shortport'
+require 'iax2'
+
+portrule = shortport.port_or_service(4569, "iax2", {"udp", "tcp"})
+
+Driver = {
+	
+	new = function(self, host, port)
+		local o = { host = host, port = port }
+       	setmetatable(o, self)
+        self.__index = self
+		return o
+	end,
+	
+	connect = function(self)
+		self.helper = iax2.Helper:new(self.host, self.port)
+		return self.helper:connect()
+	end,
+	
+	login = function(self, username, password)
+		local status, resp = self.helper:regRelease(username, password)
+		if ( status ) then
+			return true, brute.Account:new( username, password, creds.State.VALID )
+		elseif ( resp == "Release failed" ) then
+			return false, brute.Error:new( "Incorrect password" )
+		else
+			local err = brute.Error:new(resp)
+			err:setRetry(true)
+			return false, err
+		end
+	end,
+	
+	disconnect = function(self) return self.helper:close() end,
+}
+
+
+
+
+action = function(host, port)
+	local engine = brute.Engine:new(Driver, host, port)
+	engine.options.script_name = SCRIPT_NAME
+	status, result = engine:start()
+	return result
+end

scripts/script.db

@@ -142,6 +142,7 @@ Entry { filename = "http-waf-detect.nse", categories = { "discovery", "intrusive
 Entry { filename = "http-wordpress-brute.nse", categories = { "brute", "intrusive", } }
 Entry { filename = "http-wordpress-enum.nse", categories = { "auth", "intrusive", "vuln", } }
 Entry { filename = "http-wordpress-plugins.nse", categories = { "discovery", "intrusive", } }
+Entry { filename = "iax2-brute.nse", categories = { "brute", "intrusive", } }
 Entry { filename = "iax2-version.nse", categories = { "version", } }
 Entry { filename = "imap-brute.nse", categories = { "auth", "intrusive", } }
 Entry { filename = "imap-capabilities.nse", categories = { "default", "safe", } }