Handle ipv6 addresses, choose more obvious 'bad' password for

fingerprinting

lib/msf/core/exploit/postgres.rb

@@ -52,6 +52,11 @@ module Exploit::Remote::Postgres
 		ip = args[:server]         || datastore['RHOST']
 		port = args[:port]         || datastore['RPORT']
 		uri = "tcp://#{ip}:#{port}"
+		
+		if Rex::Socket.is_ipv6?(ip)
+			uri = "tcp://[#{ip}]:#{port}"
+		end
+		
 		verbose = args[:verbose]   || datastore['VERBOSE']
 		begin
 			self.postgres_conn = Connection.new(db,username,password,uri)
@@ -234,7 +239,7 @@ module Exploit::Remote::Postgres
 		if datastore['PASSWORD'].to_s.size > 0
 			datastore['PASSWORD'].to_s
 		else
-			Rex::Text.rand_text_english(rand(6)+2)
+			'INVALID_' + Rex::Text.rand_text_alpha(rand(6))
 		end
 	end