This check can be handy

modules/exploits/windows/http/sws_connection_bof.rb

@@ -62,6 +62,15 @@ class Metasploit3 < Msf::Exploit::Remote
 			'DefaultTarget'  => 0))
 	end
 
+	def check
+		res = send_request_raw({'uri'=>'/'})
+		if res and res.headers['Server'] =~ /PMSoftware\-SWS\/2\.[0-2]/
+			return Exploit::CheckCode::Vulnerable
+		end
+
+		return Exploit::CheckCode::Safe
+	end
+
 	def exploit
 
 		sploit = payload.encoded