add comments on change description call

Author: agix

lib/msf/core/exploit/smb/psexec.rb

@@ -105,13 +105,13 @@ def psexec(command, disconnect=true, service_description=nil)
       vprint_status("#{peer} - Changing service description...")
       stubdata =
         svc_handle +
-        NDR.long(1) +
-        NDR.long(1) +
-        NDR.long(0x0200) +
+        NDR.long(1) + # dwInfoLevel = SERVICE_CONFIG_DESCRIPTION
+        NDR.long(1) + # lpInfo -> *SERVICE_DESCRIPTION
+        NDR.long(0x0200) + # SERVICE_DESCRIPTION struct
         NDR.long(0x04000200) +
         NDR.wstring(service_description)
       begin
-        response = dcerpc.call(0x25, stubdata)
+        response = dcerpc.call(0x25, stubdata) # ChangeServiceConfig2
       rescue Rex::Proto::DCERPC::Exceptions::Fault => e
         print_error("#{peer} - Error changing service description : #{e}")
       end