Folks! It is not exactly a theme nor precisely the support

Hi, Folks!
It is not exactly a theme nor precisely the support one...My question is about TimThumb. In wordfence I have been asked whether I want to delete those files because they make the site more vulnerable to hackers.
My question: with what should I replace TimThumb in case I want to delete those files?
Thank you.
Best Regards!
David R