He doesn't actually exploit the heap overflow. He just sends messages as a normal backdoor user would, theres no authentication. (He also greps for the string

He doesn't actually exploit the heap overflow. He just sends messages as a normal backdoor user would, theres no authentication. (He also greps for the string the server sent upon connection, but it's nowhere to be found. He then just greps for bind and filters for binary files only, to find all binaries that call bind (remember dynamic linking in the end comes down to strings..))