There is absolutely no backdoor in Tor.
But that said, there are still plenty of subtle attacks people might try.
Tor Backdoor Released
This shell works by sending a modified Base64 HTTPS request to »tor-proxy.net/. tor-proxy.net
will then forward an HTTP request to a .onion server that is specified on the command line.
"what we know we know the same, what we don't know, we don't know it differently."
Help yourself so God can help you.
Microsoft MVP, 2006 - 2009