Again, this is 100% inaccurate. Jailbreaking alone will not make you vulnerable. You keep implying that it does.
This hackers released code only works if you actively install SSH and do not change the default password. He could put the code on a billboard in Times Square, but that is not going to change the fact that this code only works when SSH is installed and the password is not changed. Nothing based on this code will ever run unless you do those two things. There will always people who don't change the passwords on their gear. See the millions of wireless routers out there with the default password or the people who run Windows as Administrator. The user creates the problem, not jailbreaking the phone. This is not even an exploit or a security hole; if you know the password you are not even hacking into the system. It is unauthorized access to the system.
And of course jailbreaking allows you to run unsigned software. That is the point. I could install a trojan. I could install a trojan on my Mac as well. I take the same care installing software on my phone as I do on my computer.
But keep the scare tactics going. You have a career in politics waiting for you if you so choose.