I think that the performance improvements are also related to this problem... http://www.vnunet.com/news/1160551
The code for exploit the vulnerability is also available online, so the risk is quite high...
I've found the code for the exploit, don't think that posting the link is a right thing to do, wait for suggests... but i want to ask to people here if this version is upgradable for working also in iTunes 4.7.1...