The firmware 3.0.1 update is available through iTunes. However, as usual when the iPhone OS is updated, jailbreakers (and unlockers) should stay away from it should they want to keep their jailbreak. Updating to 3.0.1 will remove the jailbreak!
In a hypocritical statement about the fix, an Apple rep said:
We appreciate the information provided to us about SMS vulnerabilities which affect several mobile phone platforms. This morning, less than 24 hours after a demonstration of this exploit, we’ve issued a free software update that eliminates the vulnerability from the iPhone. Contrary to what’s been reported, no one has been able to take control of the iPhone to gain access to personal information using this exploit.
I say it’s hypocritical because Apple had been warned about this for over a month.
So again, if you want to keep your jailbreak or unlock, do not update. Let’s wait to see what the Dev Team has to say about this update.
I will update the iPhone downloads page with the latest firmwares as soon as I get a hold of them.