http://support.apple.com/kb/HT4131
Comex basically just diff'd what was fixed in the latest OSX patches against what was in the last iOS patch. Then read up on this patch that hasn't made it to iOS yet. FYI, this won't work if you have 4.1 beta or higher installed supposedly (cuz Apple already had the patch bundled up ready to go when they release the next build)...
The real credit goes to Charlie Miller who found this problem in the first place.
The funny thing I found was that Charlie Miller was given credit by Apple in the patch note.. "Credit to Charlie Miller working with TippingPoint's Zero Day Initiative for reporting this issue." but then Charlie tweets about p[articular exploit.. "Very beautiful work,"... "Scary how it totally defeats Apple's security architecture."
I cannot conceive that anybody will require multiplications at the rate of 40,000 or even 4,000 per hour ... -- F. H. Wales (1936)