
The iPhone updates addresses holes in CoreAudio, WebKit and MobileMail. QuickTime, which is no stranger to security updates, also had several security problems that could allow attackers to hijack a machine. They related to how QuickTime handled manipulated H.264 and MPEG-4 files.
One one of the 47 fixes was for the Snow Leopard operating system (though it was updated to fix other issues with the new OS), only recently released. The single fix only updated the Flash software to the latest and most secure version.