About Apple's limited information included with software updates
Apple generally provides very limited information about the specific bugs and patches that are being addressed by a given software update. For instance, in the latest updates for QuickTime and iTunes, it mentions "increase reliability, improve compatibility and enhance security," which has left many people frustrated and wanting to know whether the bugs they're experiencing have been addressed, and subsequently whether they should apply the update.
These rather limited and seemingly obvious statements in Apple's software updates are there simply because it does not want to advertise known bugs and exploits until patches have been widely distributed. Before or during an update's deployment, malicious software developers will have to find these known bugs on their own, which gives Apple time to develop and release patches before they can be exploited. In doing so, they are doing their best to ensure Mac users are protected.
