Apple has just released iPhone OS 3.0.1 which fixed SMS vulnerability. Recently this issue was discovered by Charlie
Miller at Black Hat cyber security conference in LA.
This bug may lead to an unexpected service interruption or arbitrary code execution. Apple iPhone OS 3.0.1 comes with fix for SMS bug and is only available via iTunes and can’t be downloaded from Apple website. There is no direct download link available to download latest iPhone OS 3.0.1.

How to Upgrade to iPhone OS 3.0.1
1. Connect your iPhone to computer and start iTunes
2. A message will be displayed to download OS 3.0.1
3. Click on Download & Install.
If you want to direct download iPhone OS 3.0.1 on your computer here are direct download link.
iPhone
iPhone OS 3.0.1
iPhone 3G OS 3.0.1
iPhone 3GS
iPhone 3GS OS 3.0.1

