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Apple on Friday released an update to its iOS mobile operating system for the iPhone, iPad and iPod touch, addressing a potentially dangerous security flaw related to viewing PDF files in the Mobile Safari Web browser.



From Apple Insider:
iOS 4.3.4 can be downloaded and installed to any currently supported iOS-based devices by connecting to iTunes and choosing to update. Apple has characterized the latest software as a security update, and does not contain any new features or fixes.

The update is available for the GSM iPhone 4, iPhone 3GS, iPad 2, iPad, and third- and fourth-generation iPod touch. Another firmware, iOS 4.2.9, is also available for the CDMA iPhone 4 for Verizon users.
  Apple releases iOS 4.3.4 to address PDF security hole