A vulnerability in iOS 6 and OS X 10.8 Mountain Lion can crash apps and even render them unusable if certain strings of text are rendered. The text strings can cause Messages and Safari to crash, and can cause additional errors if a Wi-Fi network is named with the text. The problem is reportedly fixed in the betas of iOS 7 and OS X 10.9 Mavericks, but we expect Apple to address it in iOS 6 and Mountain Lion updates as well. follow link
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Encrypted Screen Sharing in Snow Leopard
In Snow Leopard, screen sharing in iChat can now be encrypted if both parties sharing a screen have MobileMe accounts and have enabled encryption (iChat > Preferences > Accounts > Security).
Text Display Bug Can Render Apps Unusable