Andrew Cunningham at Ars Technica:
In addition to the typical laundry list of updates and security fixes, the second major update to Mavericks fixes the “goto fail” SSL/TLS bug that Apple patched in iOS 7 on Friday.
If you haven’t done this yet, you should do so immediately. The OS X Mavericks v10.9.2 update notes are here and the iOS 7.0.6 update notes are here; you can grab the update through Software Update on either your Mac or iOS device.
Bad news for iOS 7.1 beta 5 users; still no fix for that at this point. It’s worth downgrading away from the beta if you’re rolling with it on your main phone, at least for now.