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APPLE-SA-2017-12-13-2 tvOS 11.2.1

tvOS 11.2.1 is now available and addresses the following:

HomeKit
Available for: Apple TV 4K and Apple TV (4th generation)
Impact: A remote attacker may be able to unexpectedly alter
application state
Description: A message handling issue was addressed with improved
input validation.
CVE-2017-13903: Tian Zhang

Installation note:

Apple TV will periodically check for software updates. Alternatively,
you may manually check for software updates by selecting
"Settings -> System -> Software Update -> Update Software."

To check the current version of software, select
"Settings -> General -> About."

Information will also be posted to the Apple Security Updates
web site: https://support.apple.com/kb/HT201222

This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/
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