From: Apple Product Security
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APPLE-SA-2015-08-13-3 iOS 8.4.1

iOS 8.4.1 is now available and addresses the following:

AppleFileConduit
Available for:  iPhone 4s and later,
iPod touch (5th generation) and later, iPad 2 and later
Impact:  A maliciously crafted afc command may allow access to
protected parts of the filesystem [...]