The SSLVerifySignedServerKeyExchange function in libsecurity_ssl/lib/sslKeyExchange.c in the Secure Transport feature in the Data Security component in Apple iOS 6.x before 6.1.6 and 7.x before 7.0.6, Apple TV 6.x before 6.0.2, and Apple OS X 10.9.x before 10.9.2 does not check the signature in a TLS Server Key Exchange message, which allows man-in-the-middle attackers to spoof SSL servers by (1) using an arbitrary private key for the signing step or (2) omitting the signing step.
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support.apple.com/kb/HT6146
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support.apple.com/kb/HT6148
support.apple.com/kb/HT6150
news.ycombinator.com/item?id=7281378
www.cs.columbia.edu/~smb/blog/2014-02/2014-02-23.html
www.cs.columbia.edu/~smb/blog/2014-02/2014-02-24.html
www.imperialviolet.org/2014/02/22/applebug.html