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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