Security - Secure Transport
Available for: OS X Mountain Lion v10.8.5, OS X Mavericks v10.9.2
Impact: An attacker with a privileged network position may capture
data or change the operations performed in sessions protected by SSL
Description: In a 'triple handshake' attack, it was possible for an attacker to establish two connections which had the same encryption keys and handshake, insert the attacker's data in one connection, and renegotiate so that the connections may be forwarded to each other.
To prevent attacks based on this scenario, Secure Transport was changed so that, by default, a renegotiation must present the same server certificate as was presented in the original connection. This issue does not affect Mac OS X 10.7 systems and earlier.
CVE-ID CVE-2014-1295 : Antoine Delignat-Lavaud, Karthikeyan Bhargavan and Alfredo Pironti of Prosecco at Inria Paris
That doesn't sound good…