A side-channel attack was found which makes use of cache-bank conflicts on the Intel Sandy-Bridge microarchitecture which could lead to the recovery of RSA keys. The ability to exploit this issue is limited as it relies on an attacker who has control of code in a thread running on the same hyper-threaded core as the victim thread which is performing decryptions.
This issue affects OpenSSL versions 1.0.2 and 1.0.1.
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Uhh... Umm... OK. How does one decide to start looking at hardware cache-bank conflicts to hack RSA keys?
Worse yet, how is a programmer supposed to think of this stuff in his "brainstorm what can go wrong" phase of programming? "Oh, I need to alter my code to ensure it uses different cache banks on Sandy-Bridge." This is insane.