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Merge pull request #746 from mpg/changelog-for-local-lucky13-2.7-restricted

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[Backport 2.7] Add a ChangeLog entry for local Lucky13 variant
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Manuel Pégourié-Gonnard 2020-08-26 11:52:29 +02:00 committed by GitHub
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Security
* In (D)TLS record decryption, when using a CBC ciphersuites without the
Encrypt-then-Mac extension, use constant code flow memory access patterns
to extract and check the MAC. This is an improvement to the existing
countermeasure against Lucky 13 attacks. The previous countermeasure was
effective against network-based attackers, but less so against local
attackers. The new countermeasure defends against local attackers, even
if they have access to fine-grained measurements. In particular, this
fixes a local Lucky 13 cache attack found and reported by Tuba Yavuz,
Farhaan Fowze, Ken (Yihan) Bai, Grant Hernandez, and Kevin Butler
(University of Florida) and Dave Tian (Purdue University).