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Date: Wed, 2 Sep 2015 16:08:43 +0200
From: Florian Weimer <fweimer@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Factoring RSA Keys With TLS Perfect Forward Secrecy
It turns out that Lenstra's 1996 side-channel attack on the RSA-CRT
optimization still works against some TLS servers:
<https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/>
<https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf>
Fortunately, none of the key leaks were attributed to publicly available
free software. OpenSSL upstream and NSS already have RSA-CRT hardening.
OpenJDK was updated in April 2015, as CVE-2015-0478.
libgcrypt upstream received the hardening very recently:
<http://lists.gnupg.org/pipermail/gcrypt-devel/2015-September/003553.html>
For Go, I opened an issue: <https://github.com/golang/go/issues/12453>
Nettle would also benefit from RSA-CRT hardening. I started a
discussion here:
<http://thread.gmane.org/gmane.comp.encryption.nettle.bugs/1359>
I don't think CVE assignments are needed (although the OpenJDK hardening
received one).
--
Florian Weimer / Red Hat Product Security
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