Date: Wed, 17 Aug 2016 19:58:19 +0300 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Cc: Werner Koch <wk@...pg.org> Subject: Libgcrypt and GnuPG 1.4 RNG output prediction Hi, This was just announced on gnupg-announce and Twitter @gnupg, and I think it should also be in here: https://lists.gnupg.org/pipermail/gnupg-announce/2016q3/000395.html > Felix Drre and Vladimir Klebanov from the Karlsruhe Institute of > Technology found a bug in the mixing functions of Libgcrypt's random > number generator: An attacker who obtains 4640 bits from the RNG can > trivially predict the next 160 bits of output. This bug exists since > 1998 in all GnuPG and Libgcrypt versions. > > > Impact > ====== > All Libgcrypt and GnuPG versions released before 2016-08-17 are affected > on all platforms. > > A first analysis on the impact of this bug in GnuPG shows that existing > RSA keys are not weakened. For DSA and Elgamal keys it is also unlikely > that the private key can be predicted from other public information. > This needs more research and I would suggest _not to_ overhasty revoke > keys. Also off Twitter: <@rgacogne> @gnupg @solardiz The CVE number (CVE-2016-6316) seems to have been used to track another security issue rubygem-actionview, is that correct? There does in fact appear to be a CVE ID clash, with: http://www.openwall.com/lists/oss-security/2016/08/11/6 Alexander
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