CVE-2018-0495

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CVE-2018-0495

Summary:

Details: Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

References: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=9010d1576e278a4274ad3f4aa15776c28f6ba965, http://www.securitytracker.com/id/1041144, http://www.securitytracker.com/id/1041147, https://access.redhat.com/errata/RHSA-2018:3221, https://access.redhat.com/errata/RHSA-2018:3505, https://access.redhat.com/errata/RHSA-2019:1296, https://access.redhat.com/errata/RHSA-2019:1297, https://access.redhat.com/errata/RHSA-2019:1543, https://access.redhat.com/errata/RHSA-2019:2237, https://lists.debian.org/debian-lts-announce/2018/06/msg00013.html, https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000426.html, https://usn.ubuntu.com/3689-1/, https://usn.ubuntu.com/3689-2/, https://usn.ubuntu.com/3692-1/, https://usn.ubuntu.com/3692-2/, https://usn.ubuntu.com/3850-1/, https://usn.ubuntu.com/3850-2/, https://www.debian.org/security/2018/dsa-4231, https://dev.gnupg.org/T4011, https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html, https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/