CVE-2018-0495 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

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://dev.gnupg.org/T4011 https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=9010d1576e278a4274ad3f4aa15776c28f6ba965 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://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

4.7