Vulnerability CVE-2018-0495
Published: 2018-06-13   Modified: 2018-06-14

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.

Type:

CWE-200

 (Information Exposure)

CVSS2 => (AV:L/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
1.9/10
2.9/10
3.4/10
Exploit range
Attack complexity
Authentication
Local
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Redhat -> Enterprise linux 
Redhat -> Enterprise linux desktop 
Redhat -> Enterprise linux server 
Redhat -> Enterprise linux workstation 
Redhat -> Ansible tower 
Oracle -> Traffic director 
Gnupg -> Libgcrypt 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
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://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
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