Vulnerability Name:

CVE-2018-0495

Assigned:2017-11-27
Published:2018-06-13
Updated:2018-06-29
Summary: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 v3 Severity:5.1 Medium (CCN CVSS v3 Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
4.5 Medium (CCN Temporal CVSS v3 Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:4.0 Medium (CCN CVSS v2 Vector: AV:L/AC:H/Au:N/C:C/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): None
Availibility (A): None
References:Source: SECTRACK
Type: UNKNOWN
1041144

Source: SECTRACK
Type: UNKNOWN
1041147

Source: MISC
Type: UNKNOWN
https://dev.gnupg.org/T4011

Source: XF
Type: UNKNOWN
gnupg-cve20180495-info-disc(144828)

Source: MISC
Type: UNKNOWN
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=9010d1576e278a4274ad3f4aa15776c28f6ba965

Source: MLIST
Type: UNKNOWN
[debian-lts-announce] 20180629 [SECURITY] [DLA 1405-1] libgcrypt20 security update

Source: MISC
Type: UNKNOWN
https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000426.html

Source: UBUNTU
Type: UNKNOWN
USN-3689-1

Source: UBUNTU
Type: UNKNOWN
USN-3689-2

Source: UBUNTU
Type: UNKNOWN
USN-3692-1

Source: UBUNTU
Type: UNKNOWN
USN-3692-2

Source: DEBIAN
Type: UNKNOWN
DSA-4231

Source: MISC
Type: UNKNOWN
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/

Vulnerable Configuration:
Configuration CCN 1:
  • cpe:/a:gnupg:libgcrypt:1.7.9:*:*:*:*:*:*:*
  • OR cpe:/a:gnupg:libgcrypt:1.8.2:*:*:*:*:*:*:*

  • Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.artful:def:20180495000
    V
    CVE-2018-0495 on Ubuntu 17.10 (artful) - medium.
    2018-06-13
    oval:com.ubuntu.trusty:def:20180495000
    V
    CVE-2018-0495 on Ubuntu 14.04 LTS (trusty) - medium.
    2018-06-13
    oval:com.ubuntu.xenial:def:20180495000
    V
    CVE-2018-0495 on Ubuntu 16.04 LTS (xenial) - medium.
    2018-06-13
    BACK
    gnupg libgcrypt 1.7.9
    gnupg libgcrypt 1.8.2