CVE-2018-0495

Publication date 13 June 2018

Last updated 25 August 2025

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

4.7 · Medium

Score breakdown

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.

Status

Package Ubuntu Release Status
libgcrypt11 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty
Fixed 1.5.3-2ubuntu4.6
nss 19.04 disco
Not affected
18.10 cosmic
Fixed 2:3.36.1-1ubuntu1.1
18.04 LTS bionic
Fixed 2:3.35-2ubuntu2.1
17.10 artful Ignored end of life
16.04 LTS xenial
Fixed 2:3.28.4-0ubuntu0.16.04.4
14.04 LTS trusty
Fixed 2:3.28.4-0ubuntu0.14.04.4
openssl098 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
libgcrypt20 19.04 disco
Fixed 1.8.3-1ubuntu1
18.10 cosmic
Fixed 1.8.3-1ubuntu1
18.04 LTS bionic
Fixed 1.8.1-4ubuntu1.1
17.10 artful
Fixed 1.7.8-2ubuntu1.1
16.04 LTS xenial
Fixed 1.6.5-2ubuntu0.5
14.04 LTS trusty Not in release
openssl 19.04 disco
Fixed 1.1.0g-2ubuntu5
18.10 cosmic
Fixed 1.1.0g-2ubuntu5
18.04 LTS bionic
Fixed 1.1.0g-2ubuntu4.1
17.10 artful
Fixed 1.0.2g-1ubuntu13.6
16.04 LTS xenial
Fixed 1.0.2g-1ubuntu4.13
14.04 LTS trusty
Fixed 1.0.1f-1ubuntu2.26
openssl1.0 19.04 disco Not in release
18.10 cosmic
Fixed 1.0.2n-1ubuntu6
18.04 LTS bionic
Fixed 1.0.2n-1ubuntu5.1
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
nss
libgcrypt20
openssl

Severity score breakdown

Parameter Value
Base score 4.7 · Medium
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references