CVE-2018-12437

Publication date 15 June 2018

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.9 · Medium

Score breakdown

LibTomCrypt through 1.18.1 allows a memory-cache side-channel attack on ECDSA signatures, 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.

From the Ubuntu Security Team

It was discovered that LibTomCrypt incorrectly handled ECDSA signatures. A local attacker could possibly use this issue to obtain sensitive information.

Status

Package Ubuntu Release Status
libtomcrypt 18.04 LTS bionic
Fixed 1.18.1-1ubuntu0.1
17.10 artful Ignored end of life
16.04 LTS xenial
Fixed 1.17-7ubuntu0.1
14.04 LTS trusty
Fixed 1.17-5ubuntu0.1

Severity score breakdown

Parameter Value
Base score 4.9 · Medium
Attack vector Physical
Attack complexity High
Privileges required None
User interaction None
Scope Changed
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N