CVE-2018-12439

Publication date 15 June 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

MatrixSSL through 3.9.5 Open 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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
matrixssl	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

Notes

msalvatore

patch at https://private-fileshare.canonical.com/~ubuntu-security/patches/psEccGenerateScalar.patch

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