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FreeBSD : openssl -- timing attack vulnerability (7caebe30-d7f1-11e6-a9a5-b499baebfeaf)

medium Nessus Plugin ID 96412

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

Cesar Pereida Garcia reports :

The signing function in crypto/ecdsa/ecdsa_ossl.c in certain OpenSSL versions and forks is vulnerable to timing attacks when signing with the standardized elliptic curve P-256 despite featuring constant-time curve operations and modular inversion. A software defect omits setting the BN_FLG_CONSTTIME flag for nonces, failing to take a secure code path in the BN_mod_inverse method and therefore resulting in a cache-timing attack vulnerability. A malicious user with local access can recover ECDSA P-256 private keys.

Solution

Update the affected packages.

See Also

https://seclists.org/oss-sec/2017/q1/52

http://www.nessus.org/u?157ec83d

Plugin Details

Severity: Medium

ID: 96412

File Name: freebsd_pkg_7caebe30d7f111e6a9a5b499baebfeaf.nasl

Version: 3.6

Type: local

Published: 1/12/2017

Updated: 1/4/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 2.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:libressl, p-cpe:/a:freebsd:freebsd:libressl-devel, p-cpe:/a:freebsd:freebsd:openssl, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 1/11/2017

Vulnerability Publication Date: 1/10/2017

Reference Information

CVE: CVE-2016-7056