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FreeBSD : Mbed TLS -- Side channel attack on ECDSA (b70b880f-5727-11ea-a2f3-001cc0382b2f)

medium Nessus Plugin ID 133972

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

Janos Follath reports :

Our bignum implementation is not constant time/constant trace, so side channel attacks can retrieve the blinded value, factor it (as it is smaller than RSA keys and not guaranteed to have only large prime factors), and then, by brute force, recover the key.

Solution

Update the affected package.

See Also

http://www.nessus.org/u?b9ed5b3f

http://www.nessus.org/u?cc668fdd

Plugin Details

Severity: Medium

ID: 133972

File Name: freebsd_pkg_b70b880f572711eaa2f3001cc0382b2f.nasl

Version: 1.3

Type: local

Published: 2/25/2020

Updated: 3/26/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 1.9

Temporal Score: 1.4

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

CVSS Score Source: CVE-2019-18222

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:mbedtls, cpe:/o:freebsd:freebsd

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/24/2020

Vulnerability Publication Date: 10/25/2019

Reference Information

CVE: CVE-2019-18222