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

Low Nessus Plugin ID 133972

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VPR Score: 3.6

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: Low

ID: 133972

File Name: freebsd_pkg_b70b880f572711eaa2f3001cc0382b2f.nasl

Version: 1.2

Type: local

Published: 2020/02/25

Updated: 2020/02/27

Dependencies: 12634

Risk Information

Risk Factor: Low

VPR Score: 3.6

CVSS v2.0

Base Score: 1.9

Temporal Score: 1.4

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

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: 2020/02/24

Vulnerability Publication Date: 2019/10/25

Reference Information

CVE: CVE-2019-18222