FreeBSD : OpenSSL remote denial of service vulnerability (012809ce-83f3-11ea-92ab-00163e433440)

high Nessus Plugin ID 135880

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Synopsis

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

Description

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the 'signature_algorithms_cert' TLS extension. The crash occurs if an invalid or unrecognized signature algorithm is received from the peer.
Impact : A malicious peer could exploit the NULL pointer dereference crash, causing a denial of service attack.

Solution

Update the affected package.

See Also

https://www.openssl.org/news/secadv/20200421.txt

http://www.nessus.org/u?8ba68bae

Plugin Details

Severity: High

ID: 135880

File Name: freebsd_pkg_012809ce83f311ea92ab00163e433440.nasl

Version: 1.7

Type: local

Published: 4/22/2020

Updated: 12/11/2020

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2020-1967

VPR

Risk Factor: Medium

Score: 6.1

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

Temporal Vector: E:POC/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

Temporal Vector: E:P/RL:O/RC:C

Vulnerability Information

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/21/2020

Vulnerability Publication Date: 4/21/2020

Reference Information

CVE: CVE-2020-1967

FreeBSD: SA-20:11.openssl

IAVA: 2020-A-0186-S