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FreeBSD : GnuTLS -- flaw in TLS session ticket key construction (ef5b4f5f-a658-11ea-80d7-001cc0382b2f)

high Nessus Plugin ID 137169

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Synopsis

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

Description

The GnuTLS project reports :

It was found that GnuTLS 3.6.4 introduced a regression in the TLS protocol implementation. This caused the TLS server to not securely construct a session ticket encryption key considering the application supplied secret, allowing a MitM attacker to bypass authentication in TLS 1.3 and recover previous conversations in TLS 1.2.

Solution

Update the affected package.

See Also

https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03

http://www.nessus.org/u?295f348d

Plugin Details

Severity: High

ID: 137169

File Name: freebsd_pkg_ef5b4f5fa65811ea80d7001cc0382b2f.nasl

Version: 1.3

Type: local

Published: 6/5/2020

Updated: 6/12/2020

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2020-13777

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

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

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:gnutls, 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: 6/4/2020

Vulnerability Publication Date: 6/3/2020

Reference Information

CVE: CVE-2020-13777