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Debian DLA-3634-1 : nss - LTS security update

medium Nessus Plugin ID 183996

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Synopsis

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

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3634 advisory.

 - A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58. (CVE-2020-25648)

 - new tlsfuzzer code can still detect timing issues in RSA operations (CVE-2023-4421) (CVE-2023-4421)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the nss packages.

For Debian 10 buster, these problems have been fixed in version 2

See Also

https://security-tracker.debian.org/tracker/source-package/nss

https://www.debian.org/lts/security/2023/dla-3634

https://security-tracker.debian.org/tracker/CVE-2020-25648

https://security-tracker.debian.org/tracker/CVE-2023-4421

https://packages.debian.org/source/buster/nss

Plugin Details

Severity: Medium

ID: 183996

File Name: debian_DLA-3634.nasl

Version: 1.1

Type: local

Agent: unix

Published: 10/28/2023

Updated: 12/22/2023

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.1

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

CVSS Score Source: CVE-2020-25648

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 6

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

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

CVSS Score Source: CVE-2023-4421

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libnss3, p-cpe:/a:debian:debian_linux:libnss3-dev, p-cpe:/a:debian:debian_linux:libnss3-tools, cpe:/o:debian:debian_linux:10.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/28/2023

Vulnerability Publication Date: 10/20/2020

Reference Information

CVE: CVE-2020-25648, CVE-2023-4421