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Ubuntu 20.04 LTS : GnuTLS vulnerability (USN-4491-1)

high Nessus Plugin ID 140458

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-4491-1 advisory.

 - An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure. (CVE-2020-24659)

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

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-4491-1

Plugin Details

Severity: High

ID: 140458

File Name: ubuntu_USN-4491-1.nasl

Version: 1.4

Type: local

Agent: unix

Published: 9/9/2020

Updated: 10/20/2023

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, 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: 3.9

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

CVSS Score Source: CVE-2020-24659

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: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:gnutls-bin, p-cpe:/a:canonical:ubuntu_linux:guile-gnutls, p-cpe:/a:canonical:ubuntu_linux:libgnutls-dane0, p-cpe:/a:canonical:ubuntu_linux:libgnutls-openssl27, p-cpe:/a:canonical:ubuntu_linux:libgnutls28-dev, p-cpe:/a:canonical:ubuntu_linux:libgnutls30, p-cpe:/a:canonical:ubuntu_linux:libgnutlsxx28

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/9/2020

Vulnerability Publication Date: 9/4/2020

Reference Information

CVE: CVE-2020-24659

USN: 4491-1