Alibaba Cloud Linux 3 : 0008: gnutls (ALINUX3-SA-2021:0008)

high Nessus Plugin ID 236485

Synopsis

The remote Alibaba Cloud Linux host is missing one or more security updates.

Description

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2021:0008 advisory.

Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

CVE-2019-3829:
A vulnerability was found in gnutls versions from 3.5.8 before 3.6.7. A memory corruption (double free) vulnerability in the certificate verification API. Any client or server application that verifies X.509 certificates with GnuTLS 3.5.8 or later is affected.

CVE-2019-3836:
It was discovered in gnutls before version 3.6.7 upstream that there is an uninitialized pointer access in gnutls versions 3.6.3 or later which can be triggered by certain post-handshake messages.

CVE-2020-11501:
GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.

CVE-2020-13777:
GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application.

CVE-2020-24659:
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.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

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

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 236485

File Name: alinux3_sa_2021-0008.nasl

Version: 1.1

Type: local

Family: Alibaba Cloud Linux Local Security Checks

Published: 5/14/2025

Updated: 5/14/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.5

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: 6.7

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:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-dane-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-utils-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-c%2b%2b, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-c%2b%2b-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-utils, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-dane, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:gnutls-debugsource

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/Alibaba/release, Host/Alibaba/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/10/2021

Vulnerability Publication Date: 2/28/2019

Reference Information

CVE: CVE-2019-3829, CVE-2019-3836, CVE-2020-11501, CVE-2020-13777, CVE-2020-24659

Detections

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