Amazon Linux 2 : libgcrypt (ALAS-2022-1769)

high Nessus Plugin ID 159557

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of libgcrypt installed on the remote host is prior to 1.5.3-14. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2022-1769 advisory.

- Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP. (CVE-2021-33560)

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

Solution

Run 'yum update libgcrypt' to update your system.

Plugin Details

Severity: High

ID: 159557

File Name: al2_ALAS-2022-1769.nasl

Version: 1.2

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 4/6/2022

Updated: 4/6/2022

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-33560

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libgcrypt, p-cpe:/a:amazon:linux:libgcrypt-devel, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:libgcrypt-debuginfo

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/4/2022

Vulnerability Publication Date: 6/8/2021

Reference Information

CVE: CVE-2021-33560

ALAS: 2022-1769

Detections

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