Detections
Analytics

Amazon Linux 2 : zsh (ALAS-2022-1757)

high Nessus Plugin ID 158590

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Synopsis

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

Description

The version of zsh installed on the remote host is prior to 5.8.1-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2022-1757 advisory.

 - In zsh before 5.8.1, an attacker can achieve code execution if they control a command output inside the prompt, as demonstrated by a %F argument. This occurs because of recursive PROMPT_SUBST expansion.
 (CVE-2021-45444)

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 zsh' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2022-1757.html

https://alas.aws.amazon.com/cve/html/CVE-2021-45444.html

Plugin Details

Severity: High

ID: 158590

File Name: al2_ALAS-2022-1757.nasl

Version: 1.2

Type: local

Agent: unix

Published: 3/4/2022

Updated: 3/4/2022

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 5.1

Temporal Score: 3.8

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

CVSS Score Source: CVE-2021-45444

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:zsh-html, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:zsh-debuginfo, p-cpe:/a:amazon:linux:zsh

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/1/2022

Vulnerability Publication Date: 2/12/2022

Reference Information

CVE: CVE-2021-45444

ALAS: 2022-1757