Amazon Linux 2 : bash (ALAS-2020-1503)

high Nessus Plugin ID 141999

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Synopsis

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

Description

The version of bash installed on the remote host is prior to 4.2.46-34. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2020-1503 advisory.

rbash in Bash before 4.4-beta2 did not prevent the shell user from modifying BASH_CMDS, thus allowing the user to execute any command with the permissions of the shell. (CVE-2019-9924)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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 bash' to update your system.

Plugin Details

Severity: High

ID: 141999

File Name: al2_ALAS-2020-1503.nasl

Version: 1.3

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/28/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2019-9924

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/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:bash-debuginfo, p-cpe:/a:amazon:linux:bash, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:bash-doc

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/22/2020

Vulnerability Publication Date: 3/22/2019

Reference Information

CVE: CVE-2019-9924

BID: 109277

ALAS: 2020-1503

Detections

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