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Amazon Linux AMI : sudo (ALAS-2021-1478)

high Nessus Plugin ID 145451

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Synopsis

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

Description

The version of sudo installed on the remote host is prior to 1.8.23-9.56. It is, therefore, affected by a vulnerability as referenced in the ALAS-2021-1478 advisory.

 - When sudo runs a command in shell mode, either via the -s or -i command line option, it escapes special characters in the command's arguments with a backslash. The sudoers policy plugin will then remove the escape characters from the arguments before evaluating the sudoers policy (which doesn't expect the escape characters) if the command is being run in shell mode. (CVE-2021-3156)

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 sudo' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2021-1478.html

https://access.redhat.com/security/cve/CVE-2021-3156

Plugin Details

Severity: High

ID: 145451

File Name: ala_ALAS-2021-1478.nasl

Version: 1.10

Type: local

Agent: unix

Published: 1/26/2021

Updated: 1/18/2023

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

Risk Information

VPR

Risk Factor: Critical

Score: 9.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

CVSS Score Source: CVE-2021-3156

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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:H/RL:O/RC:C

Vulnerability Information

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/26/2021

Vulnerability Publication Date: 1/26/2021

CISA Known Exploited Vulnerability Due Dates: 4/27/2022

Exploitable With

CANVAS (CANVAS)

Core Impact

Metasploit (Sudo Heap-Based Buffer Overflow)

Reference Information

CVE: CVE-2021-3156

ALAS: 2021-1478

IAVA: 2021-A-0053