Detections
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Amazon Linux 2 : nginx (ALASNGINX1-2023-003)

high Nessus Plugin ID 181960

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Synopsis

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

Description

The version of nginx installed on the remote host is prior to 1.20.0-2. It is, therefore, affected by a vulnerability as referenced in the ALAS2NGINX1-2023-003 advisory.

 A flaw was found in nginx. An off-by-one error while processing DNS responses allows a network attacker to write a dot character out of bounds in a heap allocated buffer which can allow overwriting the least significant byte of next heap chunk metadata likely leading to a remote code execution in certain circumstances. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-23017)

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 nginx' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALASNGINX1-2023-003.html

https://alas.aws.amazon.com/cve/html/CVE-2021-23017.html

https://alas.aws.amazon.com/faqs.html

Plugin Details

Severity: High

ID: 181960

File Name: al2_ALASNGINX1-2023-003.nasl

Version: 1.2

Type: local

Agent: unix

Published: 9/27/2023

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: 6.3

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2021-23017

CVSS v3

Risk Factor: High

Base Score: 7.7

Temporal Score: 6.9

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:nginx, p-cpe:/a:amazon:linux:nginx-mod-mail, p-cpe:/a:amazon:linux:nginx-mod-http-perl, p-cpe:/a:amazon:linux:nginx-mod-stream, p-cpe:/a:amazon:linux:nginx-mod-http-image-filter, p-cpe:/a:amazon:linux:nginx-all-modules, p-cpe:/a:amazon:linux:nginx-mod-http-xslt-filter, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:nginx-debuginfo, p-cpe:/a:amazon:linux:nginx-filesystem, p-cpe:/a:amazon:linux:nginx-mod-http-geoip

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: 8/7/2023

Vulnerability Publication Date: 5/25/2021

Reference Information

CVE: CVE-2021-23017

IAVB: 2021-B-0031