Amazon Linux 2 : amazon-ssm-agent, --advisory ALAS2-2025-3010 (ALAS-2025-3010)

medium Nessus Plugin ID 266165

Language:

Synopsis

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

Description

The version of amazon-ssm-agent installed on the remote host is prior to 3.3.3050.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-3010 advisory.

The net/http package accepted data in the chunked transfer encoding containing an invalid chunk-size line terminated by a bare LF. When used in conjunction with a server or proxy which incorrectly interprets a bare LF in a chunk extension as part of the extension, this could permit request smuggling.
(CVE-2025-22871)

The tokenizer incorrectly interprets tags with unquoted attribute values that end with a solidus character (/) as self-closing. When directly using Tokenizer, this can result in such tags incorrectly being marked as self-closing, and when using the Parse functions, this can result in content following such tags as being placed in the wrong scope during DOM construction, but only when tags are in foreign content (e.g.
<math>, <svg>, etc contexts).

After analysis, we have determined that 2025-22872 do not pose a security risk to docker or containerd on Amazon Linux 2 or Amazon Linux 2023. Source code analysis using govulncheck has confirmed that these packages do not contain the vulnerable code. As a result, no security patches are required for these specific packages on AL2 and AL2023. (CVE-2025-22872)

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

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

Solution

Run 'yum update amazon-ssm-agent' or or 'yum update --advisory ALAS2-2025-3010' to update your system.

Plugin Details

Severity: Medium

ID: 266165

File Name: al2_ALAS-2025-3010.nasl

Version: 1.1

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 9/30/2025

Updated: 9/30/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2025-22871

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 1.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS Score Source: CVE-2025-22872

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:amazon-ssm-agent

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/29/2025

Vulnerability Publication Date: 3/27/2025

Reference Information

CVE: CVE-2025-22871, CVE-2025-22872

IAVB: 2025-B-0042-S, 2025-B-0048-S

Detections

Analytics