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Amazon Linux 2023 : ruby3.2, ruby3.2-bundled-gems, ruby3.2-default-gems (ALAS2023-2025-1115)

medium Nessus Plugin ID 243482

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Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2025-1115 advisory.

 Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions.

 The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876. (CVE-2025-6442)

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 'dnf update ruby3.2 --releasever 2023.8.20250808' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2025-1115.html

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

https://explore.alas.aws.amazon.com/CVE-2025-6442.html

Plugin Details

Severity: Medium

ID: 243482

File Name: al2023_ALAS2023-2025-1115.nasl

Version: 1.2

Type: local

Agent: unix

Published: 8/4/2025

Updated: 8/14/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2025-6442

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:ruby3.2-libs-debuginfo, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:ruby3.2-rubygem-bigdecimal-debuginfo, p-cpe:/a:amazon:linux:ruby3.2-rubygem-io-console-debuginfo, p-cpe:/a:amazon:linux:ruby3.2-rubygems-devel, p-cpe:/a:amazon:linux:ruby3.2-rubygem-power_assert, p-cpe:/a:amazon:linux:ruby3.2, p-cpe:/a:amazon:linux:ruby3.2-rubygem-test-unit, p-cpe:/a:amazon:linux:ruby3.2-default-gems, p-cpe:/a:amazon:linux:ruby3.2-libs, p-cpe:/a:amazon:linux:ruby3.2-rubygem-rdoc, p-cpe:/a:amazon:linux:ruby3.2-rubygem-irb, p-cpe:/a:amazon:linux:ruby3.2-bundled-gems-debuginfo, p-cpe:/a:amazon:linux:ruby3.2-rubygem-json-debuginfo, p-cpe:/a:amazon:linux:ruby3.2-rubygem-minitest, p-cpe:/a:amazon:linux:ruby3.2-bundled-gems, p-cpe:/a:amazon:linux:ruby3.2-rubygem-bundler, p-cpe:/a:amazon:linux:ruby3.2-debugsource, p-cpe:/a:amazon:linux:ruby3.2-rubygem-psych, p-cpe:/a:amazon:linux:ruby3.2-rubygem-psych-debuginfo, p-cpe:/a:amazon:linux:ruby3.2-doc, p-cpe:/a:amazon:linux:ruby3.2-rubygem-rexml, p-cpe:/a:amazon:linux:ruby3.2-rubygem-json, p-cpe:/a:amazon:linux:ruby3.2-rubygem-io-console, p-cpe:/a:amazon:linux:ruby3.2-rubygem-rbs-debuginfo, p-cpe:/a:amazon:linux:ruby3.2-rubygem-rbs, p-cpe:/a:amazon:linux:ruby3.2-rubygem-rss, p-cpe:/a:amazon:linux:ruby3.2-rubygem-bigdecimal, p-cpe:/a:amazon:linux:ruby3.2-debuginfo, p-cpe:/a:amazon:linux:ruby3.2-rubygem-rake, p-cpe:/a:amazon:linux:ruby3.2-rubygem-typeprof, p-cpe:/a:amazon:linux:ruby3.2-rubygems, p-cpe:/a:amazon:linux:ruby3.2-devel

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/4/2025

Vulnerability Publication Date: 6/25/2025

Reference Information

CVE: CVE-2025-6442