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Amazon Linux 2023 : ruby3.2, ruby3.2-bundled-gems, ruby3.2-default-gems (ALAS2023-2025-1168)

medium Nessus Plugin ID 261745

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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 ALAS2023-2025-1168 advisory.

 Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a literal byte count, which is automatically read by the client's receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well- behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5. (CVE-2025-43857)

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 2023.8.20250908' or or 'dnf update --advisory ALAS2023-2025-1168 --releasever 2023.8.20250908' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2025-1168.html

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

https://explore.alas.aws.amazon.com/CVE-2025-43857.html

Plugin Details

Severity: Medium

ID: 261745

File Name: al2023_ALAS2023-2025-1168.nasl

Version: 1.1

Type: local

Agent: unix

Published: 9/8/2025

Updated: 9/8/2025

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2025-43857

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6

Threat Score: 2.3

Threat Vector: CVSS:4.0/E:U

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

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-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-libs, 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-bigdecimal, p-cpe:/a:amazon:linux:ruby3.2-debuginfo, 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-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: 9/8/2025

Vulnerability Publication Date: 4/28/2025

Reference Information

CVE: CVE-2025-43857