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Amazon Linux 2 : perl-YAML-Syck, --advisory ALAS2-2025-3049 (ALAS-2025-3049)

medium Nessus Plugin ID 271747

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Synopsis

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

Description

The version of perl-YAML-Syck installed on the remote host is prior to 1.27-3. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2025-3049 advisory.

 YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure

 Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read

 The issue is seen with complex YAML files with a hash of all keys and empty values. There is no indication that the issue leads to accessing memory outside that allocated to the module. (CVE-2025-11683)

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 perl-YAML-Syck' or or 'yum update --advisory ALAS2-2025-3049' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2025-3049.html

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

https://explore.alas.aws.amazon.com/CVE-2025-11683.html

Plugin Details

Severity: Medium

ID: 271747

File Name: al2_ALAS-2025-3049.nasl

Version: 1.1

Type: local

Agent: unix

Published: 10/28/2025

Updated: 10/28/2025

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, 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:A/AC:L/Au:N/C:C/I:N/A:N

CVSS Score Source: CVE-2025-11683

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:perl-yaml-syck, p-cpe:/a:amazon:linux:perl-yaml-syck-debuginfo, cpe:/o:amazon:linux:2

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/27/2025

Vulnerability Publication Date: 10/16/2025

Reference Information

CVE: CVE-2025-11683