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Amazon Linux 2 : ecs-init, --advisory ALAS2ECS-2025-088 (ALASECS-2025-088)
medium Nessus Plugin ID 281796
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Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
The version of ecs-init installed on the remote host is prior to 1.101.1-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2ECS-2025-088 advisory.crypto/x509: excluded subdomain constraint does not restrict wildcard SANs
An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com. (CVE-2025-61727)
Within HostnameError.Error(), when constructing an error string, there is no limit to the number of hosts that will be printed out. Furthermore, the error string is constructed by repeated string concatenation, leading to quadratic runtime. Therefore, a certificate provided by a malicious actor can result in excessive resource consumption. (CVE-2025-61729)
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 ecs-init' or or 'yum update --advisory ALAS2ECS-2025-088' to update your system.See Also
https://alas.aws.amazon.com//AL2/ALAS2ECS-2025-088.html
https://alas.aws.amazon.com/faqs.html
Plugin Details
Severity: Medium
ID: 281796
File Name: al2_ALASECS-2025-088.nasl
Version: 1.1
Type: local
Agent: unix
Published: 1/5/2026
Updated: 1/5/2026
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.1
CVSS v2
Risk Factor: Medium
Base Score: 6.4
Temporal Score: 4.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N
CVSS Score Source: CVE-2025-61727
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:ecs-init, 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: 1/5/2026
Vulnerability Publication Date: 12/2/2025
Reference Information
CVE: CVE-2025-61727, CVE-2025-61729
IAVB: 2025-B-0194