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Amazon Linux 2023 : awscli-2 (ALAS2023-2026-3133)
medium Nessus Plugin ID 351021
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Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3133 advisory.Mozilla blocked compromised intermediate eMudhra certificates via OneCRL on the 17th of October which was distributed to clients via RemoteSettings the same day. This update contains the updated OneCRL block list, ensuring clients will block the compromised certificates even if RemoteSettings is disabled by policy or otherwise unavailable in the user's network environment. This vulnerability was fixed in Firefox 158.0.1, Firefox ESR 153.5.1, and Firefox ESR 115.43.1.
The ca-certificates package contains the set of system-wide trusted Root CA certificates. The ca- certificates package is not itself vulnerable because it contains no compromised certificates, but it does include the eMudhra root CAs that signed the compromised intermediate certificates. Because those roots are trust anchors for the intermediates, Amazon Linux will remove the affected eMudhra root certificates from the package. After updating, certificates that chain to the removed roots will no longer be trusted.
This issue affects any application that uses the system-wide PKI certificates supplied by ca-certificates.
Customers are advised to update ca-certificates as soon as the fixed package is available.
(CVE-2026-113470)
Overly permissive file permissions in AWS CLI before 1.44.78 (v1) and 2.34.29 (v2) on Unix-like systems where the umask has not been configured to restrict file permissions (the default on most systems) may allow other local users on the same host to read credentials written by certain CLI subcommands (aws codeartifact login, aws iam create-virtual-mfa-device, aws deploy register).
To remediate this issue, users should upgrade to AWS CLI 1.44.78 (v1) or 2.34.29 (v2) or later.
(CVE-2026-13769)
Key exchange without entity authentication in the EMR SSH helper commands in Amazon AWS CLI before 1.45.28 and AWS CLI v2 before 2.35.3 might allow man-in-the-middle attackers to intercept SSHsessions and file transfers via network positioning between the client and the EMR cluster endpoint.
To remediate this issue, users should upgrade to AWS CLI v1 1.45.28 or later, or AWS CLI v2 2.35.3 or later. (CVE-2026-18654)
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 'dnf update awscli-2 --releasever 2023.12.20260928' or or 'dnf update --advisory ALAS2023-2026-3133 --releasever 2023.12.20260928' to update your system.See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3133.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2026-113470.html
Plugin Details
Severity: Medium
ID: 351021
File Name: al2023_ALAS2023-2026-3133.nasl
Version: 1.2
Type: Local
Agent: unix
Published: 9/29/2026
Updated: 11/5/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.1
Percentile: 95.56
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-2026-113470
CVSS v3
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5.9
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS Score Source: CVE-2026-18654
CVSS v4
Risk Factor: Medium
Base Score: 6.9
Threat Score: 2.4
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
CVSS Score Source: CVE-2026-18654
Vulnerability Information
CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:awscli-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: 9/29/2026
Vulnerability Publication Date: 7/1/2026