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Amazon Linux 2023 : libnetapi, libnetapi-devel, libsmbclient (ALAS2023-2026-1899)

medium Nessus Plugin ID 327377

Synopsis

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

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1899 advisory.

 If the certificate auto-enrollment GPO is enabled on domain members(both in Samba's smb.conf and using Windows GPME tool), a CAcertificate may be fetched using a plain HTTP connection and installedin the member computer's trust store. This may give an attacker achance to intercept the response, installing their chosen certificateinstead.

 The URL from which the certificate is fetched follows a pattern usedby Microsoft's Network Device Enrollment Service (NDES) to providecertificates to computers on the network that are not full domainmembers. Domain members should already have access to thesecertificates via better protected LDAP connections, so do not need theNDES link (Samba uses no other part of NDES).

 Pure Samba domains will not have auto-enrolment available, eitherthrough LDAP or HTTP, as Samba does not currently implement ActiveDirectory Certificate Services. However, members of these domains arestill vulnerable if the GPO is enabled.

 The patch removes the attempt to download the certificate and relieson the LDAP values. (CVE-2026-3012)

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 samba --releasever 2023.12.20260706' or or 'dnf update --advisory ALAS2023-2026-1899 --releasever 2023.12.20260706' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1899.html

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

https://explore.alas.aws.amazon.com/CVE-2026-3012.html

Plugin Details

Severity: Medium

ID: 327377

File Name: al2023_ALAS2023-2026-1899.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/16/2026

Updated: 7/16/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.64

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2026-3012

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libsmbclient, p-cpe:/a:amazon:linux:samba, p-cpe:/a:amazon:linux:samba-pidl, p-cpe:/a:amazon:linux:libsmbclient-debuginfo, p-cpe:/a:amazon:linux:libwbclient, p-cpe:/a:amazon:linux:samba-common-libs, p-cpe:/a:amazon:linux:samba-dcerpc, p-cpe:/a:amazon:linux:samba-libs, p-cpe:/a:amazon:linux:samba-test-libs-debuginfo, p-cpe:/a:amazon:linux:samba-usershares, p-cpe:/a:amazon:linux:samba-vfs-iouring, p-cpe:/a:amazon:linux:samba-winbind-krb5-locator, p-cpe:/a:amazon:linux:samba-common-tools-debuginfo, p-cpe:/a:amazon:linux:samba-debugsource, p-cpe:/a:amazon:linux:samba-test, p-cpe:/a:amazon:linux:samba-client-libs, p-cpe:/a:amazon:linux:samba-client-debuginfo, p-cpe:/a:amazon:linux:libnetapi-debuginfo, p-cpe:/a:amazon:linux:samba-winbind-krb5-locator-debuginfo, p-cpe:/a:amazon:linux:samba-test-libs, p-cpe:/a:amazon:linux:samba-winbind-debuginfo, p-cpe:/a:amazon:linux:libnetapi, p-cpe:/a:amazon:linux:libwbclient-debuginfo, p-cpe:/a:amazon:linux:samba-ldb-ldap-modules-debuginfo, p-cpe:/a:amazon:linux:libwbclient-devel, p-cpe:/a:amazon:linux:samba-winbind-clients, p-cpe:/a:amazon:linux:samba-common-libs-debuginfo, p-cpe:/a:amazon:linux:samba-ldb-ldap-modules, p-cpe:/a:amazon:linux:samba-client-libs-debuginfo, p-cpe:/a:amazon:linux:samba-winbind-clients-debuginfo, p-cpe:/a:amazon:linux:python3-samba-debuginfo, p-cpe:/a:amazon:linux:samba-tools, p-cpe:/a:amazon:linux:samba-krb5-printing, p-cpe:/a:amazon:linux:samba-libs-debuginfo, p-cpe:/a:amazon:linux:samba-dcerpc-debuginfo, p-cpe:/a:amazon:linux:samba-vfs-iouring-debuginfo, p-cpe:/a:amazon:linux:samba-winbind, p-cpe:/a:amazon:linux:samba-debuginfo, p-cpe:/a:amazon:linux:python3-samba, p-cpe:/a:amazon:linux:samba-winbind-modules-debuginfo, p-cpe:/a:amazon:linux:samba-dc-libs-debuginfo, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:samba-client, p-cpe:/a:amazon:linux:python3-samba-test, p-cpe:/a:amazon:linux:samba-common-tools, p-cpe:/a:amazon:linux:samba-devel, p-cpe:/a:amazon:linux:samba-common, p-cpe:/a:amazon:linux:libsmbclient-devel, p-cpe:/a:amazon:linux:libnetapi-devel, p-cpe:/a:amazon:linux:python3-samba-dc-debuginfo, p-cpe:/a:amazon:linux:samba-dc-libs, p-cpe:/a:amazon:linux:python3-samba-dc, p-cpe:/a:amazon:linux:samba-krb5-printing-debuginfo, p-cpe:/a:amazon:linux:samba-winbind-modules, p-cpe:/a:amazon:linux:samba-test-debuginfo, p-cpe:/a:amazon:linux:python3-samba-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: 7/7/2026

Vulnerability Publication Date: 5/27/2026

Reference Information

CVE: CVE-2026-3012

IAVA: 2026-A-0510