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EulerOS Virtualization 2.15.0 : samba (EulerOS-SA-2026-4853)

critical Nessus Plugin ID 377228

Synopsis

The remote EulerOS Virtualization host is missing multiple security updates.

Description

According to the versions of the samba packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

 A flaw was found in Samba's certificate auto-enrollment Group Policy handling. When certificate auto- enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.(CVE-2026-3012)

 A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the 'check password script' feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the 'check password script' is used with %u and the samba-dcerpcd service is started as a system service.(CVE-2026-4408)

 A flaw was found in the Samba printing subsystem. Samba passes the client-controlled job description string to the command configured with the 'print command' setting via the '%J' substitution character without escaping shell meta characters. A remote attacker could exploit this vulnerability by sending a specially crafted print job description that contains unescaped shell characters. This could lead to remote code execution on the affected system.(CVE-2026-4480)

 A flaw was found in Sambas WINS server component when running as an Active Directory Domain Controller.
 The WINS protocol handlers for certain request types did not properly validate incoming packets, allowing an unauthenticated remote attacker to trigger a NULL pointer dereference and crash the WINS service using specially crafted UDP packets.(CVE-2026-3238)

 A flaw was found in samba's pam_winbind. When mkhomedir is enabled, pam_winbind chowns the target account's home directory without validating the path is not a critical system directory such as /. On affected systems, accounts with / as their home directory (a common default for system accounts) can have this triggered not only by root, but by a non-root user holding a narrow sudo delegation to run commands as that account, causing ownership of / to change and resulting in severe denial of service (SSH, sudo, and package-manager failures). The change does not grant write access to / (which ships with restrictive 0555 permissions on RHEL), so the impact is availability loss rather than further privilege escalation.(CVE-2026-15779)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization samba 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

Update the affected samba packages.

See Also

http://www.nessus.org/u?26d2c245

Plugin Details

Severity: Critical

ID: 377228

File Name: EulerOS_SA-2026-4853.nasl

Version: 1.1

Type: Local

Published: 11/7/2026

Updated: 11/7/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.34

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

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

CVSS Score Source: CVE-2026-4480

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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

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

Vulnerability Information

CPE: cpe:/o:huawei:euleros:uvp:2.15.0, p-cpe:/a:huawei:euleros:libsmbclient, p-cpe:/a:huawei:euleros:libwbclient, p-cpe:/a:huawei:euleros:samba-client-libs, p-cpe:/a:huawei:euleros:samba-common-tools, p-cpe:/a:huawei:euleros:samba-common, p-cpe:/a:huawei:euleros:samba-libs

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/uvp_version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/6/2026

Vulnerability Publication Date: 5/26/2026

Reference Information

CVE: CVE-2026-15779, CVE-2026-3012, CVE-2026-3238, CVE-2026-4408, CVE-2026-4480