Alibaba Cloud Linux 3 : 0161: openssh (ALINUX3-SA-2025:0161)

medium Nessus Plugin ID 270633

Synopsis

The remote Alibaba Cloud Linux host is missing one or more security updates.

Description

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2025:0161 advisory.

Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

CVE-2025-26465:
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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

Update the affected packages.

Plugin Details

Severity: Medium

ID: 270633

File Name: alinux3_sa_2025-0161.nasl

Version: 1.1

Type: local

Family: Alibaba Cloud Linux Local Security Checks

Published: 10/16/2025

Updated: 10/16/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.6

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

CVSS Score Source: CVE-2025-26465

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 6.1

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

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

Vulnerability Information

CPE: cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-cavs-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-ldap-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pam_ssh_agent_auth-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-askpass, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-askpass-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-cavs, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-clients, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-clients-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-debugsource, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-keycat, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-keycat-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-ldap, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-server, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:openssh-server-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pam_ssh_agent_auth

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/14/2025

Vulnerability Publication Date: 2/11/2025

Reference Information

CVE: CVE-2025-26465

Detections

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