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CBL Mariner 2.0 Security Update: openssh (CVE-2025-26465)

medium Nessus Plugin ID 216894

Synopsis

The remote CBL Mariner host is missing one or more security updates.

Description

The version of openssh installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-26465 advisory.

 - 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. (CVE-2025-26465)

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.

See Also

https://nvd.nist.gov/vuln/detail/CVE-2025-26465

Plugin Details

Severity: Medium

ID: 216894

File Name: mariner_CVE-2025-26465.nasl

Version: 1.1

Type: local

Published: 2/27/2025

Updated: 2/27/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.3

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: p-cpe:/a:microsoft:cbl-mariner:openssh, x-cpe:/o:microsoft:cbl-mariner, p-cpe:/a:microsoft:cbl-mariner:openssh-server, p-cpe:/a:microsoft:cbl-mariner:openssh-debuginfo, p-cpe:/a:microsoft:cbl-mariner:pam_ssh_agent_auth, p-cpe:/a:microsoft:cbl-mariner:openssh-clients

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/11/2025

Vulnerability Publication Date: 2/11/2025

Reference Information

CVE: CVE-2025-26465

IAVA: 2025-A-0126