Detections
Analytics

TencentOS Server 3: openssh (TSSA-2026:1300)

medium Nessus Plugin ID 377890

Synopsis

The remote TencentOS Server 3 host is missing one or more security updates.

Description

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:1300 advisory.

 Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

 CVE-2026-59997:
 A flaw was found in OpenSSH. The internal-sftp component within sshd incorrectly processes command-line arguments, recognizing only the first nine. This limitation can prevent the application of intended security configurations for SFTP (SSH File Transfer Protocol) connections, potentially leading to a bypass of security properties.

 CVE-2026-59998:
 A flaw was found in OpenSSH. The sshd component has an undocumented security-relevant behavior where GSSAPIStrictAcceptorCheck has no value when the server is in a Windows Active Directory environment. This could lead to unintended information disclosure and impact data integrity.

 CVE-2026-60000:
 A flaw was found in OpenSSH's Secure Shell Daemon (sshd). This vulnerability allows a remote attacker to cause a denial of service by initiating an excessive number of authentication attempts. The issue arises from the mishandling of the MaxAuthTries setting specifically when using GSSAPIAuthentication, leading to resource exhaustion.

 CVE-2026-60001:
 A flaw was found in OpenSSH's SSH daemon (sshd). A remote attacker could exploit this vulnerability by repeatedly attempting authentication. The flaw allows the attacker to bypass the intended minimum authentication delay, which can facilitate brute-force attacks. This makes it easier for an attacker to guess valid credentials, potentially leading to unauthorized access or a denial of service.

 CVE-2026-73283:
 A flaw was found in OpenSSH's `sshd` component. The `restrict` keyword, designed to limit tunnel forwarding within the `authorized_keys` file, was not correctly enforced for tunnel forwarding. This issue could allow a local attacker to bypass intended security restrictions, potentially leading to unauthorized network access or resource usage through tunnels.

Tenable has extracted the preceding description block directly from the Tencent Linux 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 packages.

See Also

https://mirrors.tencent.com/tlinux/errata/tssa-20261300.xml

Plugin Details

Severity: Medium

ID: 377890

File Name: tencentos_TSSA_2026_1300.nasl

Version: 1.1

Type: Local

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

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-2026-59998

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: cpe:/o:tencent:tencentos_server:3, p-cpe:/a:tencent:tencentos_server:openssh

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/etc/os-release, Host/TencentOS/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 10/22/2026

Vulnerability Publication Date: 7/8/2026

Reference Information

CVE: CVE-2026-59997, CVE-2026-59998, CVE-2026-60000, CVE-2026-60001, CVE-2026-73283

IAVA: 2026-A-0691-S, 2026-A-0847-S