Debian dsa-6204 : openssh-client - security update

medium Nessus Plugin ID 307671

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6204 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6204-1 [email protected] https://www.debian.org/security/ Salvatore Bonaccorso April 09, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : openssh CVE ID : CVE-2026-3497 Debian Bug : 1130595

Jeremy Brown discovered a flaw in the GSSAPI Key Exchange patch applied in Debian to OpenSSH, an implementation of the SSH protocol suite, affecting non-default configurations with the GSSAPIKeyExchange setting enabled. A remote attacker can take advantage of this flaw to cause a denial of service, or potentially the execution of arbitrary code.

For the oldstable distribution (bookworm), this problem has been fixed in version 1:9.2p1-2+deb12u9. This update includes fixes for CVE-2025-61984 and CVE-2025-61985 which were queued for the Debian bookworm 12.14 point release.

For the stable distribution (trixie), this problem has been fixed in version 1:10.0p1-7+deb13u2.

We recommend that you upgrade your openssh packages.

For the detailed security status of openssh please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/openssh

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the openssh-client packages.

Plugin Details

Severity: Medium

ID: 307671

File Name: debian_DSA-6204.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 4/21/2026

Updated: 4/21/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-3497

CVSS v3

Risk Factor: Low

Base Score: 3.6

Temporal Score: 3.3

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

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

CVSS Score Source: CVE-2025-61985

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 5.5

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:openssh-client, p-cpe:/a:debian:debian_linux:openssh-client-udeb, p-cpe:/a:debian:debian_linux:openssh-server, p-cpe:/a:debian:debian_linux:openssh-server-udeb, p-cpe:/a:debian:debian_linux:openssh-sftp-server, p-cpe:/a:debian:debian_linux:ssh, p-cpe:/a:debian:debian_linux:ssh-askpass-gnome, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:openssh-tests, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:openssh-client-gssapi, p-cpe:/a:debian:debian_linux:openssh-server-gssapi

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/9/2026

Vulnerability Publication Date: 10/6/2025

Reference Information

CVE: CVE-2025-61984, CVE-2025-61985, CVE-2026-3497

IAVA: 2025-A-0729-S, 2025-A-0806-S

Detections

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