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Debian dla-4535 : openssh-client - security update

medium Nessus Plugin ID 307622

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4535 advisory.

 - ------------------------------------------------------------------------- Debian LTS Advisory DLA-4535-1 [email protected] https://www.debian.org/lts/security/ Emilio Pozuelo Monfort April 16, 2026 https://wiki.debian.org/LTS
 - -------------------------------------------------------------------------

 Package : openssh Version : 1:8.4p1-5+deb11u6 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 Debian 11 bullseye, this problem has been fixed in version 1:8.4p1-5+deb11u6.

 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 LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the openssh-client packages.

See Also

https://security-tracker.debian.org/tracker/source-package/openssh

https://security-tracker.debian.org/tracker/CVE-2026-3497

https://packages.debian.org/source/bullseye/openssh

Plugin Details

Severity: Medium

ID: 307622

File Name: debian_DLA-4535.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/20/2026

Updated: 4/20/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-3497

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 2.7

Threat Vector: CVSS:4.0/E:U

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:ssh-askpass-gnome, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:openssh-server-udeb, p-cpe:/a:debian:debian_linux:ssh, p-cpe:/a:debian:debian_linux:openssh-sftp-server, p-cpe:/a:debian:debian_linux:openssh-server, p-cpe:/a:debian:debian_linux:openssh-tests, p-cpe:/a:debian:debian_linux:openssh-client, p-cpe:/a:debian:debian_linux:openssh-client-udeb

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/16/2026

Vulnerability Publication Date: 3/12/2026

Reference Information

CVE: CVE-2026-3497