Debian dla-4238 : sslh - security update

critical Nessus Plugin ID 241668

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Synopsis

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

Description

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4238 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4238-1 [email protected] https://www.debian.org/lts/security/ Chris Lamb July 09, 2025 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : sslh Version : 1.20-1+deb11u1 CVE ID : CVE-2025-52936 Debian Bug : 1108284

It was discovered that there was a so-called link following vulnerability in sslh, a protocol multiplexor often used to share SSH and HTTPS on the same port.

For Debian 11 bullseye, this problem has been fixed in version 1.20-1+deb11u1.

We recommend that you upgrade your sslh packages.

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

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 sslh packages.

Plugin Details

Severity: Critical

ID: 241668

File Name: debian_DLA-4238.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 7/9/2025

Updated: 7/9/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

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-2025-52936

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 7.3

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:sslh

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/9/2025

Vulnerability Publication Date: 6/23/2025

Reference Information

CVE: CVE-2025-52936

Detections

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