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Debian dla-4512 : charon-cmd - security update

high Nessus Plugin ID 304020

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-4512 advisory.

 - ------------------------------------------------------------------------- Debian LTS Advisory DLA-4512-1 [email protected] https://www.debian.org/lts/security/ Thorsten Alteholz March 27, 2026 https://wiki.debian.org/LTS
 - -------------------------------------------------------------------------

 Package : strongswan Version : 5.9.1-1+deb11u6 CVE ID : CVE-2026-25075


 Kazuma Matsumoto discovered an integer overflow bug in the EAP-TTLS plugin of strongSwan, an IKE/IPsec suite.


 The EAP-TTLS plugin doesn't check the length field in the header of attribute-value pairs (AVPs) tunneled in EAP-TTLS, which can cause an integer underflow that may lead to a crash. An unauthenticated attacker could exploit this for a DoS attack by sending a crafted message.



 For Debian 11 bullseye, this problem has been fixed in version 5.9.1-1+deb11u6.

 We recommend that you upgrade your strongswan packages.

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

 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 charon-cmd packages.

See Also

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

https://security-tracker.debian.org/tracker/CVE-2026-25075

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

Plugin Details

Severity: High

ID: 304020

File Name: debian_DLA-4512.nasl

Version: 1.1

Type: local

Agent: unix

Published: 3/27/2026

Updated: 3/27/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-25075

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:strongswan-starter, p-cpe:/a:debian:debian_linux:strongswan-charon, p-cpe:/a:debian:debian_linux:charon-systemd, p-cpe:/a:debian:debian_linux:strongswan-scepclient, p-cpe:/a:debian:debian_linux:libcharon-extra-plugins, p-cpe:/a:debian:debian_linux:libstrongswan-standard-plugins, p-cpe:/a:debian:debian_linux:libstrongswan-extra-plugins, p-cpe:/a:debian:debian_linux:strongswan-nm, p-cpe:/a:debian:debian_linux:charon-cmd, p-cpe:/a:debian:debian_linux:strongswan-pki, p-cpe:/a:debian:debian_linux:strongswan-libcharon, p-cpe:/a:debian:debian_linux:libcharon-extauth-plugins, p-cpe:/a:debian:debian_linux:strongswan, p-cpe:/a:debian:debian_linux:libstrongswan, p-cpe:/a:debian:debian_linux:strongswan-swanctl

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/27/2026

Vulnerability Publication Date: 3/23/2026

Reference Information

CVE: CVE-2026-25075