Debian DSA-5056-1 : strongswan - security update

critical Nessus Plugin ID 157253

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Synopsis

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

Description

The remote Debian 10 / 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-5056 advisory.

Zhuowei Zhang discovered a bug in the EAP authentication client code of strongSwan, an IKE/IPsec suite, that may allow to bypass the client and in some scenarios even the server authentication, or could lead to a denial-of-service attack. When using EAP authentication (RFC 3748), the successful completion of the authentication is indicated by an EAP-Success message sent by the server to the client. strongSwan's EAP client code handled early EAP-Success messages incorrectly, either crashing the IKE daemon or concluding the EAP method prematurely. End result depend on the used configuration, more details can be found in upstream advisory at https://www.strongswan.org/blog/2022/01/24/strongswan- vulnerability-(cve-2021-45079).html For the oldstable distribution (buster), this problem has been fixed in version 5.7.2-1+deb10u2. For the stable distribution (bullseye), this problem has been fixed in version 5.9.1-1+deb11u2. 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

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 strongswan packages.

For the stable distribution (bullseye), this problem has been fixed in version 5.9.1-1+deb11u2.

Plugin Details

Severity: Critical

ID: 157253

File Name: debian_DSA-5056.nasl

Version: 1.4

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 1/31/2022

Updated: 1/24/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2021-45079

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

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, cpe:/o:debian:debian_linux:10.0, 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: 1/24/2022

Vulnerability Publication Date: 1/25/2022

Reference Information

CVE: CVE-2021-45079

Detections

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