Debian DLA-345-1 : strongswan security update

medium Nessus Plugin ID 86953


The remote Debian host is missing a security update.


Tobias Brunner found an authentication bypass vulnerability in strongSwan, an IKE/IPsec suite.

Due to insufficient validation of its local state the server implementation of the EAP-MSCHAPv2 protocol in the eap-mschapv2 plugin can be tricked into successfully concluding the authentication without providing valid credentials.

It's possible to recognize such attacks by looking at the server logs.
The following log message would be seen during the client authentication :

EAP method EAP_MSCHAPV2 succeeded, no MSK established

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Upgrade the affected packages.

See Also

Plugin Details

Severity: Medium

ID: 86953

File Name: debian_DLA-345.nasl

Version: 2.6

Type: local

Agent: unix

Published: 11/20/2015

Updated: 1/11/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent

Risk Information


Risk Factor: Low

Score: 3.4


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libstrongswan, p-cpe:/a:debian:debian_linux:strongswan, p-cpe:/a:debian:debian_linux:strongswan-dbg, p-cpe:/a:debian:debian_linux:strongswan-ikev1, p-cpe:/a:debian:debian_linux:strongswan-ikev2, p-cpe:/a:debian:debian_linux:strongswan-nm, p-cpe:/a:debian:debian_linux:strongswan-starter, cpe:/o:debian:debian_linux:6.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/19/2015

Reference Information

CVE: CVE-2015-8023