Debian DSA-3398-1 : strongswan - security update

medium Nessus Plugin ID 86888


The remote Debian host is missing a security-related 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


Upgrade the strongswan packages.

For the oldstable distribution (wheezy), this problem has been fixed in version 4.5.2-1.5+deb7u8.

For the stable distribution (jessie), this problem has been fixed in version 5.2.1-6+deb8u2.

See Also

Plugin Details

Severity: Medium

ID: 86888

File Name: debian_DSA-3398.nasl

Version: 2.7

Type: local

Agent: unix

Published: 11/17/2015

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:strongswan, cpe:/o:debian:debian_linux:7.0, cpe:/o:debian:debian_linux:8.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/16/2015

Reference Information

CVE: CVE-2015-8023

DSA: 3398