=========================================================================Ubuntu Security Notice USN-2811-1
November 16, 2015

strongswan vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.10
- Ubuntu 15.04
- Ubuntu 14.04 LTS

Summary:

strongSwan could be made to bypass authentication.

Software Description:
- strongswan: IPsec VPN solution

Details:

It was discovered that the strongSwan eap-mschapv2 plugin incorrectly
handled state. A remote attacker could use this issue to bypass
authentication.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 15.10:
  strongswan-plugin-eap-mschapv2  5.1.2-0ubuntu6.2

Ubuntu 15.04:
  strongswan-plugin-eap-mschapv2  5.1.2-0ubuntu5.3

Ubuntu 14.04 LTS:
  strongswan-plugin-eap-mschapv2  5.1.2-0ubuntu2.4

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-2811-1
  CVE-2015-8023

Package Information:
  https://launchpad.net/ubuntu/+source/strongswan/5.1.2-0ubuntu6.2
  https://launchpad.net/ubuntu/+source/strongswan/5.1.2-0ubuntu5.3
  https://launchpad.net/ubuntu/+source/strongswan/5.1.2-0ubuntu2.4