USN-3774-1: strongSwan vulnerability

1 October 2018

strongswan vulnerability

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

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


strongSwan could be made to crash or run programs if it received specially crafted network traffic.

Software Description

  • strongswan - IPsec VPN solution


It was discovered that strongSwan incorrectly handled signature validation in the gmp plugin. A remote attacker could use this issue to cause strongSwan to crash, resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 18.04 LTS
libstrongswan - 5.6.2-1ubuntu2.3
strongswan - 5.6.2-1ubuntu2.3
Ubuntu 16.04 LTS
libstrongswan - 5.3.5-1ubuntu3.8
strongswan - 5.3.5-1ubuntu3.8
Ubuntu 14.04 LTS
libstrongswan - 5.1.2-0ubuntu2.11
strongswan - 5.1.2-0ubuntu2.11

To update your system, please follow these instructions:

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