=========================================================================Ubuntu Security Notice USN-3301-1
May 30, 2017

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

- Ubuntu 17.04
- Ubuntu 16.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

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

Software Description:
- strongswan: IPsec VPN solution

Details:

It was discovered that the strongSwan gmp plugin incorrectly validated RSA
public keys. A remote attacker could use this issue to cause strongSwan to
crash, resulting in a denial of service. (CVE-2017-9022)

It was discovered that strongSwan incorrectly parsed ASN.1 CHOICE types. A
remote attacker could use this issue to cause strongSwan to hang, resulting
in a denial of service. (CVE-2017-9023)

Update instructions:

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

Ubuntu 17.04:
  libstrongswan                   5.5.1-1ubuntu3.1
  strongswan                      5.5.1-1ubuntu3.1

Ubuntu 16.10:
  libstrongswan                   5.3.5-1ubuntu4.3
  strongswan                      5.3.5-1ubuntu4.3
  strongswan-plugin-gmp           5.3.5-1ubuntu4.3

Ubuntu 16.04 LTS:
  libstrongswan                   5.3.5-1ubuntu3.3
  strongswan                      5.3.5-1ubuntu3.3
  strongswan-plugin-gmp           5.3.5-1ubuntu3.3

Ubuntu 14.04 LTS:
  libstrongswan                   5.1.2-0ubuntu2.6
  strongswan                      5.1.2-0ubuntu2.6
  strongswan-plugin-gmp           5.1.2-0ubuntu2.6

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

References:
  https://ubuntu.com/security/notices/USN-3301-1
  CVE-2017-9022, CVE-2017-9023

Package Information:
  https://launchpad.net/ubuntu/+source/strongswan/5.5.1-1ubuntu3.1
  https://launchpad.net/ubuntu/+source/strongswan/5.3.5-1ubuntu4.3
  https://launchpad.net/ubuntu/+source/strongswan/5.3.5-1ubuntu3.3
  https://launchpad.net/ubuntu/+source/strongswan/5.1.2-0ubuntu2.6