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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://www.ubuntu.com/usn/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

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