=========================================================================Ubuntu Security Notice USN-2957-2
May 02, 2016

libtasn1-6 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Libtasn1 could be made to hang if it processed specially crafted data.

Software Description:
- libtasn1-6: Library to manage ASN.1 structures

Details:

USN-2957-1 fixed a vulnerability in Libtasn1. This update provides the
corresponding update for Ubuntu 16.04 LTS.

Original advisory details:

 Pascal Cuoq and Miod Vallat discovered that Libtasn1 incorrectly handled
 certain malformed DER certificates. A remote attacker could possibly use
 this issue to cause applications using Libtasn1 to hang, resulting in a
 denial of service.

Update instructions:

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

Ubuntu 16.04 LTS:
  libtasn1-6                      4.7-3ubuntu0.16.04.1

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

References:
  https://ubuntu.com/security/notices/USN-2957-2
  https://ubuntu.com/security/notices/USN-2957-1
  CVE-2016-4008

Package Information:
  https://launchpad.net/ubuntu/+source/libtasn1-6/4.7-3ubuntu0.16.04.1