USN-3309-1: Libtasn1 vulnerability

Ubuntu Security Notice USN-3309-1

5th June, 2017

libtasn1-6 vulnerability

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


Libtasn1 could be made to crash or run programs as your login if it opened a specially crafted file.

Software description

  • libtasn1-6 - Library to manage ASN.1 structures


Jakub Jirasek discovered that GnuTLS incorrectly handled certain
assignments files. If a user were tricked into processing a specially
crafted assignments file, a remote attacker could possibly execute arbirary

Update instructions

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

Ubuntu 17.04:
libtasn1-6 4.10-1ubuntu0.1
Ubuntu 16.10:
libtasn1-6 4.9-4ubuntu0.1
Ubuntu 16.04 LTS:
libtasn1-6 4.7-3ubuntu0.16.04.2
Ubuntu 14.04 LTS:
libtasn1-6 3.4-3ubuntu0.5

To update your system, please follow these instructions:

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