USN-1436-1: Libtasn1 vulnerability

2 May 2012

libtasn1-3 vulnerability

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

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


Libtasn1 could be made to crash or run programs as your login if it received specially crafted input.

Software Description

  • libtasn1-3 - Library to manage ASN.1 structures


Matthew Hall discovered that Libtasn1 incorrectly handled certain large values. An attacker could exploit this with a specially crafted ASN.1 structure and cause 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 12.04 LTS
libtasn1-3 - 2.10-1ubuntu1.1
Ubuntu 11.10
libtasn1-3 - 2.9-4ubuntu0.1
Ubuntu 11.04
libtasn1-3 - 2.7-1ubuntu1.1
Ubuntu 10.04 LTS
libtasn1-3 - 2.4-1ubuntu0.1
Ubuntu 8.04 LTS
libtasn1-3 - 1.1-1ubuntu0.1

To update your system, please follow these instructions:

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