USN-2957-1: Libtasn1 vulnerability

Ubuntu Security Notice USN-2957-1

2nd May, 2016

libtasn1-3, libtasn1-6 vulnerability

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

  • Ubuntu 15.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

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

Software description

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

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

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 version:

Ubuntu 15.10:
libtasn1-6

4.5-2ubuntu0.1
Ubuntu 14.04 LTS:
libtasn1-6

3.4-3ubuntu0.4
Ubuntu 12.04 LTS:
libtasn1-3

2.10-1ubuntu1.5

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2016-4008

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