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