N/A - USN-2821-1

Executive Summary

Summary
Title	GnuTLS vulnerability

Informations
Name	USN-2821-1	First vendor Publication	2015-11-30
Vendor	Ubuntu	Last vendor Modification	2015-11-30
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score	Not Defined	Attack Range	Not Defined
Cvss Impact Score	Not Defined	Attack Complexity	Not Defined
Cvss Expoit Score	Not Defined	Authentication	Not Defined
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 14.04 LTS - Ubuntu 12.04 LTS

Summary:

GnuTLS could be made to expose sensitive information over the network.

Software Description: - gnutls26: GNU TLS library

Details:

It was discovered that GnuTLS incorrectly validated the first byte of padding in CBC modes. A remote attacker could possibly use this issue to perform a padding oracle attack.

Update instructions:

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

Ubuntu 14.04 LTS:
libgnutls26 2.12.23-12ubuntu2.3

Ubuntu 12.04 LTS:
libgnutls26 2.12.14-5ubuntu3.10

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

References:
http://www.ubuntu.com/usn/usn-2821-1
https://launchpad.net/bugs/1510163

Package Information:
https://launchpad.net/ubuntu/+source/gnutls26/2.12.23-12ubuntu2.3
https://launchpad.net/ubuntu/+source/gnutls26/2.12.14-5ubuntu3.10