Ubuntu alert USN-2865-1 (gnutls26, gnutls28)

From:
    	     
 
Marc Deslauriers <marc.deslauriers@canonical.com> 
To:
    	     
 
ubuntu-security-announce@lists.ubuntu.com 
Subject:
    	     
 
[USN-2865-1] GnuTLS vulnerability 
Date:
    	     
 
Fri, 8 Jan 2016 08:23:24 -0500
Message-ID:
    	     
 
<568FB84C.7050100@canonical.com>
==========================================================================
Ubuntu Security Notice USN-2865-1
January 08, 2016

gnutls26, gnutls28 vulnerability
==========================================================================

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

- Ubuntu 15.04
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

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

Software Description:
- gnutls28: GNU TLS library
- gnutls26: GNU TLS library

Details:

Karthikeyan Bhargavan and Gaetan Leurent discovered that GnuTLS incorrectly
allowed MD5 to be used for TLS 1.2 connections. If a remote attacker were
able to perform a man-in-the-middle attack, this flaw could be exploited to
view sensitive information.

Update instructions:

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

Ubuntu 15.04:
  libgnutls-deb0-28               3.3.8-3ubuntu3.2
  libgnutls-openssl27             3.3.8-3ubuntu3.2
  libgnutlsxx28                   3.3.8-3ubuntu3.2

Ubuntu 14.04 LTS:
  libgnutls-openssl27             2.12.23-12ubuntu2.4
  libgnutls26                     2.12.23-12ubuntu2.4
  libgnutlsxx27                   2.12.23-12ubuntu2.4

Ubuntu 12.04 LTS:
  libgnutls-openssl27             2.12.14-5ubuntu3.11
  libgnutls26                     2.12.14-5ubuntu3.11
  libgnutlsxx27                   2.12.14-5ubuntu3.11

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

References:
  http://www.ubuntu.com/usn/usn-2865-1

  CVE-2015-7575

Package Information:
  https://launchpad.net/ubuntu/+source/gnutls28/3.3.8-3ubun...
  https://launchpad.net/ubuntu/+source/gnutls26/2.12.23-12u...
  https://launchpad.net/ubuntu/+source/gnutls26/2.12.14-5ub...


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