=========================================================================Ubuntu Security Notice USN-2896-1
February 15, 2016

libgcrypt11, libgcrypt20 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- libgcrypt20: LGPL Crypto library
- libgcrypt11: LGPL Crypto library

Details:

Daniel Genkin, Lev Pachmanov, Itamar Pipman and Eran Tromer discovered
that Libgcrypt was susceptible to an attack via physical side channels. A
local attacker could use this attack to possibly recover private keys.

Update instructions:

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

Ubuntu 15.10:
  libgcrypt20                     1.6.3-2ubuntu1.1

Ubuntu 14.04 LTS:
  libgcrypt11                     1.5.3-2ubuntu4.3

Ubuntu 12.04 LTS:
  libgcrypt11                     1.5.0-3ubuntu0.5

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

References:
  https://ubuntu.com/security/notices/USN-2896-1
  CVE-2015-7511

Package Information:
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.6.3-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.3-2ubuntu4.3
  https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.0-3ubuntu0.5