[USN-3065-1] Libgcrypt vulnerability

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-3065-1
August 18, 2016

libgcrypt11, libgcrypt20 vulnerability
==========================================================================

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

- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Libgcrypt incorrectly generated random numbers.

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

Details:

Felix Dörre and Vladimir Klebanov discovered that Libgcrypt incorrectly
handled mixing functions in the random number generator. An attacker able
to obtain 4640 bits from the RNG can trivially predict the next 160 bits of
output.

Update instructions:

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

Ubuntu 16.04 LTS:
  libgcrypt20                     1.6.5-2ubuntu0.2

Ubuntu 14.04 LTS:
  libgcrypt11                     1.5.3-2ubuntu4.4

Ubuntu 12.04 LTS:
  libgcrypt11                     1.5.0-3ubuntu0.6

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

References:
  http://www.ubuntu.com/usn/usn-3065-1
  CVE-2016-6313

Package Information:
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.6.5-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.3-2ubuntu4.4
  https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.0-3ubuntu0.6


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