=========================================================================Ubuntu Security Notice USN-3064-1
August 18, 2016

gnupg 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:

GnuPG incorrectly generated random numbers.

Software Description:
- gnupg: GNU privacy guard - a free PGP replacement

Details:

Felix Dörre and Vladimir Klebanov discovered that GnuPG 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:
  gnupg                           1.4.20-1ubuntu3.1

Ubuntu 14.04 LTS:
  gnupg                           1.4.16-1ubuntu2.4

Ubuntu 12.04 LTS:
  gnupg                           1.4.11-3ubuntu2.10

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

References:
  
  CVE-2016-6313

Package Information:
  https://launchpad.net/ubuntu/+source/gnupg/1.4.20-1ubuntu3.1
  https://launchpad.net/ubuntu/+source/gnupg/1.4.16-1ubuntu2.4
  https://launchpad.net/ubuntu/+source/gnupg/1.4.11-3ubuntu2.10