=========================================================================Ubuntu Security Notice USN-3193-1
February 06, 2017

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

- Ubuntu 16.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

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

Software Description:
- nettle: low level cryptographic library (public-key cryptos)

Details:

It was discovered that Nettle incorrectly mitigated certain timing
side-channel attacks. A remote attacker could possibly use this flaw to
recover private keys.

Update instructions:

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

Ubuntu 16.10:
  libnettle6                      3.2-1ubuntu0.16.10.1

Ubuntu 16.04 LTS:
  libnettle6                      3.2-1ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  libnettle4                      2.7.1-1ubuntu0.2

Ubuntu 12.04 LTS:
  libnettle4                      2.4-1ubuntu0.1

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

References:
  https://ubuntu.com/security/notices/USN-3193-1
  CVE-2016-6489

Package Information:
  https://launchpad.net/ubuntu/+source/nettle/3.2-1ubuntu0.16.10.1
  https://launchpad.net/ubuntu/+source/nettle/3.2-1ubuntu0.16.04.1
  https://launchpad.net/ubuntu/+source/nettle/2.7.1-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/nettle/2.4-1ubuntu0.1