USN-3193-1: Nettle vulnerability

6 February 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


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

Software Description

  • nettle - low level cryptographic library (public-key cryptos)


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

To update your system, please follow these instructions:

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