USN-3733-1: GnuPG vulnerability

7 August 2018

gnupg vulnerability

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

  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


GnuPG could be made to expose sensitive information.

Software Description

  • gnupg - GNU privacy guard - a free PGP replacement


Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal, and Yuval Yarom discovered that GnuPG is vulnerable to a cache side-channel attack. A local attacker could use this attack to recover RSA private keys.

Update instructions

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

Ubuntu 16.04 LTS
gnupg - 1.4.20-1ubuntu3.3
gnupg-curl - 1.4.20-1ubuntu3.3
gpgv - 1.4.20-1ubuntu3.3
Ubuntu 14.04 LTS
gnupg - 1.4.16-1ubuntu2.6
gnupg-curl - 1.4.16-1ubuntu2.6
gpgv - 1.4.16-1ubuntu2.6

To update your system, please follow these instructions:

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