USN-3417-1: Libgcrypt vulnerability

Ubuntu Security Notice USN-3417-1

14th September, 2017

libgcrypt20 vulnerability

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

  • Ubuntu 17.04


Libgcrypt could be made to expose sensitive information.

Software description

  • libgcrypt20 - LGPL Crypto library


Daniel Genkin, Luke Valenta, and Yuval Yarom discovered that Libgcrypt was
susceptible to an attack via side channels. A local attacker could use this
attack to recover Curve25519 private keys.

Update instructions

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

Ubuntu 17.04:
libgcrypt20 1.7.6-1ubuntu0.2

To update your system, please follow these instructions:

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