USN-3689-1: Libgcrypt vulnerability

19 June 2018

libgcrypt11, libgcrypt20 vulnerability

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

  • Ubuntu 18.04 LTS
  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Libgcrypt could be made to expose sensitive information.

Software Description

  • libgcrypt20 - LGPL Crypto library
  • libgcrypt11 - LGPL Crypto library


Keegan Ryan discovered that Libgcrypt was susceptible to a side-channel attack. A local attacker could possibly use this attack to recover ECDSA private keys.

Update instructions

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

Ubuntu 18.04 LTS
libgcrypt20 - 1.8.1-4ubuntu1.1
Ubuntu 17.10
libgcrypt20 - 1.7.8-2ubuntu1.1
Ubuntu 16.04 LTS
libgcrypt20 - 1.6.5-2ubuntu0.5
Ubuntu 14.04 LTS
libgcrypt11 - 1.5.3-2ubuntu4.6

To update your system, please follow these instructions:

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