[USN-3689-1] Libgcrypt vulnerability

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-3689-1
June 19, 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

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- libgcrypt20: LGPL Crypto library
- libgcrypt11: LGPL Crypto library

Details:

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

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

References:
  https://usn.ubuntu.com/usn/usn-3689-1
  CVE-2018-0495

Package Information:
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.8.1-4ubuntu1.1
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.7.8-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.6.5-2ubuntu0.5
  https://launchpad.net/ubuntu/+source/libgcrypt11/1.5.3-2ubuntu4.6

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