A Libgcrypt security update has been released for Ubuntu Linux 14.04 ESM and 12.04 ESM.

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Ubuntu Security Notice USN-4236-3
January 28, 2020

libgcrypt11 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- libgcrypt11: LGPL Crypto library

Details:

USN-4236-1 fixed a vulnerability in Libgcrypt. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that Libgcrypt was susceptible to a ECDSA timing attack.
An attacker could possibly use this attack to recover sensitive
information.

Update instructions:

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

Ubuntu 14.04 ESM:
libgcrypt11 1.5.3-2ubuntu4.6+esm1

Ubuntu 12.04 ESM:
libgcrypt11 1.5.0-3ubuntu0.9

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

References:
https://usn.ubuntu.com/4236-3
https://usn.ubuntu.com/4236-1
CVE-2019-13627