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Ubuntu Security Notice USN-4236-2
January 14, 2020

libgcrypt20 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- libgcrypt20: LGPL Crypto library

Details:

USN-4236-1 fixed a vulnerability in Libgcrypt. This update provides the
corresponding fix for Ubuntu 16.04 LTS.

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 16.04 LTS:
  libgcrypt20                     1.6.5-2ubuntu0.6

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

References:
  https://usn.ubuntu.com/4236-2
  https://usn.ubuntu.com/4236-1
  CVE-2019-13627

Package Information:
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.6.5-2ubuntu0.6