[USN-5080-1] Libgcrypt vulnerabilities

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-5080-1
September 16, 2021

libgcrypt20 vulnerabilities
==========================================================================

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

- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- libgcrypt20: LGPL Crypto library

Details:

It was discovered that Libgcrypt incorrectly handled ElGamal encryption. An
attacker could possibly use this issue to recover sensitive information.

Update instructions:

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

Ubuntu 21.04:
  libgcrypt20                     1.8.7-2ubuntu2.1

Ubuntu 20.04 LTS:
  libgcrypt20                     1.8.5-5ubuntu1.1

Ubuntu 18.04 LTS:
  libgcrypt20                     1.8.1-4ubuntu1.3

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

References:
  https://ubuntu.com/security/notices/USN-5080-1
  CVE-2021-33560, CVE-2021-40528

Package Information:
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.8.7-2ubuntu2.1
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.8.5-5ubuntu1.1
  https://launchpad.net/ubuntu/+source/libgcrypt20/1.8.1-4ubuntu1.3

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