Ubuntu alert USN-5080-2 (libgcrypt20)

From:
             
 
"Leonidas S. Barbosa" <leo.barbosa@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-5080-2] Libgcrypt vulnerabilities
Date:
             
 
Thu, 16 Sep 2021 14:08:26 -0300
Message-ID:
             
 
<20210916170826.GA3942209@d4rkl41n>
==========================================================================
Ubuntu Security Notice USN-5080-2
September 16, 2021

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

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

- Ubuntu 16.04 ESM

Summary:

Libgcrypt could be made to expose sensitive information.

Software Description:
- libgcrypt20: LGPL Crypto library

Details:

USN-5080-1 fixed several vulnerabilities in Libgcrypt. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory 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 16.04 ESM:
  libgcrypt20                     1.6.5-2ubuntu0.6+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5080-2
  https://ubuntu.com/security/notices/USN-5080-1
  CVE-2021-33560, CVE-2021-40528
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