=========================================================================Ubuntu Security Notice USN-4491-1
September 09, 2020

gnutls28 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

GnuTLS could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- gnutls28: GNU TLS library

Details:

It was discovered that GnuTLS incorrectly handled certain alerts when being
used with TLS 1.3 servers. A remote attacker could use this issue to cause
GnuTLS to crash, resulting in a denial of service, or possibly execute
arbitrary code.

Update instructions:

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

Ubuntu 20.04 LTS:
  libgnutls30                     3.6.13-2ubuntu1.3

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

References:
  https://ubuntu.com/security/notices/USN-4491-1
  CVE-2020-24659

Package Information:
  https://launchpad.net/ubuntu/+source/gnutls28/3.6.13-2ubuntu1.3