Ubuntu Security Notice USN-4491-1
September 09, 2020
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.04 LTS
GnuTLS could be made to crash or run programs if it received specially
crafted network traffic.
– gnutls28: GNU TLS library
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
The problem can be corrected by updating your system to the following
Ubuntu 20.04 LTS:
In general, a standard system update will make all the necessary changes.