USN-4233-1: GnuTLS update

9 January 2020

gnutls28 update

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

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


SHA1 has been marked as untrusted in GnuTLS.

Software Description

  • gnutls28 - GNU TLS library


As a security improvement, this update marks SHA1 as being untrusted for digital signature operations.

Update instructions

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

Ubuntu 18.04 LTS
libgnutls30 - 3.5.18-1ubuntu1.2
Ubuntu 16.04 LTS
libgnutls30 - 3.4.10-4ubuntu1.6

To update your system, please follow these instructions:

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