USN-4233-2: GnuTLS update

USN-4233-2: GnuTLS update

gnutls28 update

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

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


USN-4233-1 marked SHA1 as untrusted in GnuTLS with no workaround.

Software Description

  • gnutls28 – GNU TLS library


USN-4233-1 disabled SHA1 being used for digital signature operations in
GnuTLS. In certain network environments, certificates using SHA1 may still
be in use. This update adds the %VERIFY_ALLOW_BROKEN and
%VERIFY_ALLOW_SIGN_WITH_SHA1 priority strings that can be used to
temporarily re-enable SHA1 until certificates can be replaced with a
stronger algorithm.

Original advisory details:

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
Ubuntu 16.04 LTS

To update your system, please follow these instructions:

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


Source: USN-4233-2: GnuTLS update

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