Ubuntu alert USN-4233-2 (gnutls28)

From:
             
 
Marc Deslauriers <marc.deslauriers@canonical.com> 
To:
             
 
"ubuntu-security-announce@lists.ubuntu.com" <ubuntu-security-announce@lists.ubuntu.com> 
Subject:
             
 
[USN-4233-2] GnuTLS update 
Date:
             
 
Thu, 23 Jan 2020 12:58:35 -0500
Message-ID:
             
 
<9577ce17-d705-4205-9751-c5aa4d734950@canonical.com>
==========================================================================
Ubuntu Security Notice USN-4233-2
January 23, 2020

gnutls28 update
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- gnutls28: GNU TLS library

Details:

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:
  libgnutls30                     3.5.18-1ubuntu1.3

Ubuntu 16.04 LTS:
  libgnutls30                     3.4.10-4ubuntu1.7

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

References:
  https://usn.ubuntu.com/4233-2
  https://usn.ubuntu.com/4233-1
  https://launchpad.net/bugs/1860656

Package Information:
  https://launchpad.net/ubuntu/+source/gnutls28/3.5.18-1ubu...
  https://launchpad.net/ubuntu/+source/gnutls28/3.4.10-4ubu...

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