Ubuntu 4233-2: GnuTLS update

    Date23 Jan 2020
    162
    Posted ByLinuxSecurity Advisories
    USN-4233-1 marked SHA1 as untrusted in GnuTLS with no workaround.
    ==========================================================================
    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/gnutls28/3.5.18-1ubuntu1.3
      https://launchpad.net/ubuntu/+source/gnutls28/3.4.10-4ubuntu1.7
    
    
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