Executive Summary

Title GnuTLS update
Name USN-4233-2 First vendor Publication 2020-01-23
Vendor Ubuntu Last vendor Modification 2020-01-23
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
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Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores


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:
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.


Package Information:

Original Source

Url : http://www.ubuntu.com/usn/USN-4233-2

Alert History

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Date Informations
2020-03-19 13:20:13
  • First insertion