Executive Summary

Title Unbound vulnerability
Name USN-3673-1 First vendor Publication 2018-06-07
Vendor Ubuntu Last vendor Modification 2018-06-07
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
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:P/A:N)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


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

- Ubuntu 18.04 LTS - Ubuntu 17.10 - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS


A security issue was fixed in Unbound.

Software Description: - unbound: validating, recursive, caching DNS resolver


Ralph Dolmans and Karst Koymans discovered that Unbound did not properly handle certain NSEC records. An attacker could use this to to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick Unbound into accepting a NODATA proof.

Update instructions:

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

Ubuntu 18.04 LTS:
libunbound2 1.6.7-1ubuntu2.1
unbound 1.6.7-1ubuntu2.1

Ubuntu 17.10:
libunbound2 1.6.5-1ubuntu0.2
unbound 1.6.5-1ubuntu0.2

Ubuntu 16.04 LTS:
libunbound2 1.5.8-1ubuntu1.1
unbound 1.5.8-1ubuntu1.1

Ubuntu 14.04 LTS:
libunbound2 1.4.22-1ubuntu4.14.04.3
unbound 1.4.22-1ubuntu4.14.04.3

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


Package Information:

Original Source

Url : http://www.ubuntu.com/usn/USN-3673-1

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

Application 38
Os 4
Os 2

Nessus® Vulnerability Scanner

Date Description
2018-02-07 Name : The remote Fedora host is missing a security update.
File : fedora_2018-a10a19e06a.nasl - Type : ACT_GATHER_INFO
2018-01-31 Name : The remote Debian host is missing a security update.
File : debian_DLA-1264.nasl - Type : ACT_GATHER_INFO
2018-01-31 Name : The remote Fedora host is missing a security update.
File : fedora_2018-69316c5b7a.nasl - Type : ACT_GATHER_INFO
2018-01-22 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_8d3bae09fd2811e795f2005056925db4.nasl - Type : ACT_GATHER_INFO

Alert History

If you want to see full details history, please login or register.
Date Informations
2018-06-08 05:18:29
  • First insertion