Executive Summary

Title Bind vulnerabilities
Name USN-4365-2 First vendor Publication 2020-05-20
Vendor Ubuntu Last vendor Modification 2020-05-20
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Overall CVSS Score 8.6
Base Score 8.6 Environmental Score 8.6
impact SubScore 4 Temporal Score 8.6
Exploitabality Sub Score 3.9
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Changed Confidentiality Impact None
Integrity Impact None Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:P)
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 14.04 ESM - Ubuntu 12.04 ESM


Several security issues were fixed in Bind.

Software Description: - bind9: Internet Domain Name Server


USN-4365-1 fixed several vulnerabilities in Bind. This update provides the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM. Original advisory details:

Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Bind
incorrectly limited certain fetches. A remote attacker could possibly use
this issue to cause Bind to consume resources, leading to a denial of
service, or possibly use Bind to perform a reflection attack.

Tobias Klein discovered that Bind incorrectly handled checking TSIG
validity. A remote attacker could use this issue to cause Bind to crash,
resulting in a denial of service, or possibly perform other attacks.

Update instructions:

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

Ubuntu 14.04 ESM:
bind9 1:9.9.5.dfsg-3ubuntu0.19+esm2

Ubuntu 12.04 ESM:
bind9 1:9.8.1.dfsg.P1-4ubuntu0.30

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

CVE-2020-8616, CVE-2020-8617

Original Source

Url : http://www.ubuntu.com/usn/USN-4365-2

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-617 Reachable Assertion
50 % CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')

CPE : Common Platform Enumeration

Application 651
Os 2

Snort® IPS/IDS

Date Description
2020-09-02 BIND DNS server TSIG denial of service attempt
RuleID : 54630 - Revision : 1 - Type : PROTOCOL-DNS

Alert History

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Date Informations
2020-05-28 05:28:31
  • Multiple Updates
2020-05-21 00:18:07
  • First insertion