USN-4365-1: Bind vulnerabilities

19 May 2020

bind9 vulnerabilities

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

  • Ubuntu 20.04 LTS
  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


Several security issues were fixed in Bind.

Software Description

  • bind9 - Internet Domain Name Server


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. (CVE-2020-8616)

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. (CVE-2020-8617)

Update instructions

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

Ubuntu 20.04 LTS
bind9 - 1:9.16.1-0ubuntu2.1
Ubuntu 19.10
bind9 - 1:9.11.5.P4+dfsg-5.1ubuntu2.2
Ubuntu 18.04 LTS
bind9 - 1:9.11.3+dfsg-1ubuntu1.12
Ubuntu 16.04 LTS
bind9 - 1:9.10.3.dfsg.P4-8ubuntu1.16

To update your system, please follow these instructions:

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