USN-3956-1: Bind vulnerability

25 April 2019

bind9 vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


Bind could be made to consume resources if it received specially crafted network traffic.

Software Description

  • bind9 - Internet Domain Name Server


It was discovered that Bind incorrectly handled limiting the number of simultaneous TCP clients. A remote attacker could possibly use this issue to cause Bind to consume resources, leading to a denial of service.

Update instructions

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

Ubuntu 19.04
bind9 - 1:9.11.5.P1+dfsg-1ubuntu2.3
Ubuntu 18.10
bind9 - 1:9.11.4+dfsg-3ubuntu5.3
Ubuntu 18.04 LTS
bind9 - 1:9.11.3+dfsg-1ubuntu1.7
Ubuntu 16.04 LTS
bind9 - 1:9.10.3.dfsg.P4-8ubuntu1.14

To update your system, please follow these instructions:

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