USN-3956-2: Bind vulnerability

9 May 2019

bind9 vulnerability

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

  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM


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

Software Description

  • bind9 - Internet Domain Name Server


USN-3956-1 fixed a vulnerability in Bind. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

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 14.04 ESM
bind9 - 1:9.9.5.dfsg-3ubuntu0.19+esm1
Ubuntu 12.04 ESM
bind9 - 1:9.8.1.dfsg.P1-4ubuntu0.28

To update your system, please follow these instructions:

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