=========================================================================Ubuntu Security Notice USN-3769-1
September 20, 2018

bind9 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

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

Summary:

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

Software Description:
- bind9: Internet Domain Name Server

Details:

It was discovered that Bind incorrectly handled the deny-answer-aliases
feature. If this feature is enabled, a remote attacker could use this issue
to cause Bind to crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 18.04 LTS:
  bind9                           1:9.11.3+dfsg-1ubuntu1.2

Ubuntu 16.04 LTS:
  bind9                           1:9.10.3.dfsg.P4-8ubuntu1.11

Ubuntu 14.04 LTS:
  bind9                           1:9.9.5.dfsg-3ubuntu0.18

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

References:
  https://ubuntu.com/security/notices/USN-3769-1
  CVE-2018-5740

Package Information:
  https://launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/bind9/1:9.10.3.dfsg.P4-8ubuntu1.11
  https://launchpad.net/ubuntu/+source/bind9/1:9.9.5.dfsg-3ubuntu0.18